Article
Polymer Science
Oguzhan Oguz, Nicolas Candau, Gregory Stoclet, Eren Simsek, Cagla Kosak Soz, Emel Yilgor, Iskender Yilgor, Yusuf Z. Menceloglu
Summary: In this study, it was demonstrated that geometric confinement of the basic building blocks in sol-cast poly(urethane-urea) copolymer films can control stiffness, strength, extensibility, and toughness. Adjusting soft segment molecular weight and drying temperature can tune the severity of geometric confinement, allowing for the production of materials with different properties.
Article
Polymer Science
Xiangqian Fan, Xianming Zhai, Lei Liu, Jing Zhang, Lin Li, Jiarong Wang
Summary: This article synthesizes a crosslinked waterborne poly(urethane-urea) (WPUU) and produces waterborne polyacrylate-poly(urethane-urea) (WPUUA) hybrid emulsions through emulsion polymerization. WPUUA films have improved film-forming ability and mechanical properties compared to waterborne polyacrylate (WPA) films. The surface roughness of WPUUA films can also be adjusted by modifying the molar ratio of the raw materials.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Tangqing Cao, Qian Zhang, Liang Wang, Lu Wang, Yao Xiao, Jiahao Yao, Huaiyi Liu, Yang Ren, Jun Liang, Yunfei Xue, Xiaoyan Li
Summary: High-entropy alloys (HEAs) possess unique microstructures and chemical compositions, resulting in remarkable mechanical properties. In this study, the mechanical behaviors and deformation mechanisms of CoCrFeNi HEAs under dynamic loading were investigated through experiments and simulations. The results showed significant strain rate sensitivity and strain-hardening capability of CoCrFeNi HEAs at high strain rates. The findings shed light on the design and fabrication of HEAs with excellent dynamic mechanical properties.
Article
Chemistry, Multidisciplinary
Rui Guo, Qiang Zhang, Youshen Wu, Hongbing Chen, Yanghe Liu, Jingjing Wang, Xianglong Duan, Quan Chen, Zhishen Ge, Yanfeng Zhang
Summary: This study presents a polyurethane elastomer with unprecedented mechanical properties for in vivo application as hernia patches. The elastomer, obtained by solvent-free reaction, exhibits extremely high strength and toughness. Abundant and hierarchical hydrogen-bonding interactions hinder crystallization and promote the formation of uniformly distributed hard phase microdomains, resulting in high fracture strength, true stress, elongation-at-break, and fracture energy. 3D printed hernia patches made from this elastomer show outstanding mechanical properties, biocompatibility, and biodegradability. These robust and biodegradable elastomers have great potential for in vivo applications.
ADVANCED MATERIALS
(2023)
Article
Biochemistry & Molecular Biology
Kiran R. Adhikari, Inessa Stanishevskaya, Pablo C. Caracciolo, Gustavo A. Abraham, Vinoy Thomas
Summary: In this study, electrospun scaffolds based on a blend of PHH and PDO were characterized, showing high porosity and nanofiber structure. The mechanical properties of the blended scaffold, including elastic modulus, tensile strength, and maximum elongation, were comparable to materials currently used for soft tissue applications. This demonstrates the potential of electrospun PHH/PDO blend for cardiac patches or vascular graft applications mimicking native tissue.
Article
Chemistry, Physical
Yue Huang, Haitao Wu, Weihang Li, Zhaoyang Yuan, Qi Wu, Ruihai Li, Jinrong Wu
Summary: A new approach of sequential feeding has been developed to fabricate mechanically robust and healable poly(urethane-urea) (PUU) polymers. By adjusting the feeding ratio, the morphology and hydrogen bonds of the material can be tailored, resulting in optimal performance.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Polymer Science
Houqi Yao, Yuezhao Pang, Xin Liu, Jia Qu
Summary: The compressive responses of PVC foams with different densities were investigated under both quasi-static and high strain rate conditions. The results show that the mechanical properties of the foam materials are related to their density and are strain rate-sensitive.
