Article
Polymer Science
Luqian Dong, Yuting Xue, Haizhou Huang, Dantong Shen, Weiwei Gao, Fang Xu, Yunxuan Weng, Yang Zhang
Summary: An eco-friendly P-N-containing flame retardant, SPDP, was synthesized based on soybean protein for PLA by Mannich reaction, significantly improving the flame retardant efficiency of protein-based flame retardants. High-efficiency flame-retardant PLA/SPDP composites were successfully prepared, with the addition of 7wt.% SPDP resulting in increased LOI value and achieving V0 rating in UL-94 vertical burning tests. The composites also showed decreased HRR and THR. The results of various analyses indicated that SPDP increased condensed components and decreased flammable gaseous compounds, leading to positive effects on char formation of PLA.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Chemistry, Multidisciplinary
Daohai Zhang, Meng Pei, Ke Wei, Fang Tan, Chengtao Gao, Dongmei Bao, Shuhao Qin
Summary: In this study, a DOPO derivative-conjugated flame retardant P-PPD-Ph with two hydroxyl groups was synthesized and used to prepare polylactic acid (PLA) conjugated flame-retardant composites. The flame-retardant properties of the composites were investigated using limiting oxygen index (LOI) and vertical burning test (UL94). It was found that the addition of 5 wt% conjugated flame retardant achieved a V-0 rating, indicating excellent flame retardancy.
FRONTIERS IN CHEMISTRY
(2022)
Article
Engineering, Environmental
Dequan Han, Hui Wang, Tingting Lu, Luya Cao, Yufei Dai, Hongzhang Cao, Xiaoli Yu
Summary: Polylactic acid (PLA) is a bioplastic that can be derived from biomass resources and has the potential to replace petroleum-based polymer materials. However, PLA is flammable and the droplet phenomenon during combustion is a disadvantage. In this study, a core-shell flame retardant was prepared using polyacrylamide (PAM)/sodium alginate (SA) coated ammonium polyphosphate (APP) and blended with PLA to improve its flame retardancy and toughness.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2022)
Article
Engineering, Environmental
Lubin Liu, Yue Xu, Yu Pan, Miaojun Xu, Yifan Di, Bin Li
Summary: NTPA has successfully enhanced the flame retardancy and crystallization rate of PLA composites, while maintaining their transparency and mechanical properties, showing great potential for advanced optoelectronic devices.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Biochemistry & Molecular Biology
Xiao-Mei Yang, Shuang Qiu, Abdulmalik Yusuf, Jun Sun, Zhongjie Zhai, Junhuan Zhao, Guang-Zhong Yin
Summary: The large-scale application of ecofriendly polymeric materials is a key focus of scientific research. Mechanical properties and fire safety are critical considerations for biopolymers. This study reviews the recent research on flame retardant functionalization and mechanical reinforcement of polylactic acid (PLA). It classifies PLA based on the type of flame retardant strategy employed and summarizes the latest advances in the fields of flame retardancy and mechanical reinforcement of PLA.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Polymer Science
Kai Xu, Chentao Yan, Chunlin Du, Yue Xu, Bin Li, Lubin Liu
Summary: This study focuses on improving the flame retardancy and toughness of polylactic acid (PLA) using a simple method. PLA/MKF/NTPA biocomposites were prepared by incorporating alkali-treated kapok fiber (MKF) and phosphorus-nitrogenous flame retardant (NTPA) into the PLA matrix. The biocomposites achieved a UL-94 V-0 rating and improved impact strength compared to pure PLA. The addition of NTPA acted as a gas-phase flame retardant and condensed-phase barrier, while MKF enhanced toughness. This work is important for expanding the application range of PLA biocomposites.
Article
Polymer Science
Jian Xu, Junhao Fei, Tao Tang, Meng Ma, Yanqin Shi, Huiwen He, Si Chen, Xu Wang
Summary: In this paper, a bio-based flame retardant PA-AR is synthesized, which endows PLA with good flame retardant and crystallization properties, and at the same time promotes the biodegradability of PLA. The addition of 1 wt% PA-AR significantly improves the LOI value, reaching UL-94 V-0 level, and increases the crystallinity and tensile strength of PLA. Moreover, PA-AR greatly enhances the degradation performance of PLA under specific biological conditions, providing a novel method to obtain completely biodegradable flame retardant composites.
