Article
Materials Science, Multidisciplinary
Yuma Ueno, Hayato Nakazaki, Hina Onozaki, Shingo Tamesue
Summary: Researchers developed a growable adhesive gel system using RAFT polymerization, which can change its characteristics similar to human growth. The adhesive joint grown by RAFT polymerization showed higher adhesive strength and a function of thermal responsiveness compared to non-RAFT-polymerized adhesive joint. These growable adhesive gel systems enable long-term use of gel materials while adapting to environmental changes.
ACS APPLIED POLYMER MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Ruoyu Li, Weina Kong, Zesheng An
Summary: This Minireview discusses the key roles enzymes play in reversible deactivation radical polymerization (Enz-RDRP) and highlights their applications in surface brush fabrication, sensing, polymerization-induced self-assembly, and high-throughput synthesis. The authors also reflect on the challenges and future directions of this emerging area.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Polymer Science
Chengqiang Ding, Yuhan Yan, Yuhao Peng, Danming Wu, Hang Shen, Jiandong Zhang, Zhao Wang, Zhengbiao Zhang
Summary: In this study, a well-controlled piezoelectrically mediated reversible addition-fragmentation chain-transfer polymerization (piezoRAFT) was successfully conducted using piezoelectric ZnO nanoparticles as the mechanochemical transducer under ultrasonic agitation. The resulting polymer exhibited high end-group fidelity, low dispersity, and capacity for chain extension. The generation of alkyl radicals through electron transfer process from piezoelectric nanoparticles to alkyl bromide was confirmed by various characterization techniques.
Article
Polymer Science
Zhiying Li, Qianjin Lian, Youwei Xu, Yichuan Zhang, Pengfei Zhang, Jin Geng
Summary: A robust aggregation-induced emission luminogen photoaddition-fragmentation chain transfer (PET-RAFT) polymerization was investigated, resulting in the preparation of a variety of well-defined polymers with narrow polydispersities (D < 1.20). The use of low concentrations of a donor-acceptor (D-A) type aggregation-induced emission luminogen as a photocatalyst enabled polymerization under visible light at ambient temperature. Previous studies have mainly focused on organic solvents, with fewer investigations conducted in aqueous environments. This study successfully demonstrated the polymerization strategy in water with or without oxygen, leading to the synthesis of structure-controlled polymers. Furthermore, the fluorescence intensity of DCDPP-2TPA increased linearly with the degree of polymerization.
Article
Chemistry, Multidisciplinary
Joji Tanaka, Noel Edward Archer, Michael Jeffery Grant, Wei You
Summary: In this study, RAFT step-growth polymerization was achieved by combining RAFT and step-growth polymerization mechanisms, resulting in backbone repeat units with a pendant RAFT agent that can form molecular brush polymers in a second polymerization step. The cleavable backbone functionality allows the transformation of brushlike polymers into linear chains of uniform size under stimuli.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Engineering, Multidisciplinary
William Jordan Wright, Hilmar Koerner, Dan Rapking, Andrew Abbott, Emrah Celik
Summary: Short fiber reinforced polymer composites fabricated by direct ink writing (DW) offer design flexibility, low cost, and tailored properties. The study focuses on controlling fiber alignment in these composites using two common printing parameters: nozzle diameter and velocity ratio. It was found that printing with smaller nozzle diameters and higher velocity ratios enhances fiber alignment, resulting in improved bending stiffness and strength.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Polymer Science
Cansu Aydogan, F. Simal Aykac, Gorkem Yilmaz, Ye Qiu Chew, Atsushi Goto, Yusuf Yagci
Summary: A versatile strategy for the fabrication of block copolymers using a combination of two discrete living polymerization techniques has been reported. The strategy involves reversible complexation mediated living radical polymerization (RCMP) and photoinduced radical oxidation addition deactivation (PROAD) processes. The formation of the block copolymers was confirmed through various characterization techniques.
Article
Engineering, Manufacturing
Myoeum Kim, Jae-Won Choi
Summary: This study investigates the potential use of natural rubber as a 3D printable material by developing a printable ink using natural rubber latex, liquid rubber, sulfur, and other additives. The rheological properties, shape retention, dimensional accuracy, printability, and mechanical properties of the ink and 3D printed specimens were examined to evaluate the feasibility of using natural rubber in additive manufacturing applications.