Article
Polymer Science
Hui Wang, Junhuai Xu, Dongming Xing, Xiaosheng Du, Haibo Wang, Zongliang Du, Xu Cheng
Summary: A thermal-triggered self-healing polyurethane composite elastomer was fabricated using crosslinking isocyanate terminated polyurethane with amidoxime-modified silica particles. The elastomer exhibited high tensile strength, good elongation at break, excellent toughness, outstanding fracture energy, and the ability to regain its original mechanical performance and integrity after damage.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Zhen Li, Shuxiang Mei, Lu Luo, Siyuan Li, Xiaoyin Chen, Yuancheng Zhang, Wei Zhao, Xiaomeng Zhang, Ge Shi, Yanjie He, Zhe Cui, Peng Fu, Xinchang Pang, Minying Liu
Summary: This study investigates multiple and two-way reversible shape memory polymers (M/2W-SMPs) and presents a new material with quadruple shape memory effect. The material exhibits excellent performance and has potential applications in high-temperature sensors, actuators, and aerospace equipment.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Materials Science, Characterization & Testing
Junyi Zhou, Antonio Pellegrino, Vito L. Tagarielli
Summary: We propose and evaluate a new experimental technique to measure the fracture toughness of engineering materials and its sensitivity to strain rate. The method, based on a ring expansion technique, overcomes the limitations of current dynamic fracture tests and results in spatially uniform stress and strain fields prior to fracture. Experiments show an increase in material toughness with increasing strain rate.
Article
Materials Science, Multidisciplinary
Zhongqun Zhou, Yanning Zeng, Caili Yu, Quanyang Li, Faai Zhang
Summary: The study presents a design concept for a self-healing, highly stretchable, and robust poly(urethane-urea) elastomer prepared via a thiol-ene click reaction. The elastomer possesses versatile properties and high self-healing efficiency, making it potentially useful for fabricating self-healing stretchable conductive devices.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Polymer Science
Chunbo Zhang, Ricardo Arpad Perez-Camargo, Liuchun Zheng, Ying Zhao, Guoming Liu, Lei Wang, Dujin Wang
Summary: The crystallization behavior of aliphatic poly(hexamethylene carbonate)-co-poly(hexamethylene urethane) (PHCU) segmental block copolymers was studied using various methods including non-isothermal differential scanning calorimetry, successive self-nucleation and annealing, in-situ wide-angle X-ray diffraction, and in-situ Fourier transform infrared spectroscopy. The results showed linear dependence of crystallization and melting temperatures on hexamethylene urethane content in PHCU copolymers, with sequential crystallization and melting observed at different rates and a bimodal self-nucleation and annealing profile at low urethane content levels. In-situ WAXD and FTIR results confirmed the crystallization behavior of PHCU copolymers, showing a rate-dependent single crystallization of polyurethane-rich phase at high urethane content and double phases including both polyurethane- and polycarbonate-rich crystallization at low urethane content.
Article
Polymer Science
Liraz Avraham, Rajashekharayya A. Sanguramath, Orit Cohen, Luba Perry, Shulamit Levenberg, Michael S. Silverstein
Summary: This study successfully synthesized macroporous polymer monoliths based on four different polysaccharides using a template synthesis method in oil-in-water high internal phase emulsions. The nature of the polysaccharide and the polymerization catalyst significantly affected the porous structure. Cells were able to adhere to the walls and penetrate into the porous structures in amine-catalyzed monoliths.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Yifei Peng, Guohu Luo, Yongxiang Hu, Ding-Bang Xiong
Summary: The plastic deformation of metals is influenced by loading rates and nanoinclusions like graphene and carbon nanotubes have significant impact on the deformation mechanisms of metallic materials. This study provides a comprehensive understanding of the deformation behaviors of graphene/copper (Gr/Cu) submicro-laminated composites at different strain rates and temperatures. The presence of graphene inclusions enhances the deformation ability of the composites and leads to a limited decrease in strain rate sensitivity with temperature. Analysis reveals a transition from dislocation-dominated deformation to twinning-dominated deformation with increasing strain rates, facilitated by extreme loading conditions and graphene inclusions in Gr/Cu submicro-laminates.
Article
Nanoscience & Nanotechnology
Guoxian Zhang, Chunmei Li, JiaoJun Tan, Mingqi Wang, Zongxu Liu, Yafeng Ren, Ying Xue, Qiuyu Zhang
Summary: In this study, a simple and feasible method for the modification of poly(urethane-urea) (PUU) was proposed. Two different dynamic cross-linking bonds (disulfide linkages and Zn2+/imidazole coordination) were incorporated into the side chain of PUU, resulting in double cross-linking elastomers (PUU-I/Zn-S) with excellent mechanical and healing properties. The PUU-I/Zn-S elastomer exhibited high tensile stress, elongation at break, toughness, and tearing resistance, and could restore its mechanical robustness after self-healing at room temperature or higher temperatures. Furthermore, strain sensors based on PUU-I/Zn-S showed remarkable sensing capability to diverse human body motions.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Polymer Science
Preston B. McDaniel, Kenneth E. Strawhecker, Joseph M. Deitzel, John W. Gillespie
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
(2018)
Article
Polymer Science
Michael R. Roenbeck, Emil J. Sandoz-Rosado, Julia Cline, Vincent Wu, Paul Moy, Mehdi Afshari, David Reichert, Steven R. Lustig, Kenneth E. Strawhecker
Article
Polymer Science
Nihal Kanbargi, Weiguo Hu, Alan J. Lesser
POLYMER DEGRADATION AND STABILITY
(2017)
Article
Chemistry, Multidisciplinary
Vivek Vattipalli, Abdul Mughis Paracha, Weiguo Hu, Huiyong Chen, Wei Fan
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2018)
Article
Biochemistry & Molecular Biology
Oyuntuya Munkhbat, Mine Canakci, Shaokuan Zheng, Weiguo Hu, Barbara Osborne, Alexei A. Bogdanov, S. Thayumanavan
Article
Polymer Science
You-Chi Mason Wu, Weiguo Hu, Yuchen Sun, David Veysset, Steven E. Kooi, Keith A. Nelson, Timothy M. Swager, Alex J. Hsieh
Article
Physics, Applied
Yuchen Sun, You-Chi Mason Wu, David Veysset, Steven E. Kooi, Weiguo Hu, Timothy M. Swager, Keith A. Nelson, Alex J. Hsieh
APPLIED PHYSICS LETTERS
(2019)
Article
Polymer Science
Joshua S. Enokida, Weiguo Hu, Huagao Fang, Brian F. Morgan, Frederick L. Beyer, H. Henning Winter, E. Bryan Coughlin
Article
Chemistry, Physical
Uzodinma Okoroanyanwu, Ayush Bhardwaj, Vincent Einck, Alexander Ribbe, Weiguo Hu, Jacobo Morere Rodriguez, Wayde R. Schmidt, James J. Watkins
Summary: Silicon carbide (SiC) and silicon oxycarbide (SiOC) ceramic/carbon nanocomposites are prepared by photothermal pyrolysis of cross-linked polycarbosilanes and polysiloxanes using a high-intensity pulsed xenon flash lamp, demonstrating excellent performance as supercapacitor electrodes.
CHEMISTRY OF MATERIALS
(2021)
Article
Polymer Science
Alex J. Hsieh, You-Chi Mason Wu, Weiguo Hu, John P. Mikhail, David Veysset, Steven E. Kooi, Keith A. Nelson, Gregory C. Rutledge, Timothy M. Swager
Summary: This study investigates the impact of composition on material properties and reveals the mechanism of high-strain-rate impact response through the design of a novel polyurethane.
Article
Chemistry, Physical
Hui Yang, Muhammad Abdullah, Joeseph Bright, Weiguo Hu, Kevin Kittilstved, Yaobin Xu, Chongmin Wang, Xiangwu Zhang, Nianqiang Wu
Summary: Hydrogen treatment of LLTO nanofibers improved ion conductivity and chemical interaction in the composite electrolyte, leading to stable battery performance at room temperature.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Yao Wu, Qin Hu, Pu Fan, Yufeng Jiang, Wenkai Zhong, Weiguo Hu, Thomas P. Russell
Summary: With the recent development of non-fullerene acceptors, organic solar cells have achieved power conversion efficiencies exceeding 18%. The morphology of the BHJ active layer is crucial in determining device performance, with PTB7-Th/ITIC showing better performance than PTB7/ITIC due to smaller pi-pi stacking distance and domain size.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Polymer Science
Jonathan Cali, Weiguo Hu, Everett Kysor, Olaf Kohlmann
Summary: The aging behavior of polypropylene random copolymer (PP-RCP) reactor powder samples was studied using NMR relaxometry, revealing an increase in crystallinity and a decrease in segmental mobility of the interfacial phase during aging. There was a strong correlation between the population of the amorphous component and the T-2 relaxation time of the interfacial component, potentially due to secondary crystallization of the gamma form on the lateral surface of the scaffold crystallites during ambient temperature aging.
Article
Materials Science, Multidisciplinary
Chinmay Saraf, Elizabeth Stubbs, Weiguo Hu, Todd Emrick, Alan J. Lesser
Summary: This paper investigates the effect of DMMP on epoxy resins, showing that integrating DMMP into epoxy networks can improve flame retardance, stiffness, and reduce heat release, thereby slowing down combustion.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Kenneth E. Strawhecker, Emil J. Sandoz-Rosado, Taylor A. Stockdale, Eric D. Laird
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.