Article
Polymer Science
Qingxia Xue, Quan Wu, Yuan Yao, Xinjian Li, Jun Sun, Xiaoyu Gu, Weiguo Song, Fang Yan, Sheng Zhang
Summary: An efficient bio-safe cyclophosphazene flame retardant HCPO was synthesized and incorporated into PLA to enhance fire safety. Results showed that HCPO significantly improved the flame retardancy of PLA composites.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2021)
Article
Thermodynamics
Xinxin Wang, Wentao He, Lijuan Long, Shaowen Huang, Shuhao Qin, Guomin Xu
Summary: The study successfully improved the flame resistance of PLA by incorporating a phosphorus and nitrogen-containing DOPO derivative (DOPO-NH2), achieving an LOI value of 26% with just 5% mass of DOPO-NH2 added. The hydrogen bonds formed between DOPO-NH2 and the PLA matrix maintained the mechanical properties of the composite.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Review
Chemistry, Applied
Meng Liao, Haojie Chen, Liumi Deng, Xuejing Wei, Zixuan Zou, Hua Wang, Shaohua Chen, Zongmin Zhu
Summary: By designing and synthesizing a novel integrated intumescent flame retardant (TPAPP), the flame retardancy and UV resistance of Polylactic acid (PLA) composites were effectively enhanced. The addition of TPAPP significantly increased the ultimate oxygen index and flame retardant rating of the PLA composites, while reducing the heat release rate and smoke emission.
REACTIVE & FUNCTIONAL POLYMERS
(2023)
Review
Chemistry, Physical
Lesego Tabea Temane, Jonathan Tersur Orasugh, Suprakas Sinha Ray
Summary: Poly(lactic acid) or polylactide (PLA) is a potential replacement for petrochemically made plastics, but its flammability and propensity to flow in a fire have limited its use. Research has focused on developing new flame-retardants for PLA, with a recent emphasis on two-dimensional nanosystems and their composites. The addition of 2D nanoparticles reduces the flammability of PLA by forming a barrier layer that blocks the transfer of volatile gases, oxygen, and heat.
Article
Polymer Science
Yadong Wang, Li Ma, Hua Wang, Chunzu Cheng, Xianze Yin, Zongmin Zhu
Summary: In this study, two different types of bio-based charring agents (CFU, CVA) were prepared using chitosan derived from corn starch and sugarcane, as well as bio-based vanillin and furfural. These charring agents, along with ammonium polyphosphate (APP), were incorporated into PLA to create flame-retardant and high-performance composite materials. The addition of CFU (or CVA) and APP greatly improved the fire resistance and mechanical properties of the PLA composites, while reducing heat and smoke releases.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Engineering, Chemical
Yue Xu, Yong Qiu, Chentao Yan, Lubin Liu, Miaojun Xu, Baoti Xu, Bin Li
Summary: A multifunctional additive (PDPO) was successfully synthesized and used to fabricate flame retardant PLA biocomposites, improving their crystallization rate and flame retardant performance. The introduction of PDPO effectively inhibited the spread of fire, with minimal impact on mechanical properties, showing broad application prospects in fields such as electronic devices, automobiles, and 3D printing materials.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Polymer Science
Yuanyuan Zhan, Xujuan Wu, Shasha Wang, Bihe Yuan, Quan Fang, Sheng Shang, Chengran Cao, Gongqing Chen
Summary: A bio-based flame retardant (ATMP-NA-Fe) was successfully synthesized and showed synergistic effects with ammonium polyphosphate (APP) in improving the flame retardant performance of polylactic acid (PLA). The mechanism of flame retardancy for the PLA/APP/ATMP-NA-Fe composites was proposed based on analysis of condensed and gas phase products.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Engineering, Multidisciplinary
Yongqian Shi, Zixiao Wang, Chuan Liu, Hengrui Wang, Jin Guo, Libi Fu, Yuezhan Feng, Liancong Wang, Fuqiang Yang, Minghua Liu
Summary: As a biodegradable polymeric material, polylactic acid (PLA) has various applications, but its high flammability limits its potential use. Recent research has focused on using modified titanium carbide nanosheets and silicon microencapsulated ammonium polyphosphate to improve the fire safety of PLA composites. The results showed significant improvement in flame retardancy and reduction in toxic gases.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Polymer Science
Qingshan Yang, Jun Wang, Shuang Yang, Siqi Huo, Pingan Song, Zhengping Fang, Hao Wang
Summary: A phosphorus-containing aliphatic amine curing agent (DPT) was synthesized and used as a flame-retardant curing agent for epoxy resin systems. The introduction of phosphorus-based group reduced the curing activity. The DPT-containing EP systems exhibited improved flame retardancy and smoke suppression due to the bi-phase flame-retardant action of DPT.
