Article
Engineering, Electrical & Electronic
Mukesh Kumar, A. Kumar, R. K. Goyal, S. Sharma
Summary: Poly(ether-ketone) (PEK) based composites filled with up to 50 wt% fly ash (FA) powder were successfully fabricated via ball milling and hot pressing. The SEM analysis showed that the FA particles were uniformly distributed in the PEK matrix with a good interfacial bonding. The addition of FA significantly decreased the coefficient of thermal expansion by approximately 33.6% and increased the thermal conductivity by over 50% compared to neat PEK. The 50 wt% FA reinforced PEK composite exhibited the best overall performance, with comparable dielectric constant and dissipation factor to commercial FR-4 and thermal stability above 550 degrees C.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Polymer Science
Wenxia Sima, Xinyu Tang, Potao Sun, Ming Yang, Tao Yuan, Zeyan Shi, Haoyue Yang, Qin Deng
Summary: Despite the proposal of nanodielectrics in 1994, the impact of nano- and microstructures on composite performance is still not completely understood. In this study, the self-excited fluorescence of a microscale-damaged microchannel inside a composite was observed under the influence of an electric field. Furthermore, in situ imaging of the internal microstructures and discharge channels in the composite was conducted using external laser excitation.
Article
Polymer Science
Seira Morimune-Moriya, Keiya Obara, Marika Fuseya, Masashi Katanosaka
Summary: Polymer nanocomposites based on PI and ND were prepared by in-situ polymerization, with highly dispersed ND in PI matrix achieving excellent mechanical and thermal properties at very low ND content. The properties were significantly enhanced by the addition of only a small amount of ND.
Article
Polymer Science
Seira Morimune-Moriya, Takashi Nishino
Summary: Strong, tough, transparent, and highly heat-resistant nanocomposites made of nanodiamond (ND) and poly (methyl methacrylate) (PMMA) were prepared via a simple water-based process. The nanocomposites exhibited a remarkable increase in mechanical and thermal properties at low ND contents, with an improvement in Young's modulus, tensile strength, and toughness. The incorporation of ND also led to higher thermal degradation temperature and glass transition temperature, exceeding the theoretical values and demonstrating the successful impartation of excellent properties of ND to the nanocomposites.
Article
Engineering, Manufacturing
Yifan He, Fengxia Kuang, Zhanxun Che, Fangyuan Sun, Kun Zheng, Jingnan Zhang, Xinyu Cao, Yongmei Ma
Summary: BNNS/epoxy resin composite films with high out-of-plane thermal conductivity were successfully prepared by optimizing the magnetic field strength. Magnetically responsive BNNSs were prepared by loading Fe3O4 nanoparticles, and well-aligned BNNS/EP composites were achieved by controlling the magnetic field intensity and direction. The well-oriented BNNSs resulted in significantly improved thermal conductivity.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Polymer Science
Yafei Wang, Zhicheng Chang, Ke Gao, Ziwei Li, Guanyi Hou, Jun Liu, Liqun Zhang
Summary: The study found that MoS2 and BN fillers enhance thermal conductivity with increasing sizes but have different effects on the composites; the introduction of hybrid BN/MoS2 filler effectively reduces voids in the composites and increases thermal conductivity; there exists an optimal loading ratio of the two fillers, reaching the maximum thermal conductivity of the composite.
Article
Polymer Science
Hao Ma, Krystelle Lionti, Teddie P. Magbitang, John Gaskins, Patrick E. Hopkins, Scott T. Huxtable, Zhiting Tian
Summary: Molecularly confined polymer fillers in nanopores were found to enhance the thermal conductivity of polymer nanocomposites by providing superior mechanical properties. This enhancement is attributed to the better aligned and less entangled chains in the confined phase, resulting in reduced chain-chain phonon scatterings. This work offers essential insights for multifunctional thermal and mechanical applications of polymer nanocomposites.
Article
Chemistry, Multidisciplinary
Biao Zuo, Cheng Li, Quanyin Xu, Katelyn Randazzo, Naisheng Jiang, Xinping Wang, Rodney D. Priestley
Summary: This study demonstrates that polymer brushes with ultrahigh grafting density exhibit significantly improved thermal stability, overcoming confinement and interfacial effects to control thin-film material properties. The dense packing and molecular ordering in the amorphous state of ultradense brushes prepared by surface-initiated atom transfer radical polymerization in combination with a self-assembled monolayer of initiators play a crucial role in enhancing the thermal stability of polymer films.
Article
Polymer Science
Igor N. Shardakov, Aleksandr N. Trufanov
Summary: This paper proposes an approach to study the strain response of polymer film samples under various temperature effects and notes that the thermal expansion coefficients for these polymers depend significantly on both temperature and its change rate. The method developed in the study can be used for mathematical modeling of thermomechanical processes arising during the operation of products made of polymers.
Article
Materials Science, Multidisciplinary
Xing Zhou, Jingrui Deng, Changqing Fang, Wanqing Lei, Yonghua Song, Zisen Zhang, Zhigang Huang, Yan Li
Summary: This study prepared carbon nanotubes/polylactic acid composites using 3D printing method, and found that the orientation of CNTs affected the properties of the composites. The 3D printing process was beneficial for improving the electrical conductivity and mechanical properties of the composites.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Kavita Ghosh, L. Gaikwad, R. K. Kalal, P. A. Kulkarni, Arvind Kumar, Shaibal Banerjee, Manoj Gupta
Summary: In this study, organically modified Montmorillonite clay Cloisite 30B with polar moiety was used to prepare Hydroxyl terminated polybutadiene-clay nanocomposites, which showed promising functional utility as inhibitor materials in composite propellants. The nanocomposites containing Cloisite 30B exhibited desirable properties such as lower ablation rate and density, higher strain capability, and reduced smoke generation tendency compared to conventional fillers like Sb2O3. Furthermore, the interfacial bonding of HCN based inhibitors with Cloisite 30B filler was comparable or even superior to conventional inhibitors.
DEFENCE TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Alessandro Di Pierro, Bohayra Mortazavi, Alberto Fina
Summary: The study investigates the use of molecular junctions to enhance thermal conductivity in polymer nanocomposites, finding that short and conformationally rigid molecular junctions are most effective in reducing thermal resistance and promoting thermal transport efficiency.
Article
Biochemistry & Molecular Biology
Qi Chen, Rafael Auras, Milena Corredig, Jacob Judas Kain Kirkensgaard, Aref Mamakhel, Ilke Uysal-Unalan
Summary: In this study, the crystallization behavior of PLLA/PDLA blends was modified by the addition of low loading of layered double hydroxide (LDH), resulting in additional rigid amorphous fraction (RAF) formation. The role of LDH in facilitating the pairing of PLLA and PDLA and influencing the chain behavior of SC-PLA during crystallization was highlighted. The mechanism presented in this study can be applied to other filler-type nucleator systems.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Materials Science, Multidisciplinary
T. Dorbani, M. C. Bouleklab, A. Settar, K. Chetehouna, Y. Naoui, S. Revo, S. Hamamda
Summary: This study investigates the thermodynamic and structural behaviors of an aluminium-based nanocomposite reinforced by Multi-walled Carbon Nanotubes (MWCNT). The results show that the introduction of MWCNTs completely changes the behavior of the material in terms of heat capacity, linear expansion, and structural properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Manufacturing
Yaqi Geng, Ran Cao, Mugaanire Tendo Innocent, Zexu Hu, Liping Zhu, Le Wang, Hengxue Xiang, Meifang Zhu
Summary: Temperature sensors are important for personal health management, but it is a challenge to create high-sensitivity sensors that can adapt to different temperature ranges. This study successfully synthesized an acrylate copolymer with adjustable temperature response and used it to construct a highly sensitive wearable body temperature sensor. The sensor showed a sensitivity of 12.5% within a 0.5 degree Celsius range around body temperature and remained stable after 200 heating cycles. It can be connected to LEDs for visualization, making it promising for smart wearable electronics.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
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.