ADDITIVE MANUFACTURING
(2021)
Article
Polymer Science
Arne Wolpers, Florian Baffie, Vincent Monteil, Franck D'Agosto
Summary: In this study, a dithiocarbamate chain transfer agent was used to synthesize statistical and diblock copolymers of ethylene and vinyl acetate, achieving various polymer compositions through good chain growth control, including linear diblock copolymers and a three-arm star copolymer.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Engineering, Chemical
Connor D. Armstrong, Liang Yue, Yulin Deng, Jerry Qi
Summary: Edible 3D printing using customized nutrition and visual appeal is achieved through the use of cellulose nanocrystals as a rheological modifier, enabling the printing of various foodstuffs such as spinach puree, tomato puree, and applesauce. This study demonstrates the effectiveness of cellulose nanocrystals in promoting shear-thinning behavior, necessary for the DIW 3D printing of self-supporting edible structures.
JOURNAL OF FOOD ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Xinxin Li, Min Lin, Hongfeng Zhang, Wenquan Ji, Yuhan Shi, Zhiyang Qi, Tianwen Fu, Qinran Li, Qiliang Deng
Summary: Epitope surface imprinted particles were synthesized to selectively recognize cytochrome c with higher recognition ability, selectivity, and reusability.
Review
Materials Science, Multidisciplinary
Daniel A. Rau, Christopher B. Williams, Michael J. Bortner
Summary: Direct Ink Write (DIW) is a material extrusion Additive Manufacturing (AM) technique that selectively extrudes material in a layer-by-layer fashion to form 3-dimensional parts. Rheological experiments are used to characterize inks for DIW printing and predict their printability. A range of rheological techniques and relationships are discussed in this review, providing valuable insights for DIW ink development.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Qianyi Wang, Feng-Yang Bai, Yinling Wang, Fushuang Niu, Yifei Zhang, Qixi Mi, Ke Hu, Xiangcheng Pan
Summary: Photoredox-mediated reversible deactivation radical polymerization (RDRP) is a precise method for synthesizing polymers, but it requires efficient photocatalysts. This study develops a catalyst based on the ion-pair inner-sphere electron transfer (IP-ISET) mechanism, and provides experimental evidence for its existence and potential application in polymerization.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Alyssa L. Troksa, Hannah V. Eshelman, Swetha Chandrasekaran, Nicholas Rodriguez, Samantha Ruelas, Eric B. Duoss, James P. Kelly, Maira R. Ceron, Patrick G. Campbell
Summary: This study developed a ceramic ink compatible with both PμSL and DIW additive manufacturing techniques, allowing for the printing of 3YZ ceramic structures with engineered macro cavities, varying wall thicknesses, and nanoporosity. The research demonstrated the feasibility of using the same ink base for multiple AM techniques through facile composition changes without the need for separate cumbersome ink development processes.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Characterization & Testing
Enric Casanova-Batlle, Antonio J. Guerra, Joaquim Ciurana
Summary: Silk fibroin (SF) has been used in medical devices due to its biodegradability, high tensile strength, and mechanical robustness. However, regenerated silk materials tend to become brittle in the dry state. This study presents an optimized process for producing regenerated SF bioink and investigates the effects of post-treatments on its mechanical properties. The results show that different post-treatments have distinct effects on the silk properties, suggesting that the molecular structure of SF can be controlled by the post-treatment process.
Review
Polymer Science
Patrick Imrie, Jianyong Jin
Summary: 4D printing is an exciting branch of additive manufacturing where structures have the ability to change with time. Recent advancements in polymer 4D printing challenge the common perception of limited shape change, showcasing a variety of effects and advanced techniques. This has broadened the horizons of polymer 4D printing beyond expectations.
JOURNAL OF POLYMER SCIENCE
(2022)
Proceedings Paper
Polymer Science
Patrick Imrie, Jianyong Jin
Summary: Living polymer networks are modified using the PET-RAFT photopolymerization method, where new monomers are inserted to change their mechanical properties. Two different RAFT agents are used to modify the parent networks, and characterization is carried out using FTIR spectroscopy and TGA. The results demonstrate that the choice of inserted monomers and RAFT agents affect the mechanical properties of the daughter networks.
MACROMOLECULAR SYMPOSIA
(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.