JOURNAL OF POLYMER RESEARCH
(2023)
Article
Polymer Science
Guofeng Ye, Siqi Huo, Cheng Wang, Pingan Song, Zhengping Fang, Hao Wang, Zhitian Liu
Summary: In this study, a novel hyperbranched, P-P synergetic, bio-based flame retardant (DIT) was synthesized, which could enhance the fire safety, mechanical properties, thermal resistance and transparency of epoxy resins. The addition of 2 wt% DIT enabled the EP/2DIT sample to achieve a UL-94 V-0 rating and a limiting oxygen index (LOI) of 36.6%. DIT demonstrated durable flame retardancy and improved the elongation at break, tensile strength, flexural strength and impact strength of the EP/2DIT sample. The high efficiency of DIT as a flame retardant was attributed to the synergism between DOPO and THPO.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Polymer Science
Di Zhang, Weihong Cao, Zhenghong Guo, Hongqiang Yan, Zhengping Fang, Peng Chen, Juan Li
Summary: Researchers have developed a flame-retardant polymer called vitrimer by incorporating an epoxy monomer with a phosphonate group. By adding specific acid monomers, they were able to regulate the structure and properties of the polymer. The vitrimer showed excellent flame retardancy, recyclability, and shape memory performance.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Engineering, Environmental
Miaohong Yao, Linghui Liu, Changchang Ma, Huan Zhang, Yan Zhang, Ruiyin Song, Zhengping Fang, Pingan Song
Summary: In this study, a bio-based sol solution was designed and prepared to improve the flame retardancy and crystallinity of polylactide (PLA), and enhance its degradability in water. The addition of a bio-based flame retardant and polyethylene glycol (PEG) resulted in PLA achieving UL94 V-0 flame retardant rating and a limited oxygen index (LOI) value of 29.4%. Furthermore, the sol solution accelerated the degradation rate of PLA in water. The study also found that degraded PLA and the flame retardant were released as oligomers during the hydrolysis process.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Polymer Science
Yao Xu, Bingtao Wang, Zhenghong Guo, Zhengping Fang, Peng Chen, Juan Li
Summary: A bio-based copolymer (TDDL) containing lysine, dopamine, triazine was synthesized and used as a charring agent, while ammonium polyphosphate (APP) served as an acid source to improve the flame retardancy of thermoplastic polyurethane (TPU). Tests showed that TPU blends with 8 wt% APP achieved a UL-94 V0 rating and a LOI value of 30.0 vol%, while TPU blends containing 6 wt% APP/TDDL exhibited a UL-94 V0 rating and a LOI of 29.6 vol%, indicating a synergistic effect between TDDL and APP. In addition, TDDL reduced the heat release rate of TPU/APP blend, promoted the formation of a char layer, and suppressed combustible gas and smoke release. Moreover, TPU blends demonstrated better modulus and elongation at break compared to TPU.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Chemistry, Applied
Cheng Wang, Siqi Huo, Guofeng Ye, Zhengping Fang, Hao Wang, Zhitian Liu
Summary: Novel ZrP-D nanosheets were synthesized and used in intumescent fire-retardant coatings (IFRCs), showing improved fire resistance, smoke suppression, thermal stability and water tolerance. The introduction of 3wt% ZrP-D reduced the backside temperature of IFRC by approximately 43.4% and significantly reduced peak heat release rate, total heat release and total smoke release. The IFRC also exhibited enhanced thermal stability and water tolerance with char yield reaching 64% and water contact angle of 82.7 degrees. This study provides a rational design for creating IFRCs with smoke suppression and water resistance, which has promising industrial applications.
