Article
Chemistry, Applied
Hongbin Li, Tengfei Li, Wenying Shi, Yin Tian, Jie Liu, Xiaohong Qin
Summary: By embedding PPTA/PSF microparticles into the PA composite layer of PSF hollow fiber membrane, the dye adsorption properties of the membrane were improved. The PPTA-embedded HFC membrane showed enhanced surface roughness, hydrophilicity, and electronegativity, resulting in increased dye adsorption capacity. These prepared PPTA-embedded hollow fiber composite membranes could potentially be used for treating textile dyeing wastewater.
REACTIVE & FUNCTIONAL POLYMERS
(2022)
Article
Chemistry, Multidisciplinary
Jingjing Yan, Huan Wang, Junyang Zeng, Xin Zhang, Ce-Wen Nan, Shujun Zhang
Summary: In this study, a novel carboxylated poly (p-phenylene terephthalamide) (c-PPTA) is synthesized and used to enhance the dielectric constant and thermal resistance of polyetherimide (PEI), resulting in a discharged energy density of 6.4 J cm(-3) at 150 degrees C. The introduction of c-PPTA molecules reduces the pi-pi stacking effect and increases the average chain spacing between polymer molecules, improving the dielectric constant. Additionally, c-PPTA molecules with stronger positive charges and high dipole moments capture electrons, reducing conduction loss and enhancing breakdown strength at high temperatures. The coiled capacitor made with the PEI/c-PPTA film demonstrates superior capacitance performances and higher working temperatures compared to commercial metalized PP capacitors, showing great potential for dielectric polymers in high-temperature electronic and electrical energy storage systems.
Article
Chemistry, Physical
Giacomo Fiorin, Mark J. Dello Stritto, Simona Percec, Michael L. Klein
Summary: This study investigates the response of PPTA crystals to shear strain, revealing that the crystal response varies depending on the shear mode applied. The findings highlight the importance of understanding the crystal behavior under different mechanical conditions for the development of Kevlar and new polyamide materials.
Article
Polymer Science
Ting Li, Zengxiao Wang, Hao Zhang, Yutong Cao, Zuming Hu, Junrong Yu, Yan Wang
Summary: In this study, a series of sulfone-functionalized poly(p-phenylene terephthalamide) (SPPTA) copolymers were successfully synthesized, which increased the polarity and surface free energy while disrupting the regular molecular chain arrangement. By reinforcing epoxy with SPPTA fiber, the interfacial shear strength of aramid fiber-reinforced composites was significantly enhanced by 20.8%, providing an effective method to improve adhesion.
HIGH PERFORMANCE POLYMERS
(2021)
Article
Materials Science, Composites
George Anagnostopoulos, Emmanuel N. Koukaras, John Parthenios, Costas Galiotis
Summary: The mechanical performance of fiber-reinforced composites is significantly affected by environmental factors, especially during the aging process. The decrease in interfacial shear strength and early failure of the composite material under tensile loads can be attributed to the significant increase of micro-cracking and micro-voids on the surface of the aged composites.
POLYMER COMPOSITES
(2021)
Article
Polymer Science
Mengyuan Hao, Zhen Hu, Yonggang Zhang, Xin Qian, Li Liu, Jiaming Yang, Xuefei Wang, Jianhai Zhi, Yudong Huang, Xiaolu Shi
Summary: In this study, an excellent UV resistance was achieved by creating a thermal oxidized PBO sheath on PBO fiber, resulting in improved mechanical properties and interfacial properties of the fiber.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Nanoscience & Nanotechnology
Tao Liu, Zhipeng He, Huichao Liu, Jinglong Yang, Shuo Zhang, Jiali Yu, Muwei Ji, Caizhen Zhu, Jian Xu
Summary: This study successfully fabricated high-performance heat-resistant solid-state supercapacitors for flexible and wearable electronics, based on PPTA fibers and composite fibers with excellent electrochemical performance, mechanical strength, and durability, meeting the requirements of flexibility and wearability for electronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Lei Liu, Changqing Miao, Di Song, Jingfu Shi, Wenxiang Liu
Summary: The degradation mechanisms of Poly(p-phenylene-terephthalamide) (PPTA) under Atomic oxygen (AO) impact are investigated, showing that the (010) surface has higher local temperature, leading to faster disintegration of the material. These simulation results provide atomic-scale insight for the design of crystalline polymers and composites to resist atomic oxygen erosion.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Materials Science, Composites
Yuexi Chen, Chunjie Xie, Shixuan Yang, Ran He, Yongyi Guo, Zhao-Xia Guo, Baohua Guo, Teng Qiu, Xinlin Tuo
Summary: A facile method is reported for the preparation of high performance all-para-aramid paper by impregnating heterocyclic aramid (HA) solution into a para-aramid paper (PAP). The HA molecules effectively act as a binder for both types of PPTA fibers, greatly enhancing the interfacial adhesion between fibers and densifying the paper structure. The resulting HA-impregnated PAPs exhibit much better mechanical properties, including significantly improved tensile strength and internal bond strength.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Rinku Pramanick, Sanjeev K. Verma, Pal Dinesh Kumar, Sirshendu De, Sudarsan Neogi, Swati Neogi
Summary: In this study, the photo-degradation kinetics of Kevlar fibers were quantified by correlating the degradation behavior of different properties with time. The results showed that the deterioration of any property followed three stages: an exponential decline, a short-term increase, and a steady and continuous drop. The suitable performance period of UV-aged fibers was estimated based on the initial two stages, and changes in the V50 ballistic limit were also estimated.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Polymer Science
Wenjie Feng, Jiadeng Zhu, Chen Yang, Wentao Li, Mengjin Jiang
Summary: Poly-p-phenylene-(1,3,4-oxadiazole) (POD) fibers have excellent thermal stability but poor ultraviolet (UV) resistance. This study developed a simple and effective method by blending poly-p-phenylene terephthamide (PPTA) with POD to obtain POD/PPTA composite fibers, which exhibited enhanced tensile strength and heat resistance. The improved UV resistance was attributed to the photoinduced electron transfer reaction in the composite fibers, as confirmed by experimental and simulation studies.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Long Zhu, Dmitriy A. Dikin, Simona Percec, Fei Ren
Summary: In this study, a layered structure was produced from PPTA fabrics and UHMWPE films via hot pressing. Plasma treatment on both PPTA and UHMWPE surfaces prior to lamination significantly improved the interlayer adhesion, with up to 91% enhancement observed in samples treated with plasma treated PPTA.
Article
Chemistry, Physical
Martijn Peters, