Article
Chemistry, Multidisciplinary
Won-Jong Choi, Seul-Yi Lee, Soo-Jin Park
Summary: By using ambient plasma treatment, boron nitride nanosheets (BNNS) can be prepared as fillers in epoxy nanocomposites with high thermal conductivity and fracture toughness.
Article
Materials Science, Composites
Hyeseong Lee, Mi Na Kim, Han Gyeol Jang, Ji-un Jang, Jaewoo Kim, Seong Yun Kim
Summary: The aggregation of nano-carbon fillers in composites due to van der Waals forces hinders their excellent conductive properties. To overcome this, a dispersion strategy using phenyl glycidyl ether (PGE) as a non-covalent functionalization agent was proposed. The composites filled with PGE-treated nano-carbon fillers showed significantly improved electrical and thermal conductivities.
COMPOSITES COMMUNICATIONS
(2022)
Article
Engineering, Manufacturing
Fubin Luo, Shuguang Yang, Pinping Yan, Hongzhou Li, Baoquan Huang, Qingrong Qian, Qinghua Chen
Summary: Liquid Crystal Polymer (LCP) / hexagonal boron nitride (BN) composites with highly aligned nematic domains and orderly arrangement of BN were manufactured using 3D printing. The composites exhibited high thermal conductivity.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Zhongyao Zhang, Jennifer L. Wilson, Brian R. Kitt, David W. Flaherty
Summary: Reactive plasma discharges, specifically low-pressure O-2 plasma treatments, have been shown to modify the morphology and chemistry of composite surfaces, resulting in increased shear strength of carbon fiber composites by promoting mechanical interlocking and interfacial chemical bonding. These improvements are attributed to the exposure and oxidation of imide groups on the composite surfaces, leading to enhanced adhesion and covalent bond formation with epoxides in adhesives.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Chemistry, Physical
Xianwu Cao, Lutong Ge, Xiaochun Yin, Guangjian He
Summary: In this study, a BN/epoxy composite with innovative structure and high thermal conductivity was reported. By noncovalent functionalization and 3D construction, the BN/epoxy composite exhibited excellent thermal management performance. The composite achieved a high thermal conductivity, providing a new solution for improving the thermal conductivity of composites.
SURFACES AND INTERFACES
(2022)
Article
Materials Science, Composites
Dan Yang, Qungui Wei, Liyuan Yu, Yufeng Ni, Liqun Zhang
Summary: Functionalized hexagonal boron nitride platelets modified and grafted with bis-(gamma-triethoxysilylpropyl)-tetrasulfide were used to prepare BN-PCPA-Si69/NR composites with significantly improved thermal conductivity, mechanical properties, and dielectric characteristics. The composite with 30% volume content of BN-PCPA-Si69 platelets showed a 5.4-fold increase in thermal conductivity and a maximum tensile strength of 17.0 MPa.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Review
Chemistry, Multidisciplinary
Zhengfang Wang, Zijian Wu, Ling Weng, Shengbo Ge, Dawei Jiang, Mina Huang, Daniel M. Mulvihill, Qingguo Chen, Zhanhu Guo, Abdullatif Jazzar, Ximin He, Xuehua Zhang, Ben Bin Xu
Summary: Recently, there has been a strong focus on miniaturization and high integration in (micro-)electronic devices. However, excessive heat generation during operation/charging can negatively impact device performance and cause loss of life/property. Thermally conductive polymer composites, with their low density, easy processing, and low manufacturing cost, have emerged as a research hotspot to address the issue of excessive heat and have potential applications in various fields. However, the reported thermal conductivity coefficient of these composites is still below expectations, necessitating a deeper understanding of heat transfer mechanisms for the development of next-generation thermally conductive composites.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Materials Science, Composites
Yanfei Xu, Xiaojia Wang, Qing Hao
Summary: The trend towards miniaturization in electronic devices has led to unprecedented power densities but also poses a bottleneck for device performance. Polymer-based materials play a crucial role in effective cooling of electronic devices, with the potential to enhance thermal conductivity through strain-induced crystallization and high-conductivity fillers.
COMPOSITES COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Wondu Lee, Wonyoung Yang, Jooheon Kim
Summary: A novel filler surface treatment is used to produce thermally conductive composites by grafting ANF and PER onto the surface of GnP. The resulting composite exhibits exceptional properties and has the potential to enhance thermal management in electronic devices.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Wondu Lee, Wonyoung Yang, Jooheon Kim
Summary: This study fabricated a high-performance thermally conductive composite using epoxy (EP) and hybrid fillers consisting of polydopamine (PDA)-treated alumina (AO) and a porous boron nitride (BN) network with carbonized cellulose nanofibers (BNCNF). By using freeze-cast porous BN, continuous heat transfer paths were formed. Additionally, the interfacial interaction between the filler and matrix was improved by hydrogen bonding derived from the amin group on PDA-AO and hydroxyl group on BNCNF. The composite showed a high thermal conductivity (4.3 W m(-1) K-1, 2050% enhancement compared to pure EP) and improved tensile stress (80.86%). These findings indicate that the EP/BNCNF/PDA-AO composites have the potential to significantly enhance thermal management in electronic devices, making them promising for the development of thermal management systems.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Materials Science, Composites
Haibin Zhao, Zhiyong Gao, Dongjie Zhai, Guoqun Zhao
Summary: To improve the strength and stiffness of continuous carbon fiber/polyamide (PA 6) thermoplastic composites, combinational treatments of liquid phase oxidation, coupling agent, and coating were used to enhance the surface activity of CF fabric and interfacial bonding with PA 6 matrix. The results showed increased chemical activity on the CF surface and successful grafting of KH550. The tensile strength and Young's modulus of the composites were significantly improved by 21.2% and 24.1% respectively, and the retention rates of flexural strength and ILSS after damp heat aging were 66% and 67% respectively.
COMPOSITES COMMUNICATIONS
(2023)
Article
Materials Science, Composites
Patcharapon Somdee, Manauwar Ali Ansari, Kalman Marossy
Summary: In this study, flexible and rigid polyurethane/copper composites were prepared via a simple solution casting process. The dispersion and chemical bonding of the filler were investigated, and the thermal properties and mechanical properties of the composites were analyzed. The results showed that the thermal conductivity of the composites was significantly improved compared to the pure polyurethane, and the mechanical properties were also enhanced. The study suggests that copper microparticles can serve as an active filler in both flexible and rigid polyurethane matrices.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Hadis Khakbaz, Sepidar Sayyar, Stephen Beirne, Michael Heitzmann, Peter C. Innis
Summary: This study presents a binary-hybrid composite of boron nitride (BN) nanoparticles and micro-diamond (D) fillers in an elastomeric polyurethane (PU) matrix, which can be three-dimensionally printed to produce a highly flexible and self-supporting structure. The research shows that the hybrid matrix significantly enhances the mechanical properties and thermal conductivity compared to neat PU. This three-dimensional printable multiscale hybrid composite has great potential for flexible and stretchable microelectronic applications.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Polymer Science
Wondu Lee, Jooheon Kim
Summary: A new fabrication technique was employed to prepare a thermally conductive composite with enhanced thermal conductivity and insulating properties. By sintering AgNWs on AlN surface, a highly conductive 3D network was formed, reducing the operating temperature of the CPU significantly.
Article
Thermodynamics
Yunmin Liang, Biwei Liu, Bo Zhang, Zhichun Liu, Wei Liu
Summary: This study investigates the effects and mechanism of the filler surface coating strategy on the thermal conductivity of composites via synthesizing silica coated BN and incorporating it into epoxy. It was found that increasing the coating thickness or filler content would decrease the enhanced effect of the strategy on thermal conduction. Experimental results suggest that the increase of filler content leads to an increase in interfacial thermal resistance, which deteriorates the thermal conduction enhancement factor.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
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.