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2023)
Article
Polymer Science
Bingtao Wang, Runfeng Ye, Zhenghong Guo, Juan Li, Zhengping Fang, Shiya Ran
Summary: CeHPP was synthesized and introduced into PC/DBDPO to improve the flame retardancy. The flame retardancy of PC/DBDPO/Sb2O3 and PC/DBDPO/CeHPP composites were compared. CeHPP showed a better synergistic effect with DBDPO than Sb2O3. The char-barrier effect of CeHPP transferred the free-radical-trapping effect of BFRs from the gaseous phase to the condensed phase, inhibiting the release and spread of gases and smoke.
JOURNAL OF POLYMER RESEARCH
(2023)
Article
Chemistry, Applied
Jinhao Sun, Di Zhang, Yong Yang, Zhenghong Guo, Zhengping Fang, Peng Chen, Juan Li
Summary: A bio-based flame retardant TFD was synthesized and used to improve the flame retardancy of polyamide 6 (PA6). A bio-based chain extender EDPDO was utilized to regulate the mechanical properties of PA6. A combination of 8 wt% TFD and 1 wt% EDPDO in PA6 achieved a UL-94 V0 rating, with improved mechanical properties. The improved flame retardancy in the UL-94 test was mainly attributed to the melting-away effect, while poor adhesion among char particles resulted in the formation of smoke.
REACTIVE & FUNCTIONAL POLYMERS
(2023)
Article
Chemistry, Multidisciplinary
Junhua Ding, Jinggang Wang, Weihong Cao, Huajun Zheng, Zhenghong Guo, Zhengping Fang, Peng Chen, Juan Li
Summary: A bio-based phosphonate, DPGE, was synthesized and used to enhance the flame retardancy of PEFT20. PEFT20 containing 8 wt% DPGE exhibited excellent flame retardant properties with a UL-94 V0 rating and a limiting oxygen index of 29.8 vol %. The mechanical performance of PEFT20/DPGE was regulated by incorporating TGIC, which improved the flexural and impact strengths of the blend but also counteracted the melting-away effect caused by DPGE, resulting in a decrease in flame retardancy.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Li Zhang, Qian Zhang, Weihong Cao, Zhenghong Guo, Zhengping Fang, Juan Li, Peng Chen
Summary: A phosphorous-silicon hybrid microsphere (SiP-M) was synthesized using a phosphorous-silicon precursor, and it was employed to enhance the flame retardancy of poly (butylene adipate-co-terephthalate) (PBAT). The addition of SiP-M reduced the flammability of PBAT, and the use of a coupling agent KH560 improved the interface adhesion between PBAT and SiP-M, enhancing the tensile strength and elongation at the break of PBAT blends. This work provides an efficient method for preparing flame retardant PBAT without compromising its mechanical properties.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Polymer Science
Juan Chai, Wei Feng, Hongqiang Yan, Yan Xia, Yong Yang, Bingtao Wang, Juan Li, Zhengping Fang, Zhenghong Guo
Summary: A lamellar cerium phenylphosphonate (CeHPP) was synthesized through a reflux method and combined with aluminum diethylphosphinate (ADP) to prepare flame retardant carbon fiber reinforced polyamide 6 (PA6/CF) composites, achieving improved flame retardancy and elimination of the candlewick effect caused by CFs.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Yao Xu, Bingtao Wang, Zhenghong Guo, Zhengping Fang, Juan Li, Peng Chen
Summary: A dopamine-triazine compound (TTD) was synthesized using dopamine and cyanuric chloride to improve the flame retardancy of thermoplastic polyurethane (TPU). Combining TTD and ammonium polyphosphate (APP) also enhanced the mechanical properties of TPU blends. TPU containing 8 wt% APP achieved a UL-94 V0 rating and a limiting oxygen index (LOI) of 30.0 vol%. When APP and TTD were combined at a ratio of 7/1 (wt%/wt%), TPU only required 5 wt% flame retardant to achieve a UL-94 V0 rating, demonstrating a synergistic effect between APP and TTD.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2023)
Article
Chemistry, Applied
Jinhao Sun, Di Zhang, Bingtao Wang, Yan Xia, Yanhui Zhang, Zhenghong Guo, Zhengping Fang, Juan Li, Peng Chen
Summary: A star-shaped flame retardant containing Si/P/B (SiFAD) was synthesized to enhance the performance of epoxy (EP) in terms of flame retardancy, toughness, and transparency. The addition of 6 wt% SiFAD to EP resulted in UL-94 V0 rating and a limiting oxygen index (LOI) of 34.7 vol%. SiFAD promoted early degradation of EP, increased char formation at high temperature, and improved flame retardancy through both gas and condensed phase actions. Tensile and impact strength of EP were enhanced, with EP containing 4 wt% SiFAD showing 139% higher impact strength (15.8 kJ/m2) compared to pure EP. Furthermore, SiFAD facilitated microphase separation in EP composites, enabling good transparency.
REACTIVE & FUNCTIONAL POLYMERS
(2023)
Article
Materials Science, Multidisciplinary
Bingtao Wang, Yu Zhang, Juan Li, Zhengping Fang, Zhenghong Guo, Shiya Ran
Summary: In this study, a flame retardant containing sulfonate and phosphazene moieties (HSPP) was synthesized and applied to PC to improve flame retardancy properties without sacrificing transparency. The results showed that a low loading of HSPP (0.04wt%) could significantly improve the flame retardancy of PC, achieving a 30.4% increase in LOI, V-0 rating in UL-94, 25% reduction in THR, and 45% reduction in COY in the cone calorimetry test. The flame retardancy mechanism was attributed to the synergistic carbonization of sulfonates and phosphazene moieties from HSPP and the enhanced barrier effect of PC residual char layer with high graphitization and integrity quality. The transparency and mechanical properties of the PC composite were well maintained due to the low-loading of HSPP.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Polymer Science
Yuanzhang Jiang, Xuyi Wang, Yanting Han, Dakai Gong, Yingchun Gu, Lin Tan
Summary: In this study, FeCl3 and poly(acrylic acid) (PAA) were doped into waterborne polyurethanes (WPUs) to create multifunctional materials with self-healing and antimicrobial properties. WPU/Fe/PAA-5.5, containing 5.5 wt % PAA, exhibited excellent mechanical properties, strong self-healing capabilities, and an impressive antimicrobial rate of over 90%. These supramolecular films were also highly recyclable through hot-pressing.
Article
Polymer Science
Longyu Tian, Min Wang, Guangming Liao, Baoliang Liu, Sujuan Zhang, Yucheng Sun, Zhen Meng, Jintao Zhang, Zaijun Lu
Summary: Two kinds of benzoxazine monomers were synthesized and used to prepare polybenzoxazine anion exchange membranes (AEMs) with quaternary ammonium functionalization. The LQPBZ AEM exhibited better ion conductivity and alkaline stability.
Article
Polymer Science
Claire A. Lemarchand
Summary: This study investigates the shock behavior of three different polymers through molecular dynamics simulations. The results reveal specificities in the shock behavior of polymers, including deviations from the linear relation between shock velocity and particle velocity, as well as differences in shear stress relaxation behind the shock front. It is found that the deviation of the Hugoniot locus is related to the change in the relative contribution of bonding and non-bonding potential energies, while polymers with higher glass transition temperatures exhibit slower shear stress relaxation.
Article
Polymer Science
Zengquan Liu, Xiaochun Yin, He Zhang, Shuo Gao, Qinglin Kuang, Yanhong Feng
Summary: A powder solid-state extension (PSSE) technology was proposed to address the high melt viscosity issue of UHMWPE. By uniaxial extension and sintering in the solid state, a highly self-reinforced material was prepared. X-ray diffraction and scattering techniques were used to study the structural evolution during the PSSE process, and a solid-phase induced transformation model was established.
Article
Polymer Science
Zhike Li, Anyu Luo, Rui Zhou, Xin Li, Haiyan Li
Summary: A novel high temperature resistance IL@SiO2 nanocapsules were successfully prepared and their friction and wear properties in PA6 composites were studied. The addition of IL@SiO2 nanocapsules reduced the friction coefficient and wear rate without affecting the mechanical properties of PA6. The synergy between the IL core and SiO2 wall in the nanocapsules improved the self-lubricating performance of the PA6 composites.
Article
Polymer Science
Xin Liu, Xuhong Guo, Qi Liao
Summary: In this study, an algorithm for accurately estimating viscosity is developed using molecular dynamics simulations and the Green-Kubo formula. This algorithm can be applied to complex systems with long correlations, such as macromolecular and biological simulation systems.
Article
Polymer Science
Hao Pu, Yun-Lei Hou, Jing -Zhou Chen, Dong -Lin Zhao
Summary: The use of modified graphene improves the interfacial adherence of carbon fibers to epoxy resin, resulting in enhanced interfacial and bending properties of CF and matrix in CF/EP composites, as well as increased interlaminar shear strength and flexural strength.
Article
Polymer Science
Wei-Chung Ke, Jin-Wei Lin, Manohar Reddy Busireddy, Yueh-Hsing Lee, Jiun-Tai Chen, Chain-Shu Hsu
Summary: This study introduces a crosslinkable monomer, TAIC, to synthesize three crosslinked polyimide films, which exhibit improved thermal, mechanical, and dielectric properties. The introduction of TAIC enhances the tensile strength, reduces the dielectric constant and dielectric loss, and decreases the coefficient of thermal expansion of the polyimide films.
Article
Polymer Science
Alex Kwasi Kumi, Ruiling Fan, Ye Chen, Yumei Zhang
Summary: The difference in leaching of amylopectin from cellulose/amylopectin/1-butyl-3-methylimidazolium chloride ([Bmim][Cl]) blends during regeneration in water and aqueous ethanol has been studied. Molecular dynamics simulations showed that the dissolution and regeneration mechanisms of amylopectin in [Bmim][Cl] are similar to cellulose in ionic liquids. Water regeneration leads to weak electrostatic interactions, resulting in high leaching of amylopectin. In contrast, ethanol-water interactions enhance electrostatic interactions among amylopectin chains, limiting amylopectin leaching in aqueous ethanol.
Article
Polymer Science
Xi Zeng, Junwei Zhou, Junbiao Peng, Chunsheng Zhang, Danling Wang, Yihu Song, Qiang Zheng
Summary: This study utilizes an oligomer deep eutectic solvent (DES) based on polyethylene glycol to regulate the vulcanization kinetics of rubber. The results show that the DES can accelerate vulcanization at low temperatures without affecting the crosslinking density and Mullins effect.
Article
Polymer Science
Qianqian Yue, Yongfei Peng, Xingjian Liu, Aihua He, Huarong Nie
Summary: The addition of metal deactivators can effectively suppress the aging of TBIR, prolong its lifespan, and have no negative effects on its physical and processing properties. These research findings are of great importance for improving the stability and aging resistance of polymers.
Article
Polymer Science
J. Gomez-Caturla, J. Ivorra-Martinez, R. Tejada-Oliveros, V Moreno, D. Garcia-Garcia, R. Balart
Summary: This work focuses on the development of environmentally friendly PLA formulations by using different esters derived from geraniol as plasticizers. The results show that these esters have good compatibility with PLA, and they can effectively enhance the elongation and plasticity of PLA, reduce its glass transition temperature, and slightly improve its water absorption capabilities.
Article
Polymer Science
Dandan Li, Zhaohui Lu, Zhao Ke, Ke Xu, Fengna Dai, Youhai Yu, Guangtao Qian, Chunhai Chen
Summary: In this study, cross-linked PI aerogel membranes with low dielectric constant and high moisture resistance were prepared by co-polymerization and scraping coating technology. The incorporation of fluorinated blocks and benzimidazole ring structures resulted in novel PI aerogel membranes with fascinating dielectric properties and outstanding moisture resistance.
Article
Polymer Science
Zhaoyang Chu, Qing Zhang, Haihua Luo, Han Zhou, Fapei Zhang, Wei Chen, Wenhua Zhang
Summary: Multi-physical fields solution processing strategy is a universal and facile method for preparing various conjugated polymer films and high-performance devices. In this study, we employed a combined microfluidic flow and ultrasonication strategy (FU) for processing CP solutions, and found a pronounced synergetic effect in promoting the pre-ordering of chains in solution. The conformation order and anisotropy of the solution were revealed through various characterizations. A non-classical nucleation model for polymer crystallization in non-equilibrium solution processing was confirmed. The roles of microfluidic flow and ultrasonication in chain aggregation and crystallization were addressed through multi-physical simulations. Compared to pristine solutions, the FU strategy showed improved solution anisotropy and crystallization kinetics, resulting in higher crystallinity in films and increased mobilities in OFET devices. The FU processing strategy provides a universal approach for regulating chain conformation and aggregation in conjugated polymer solutions.
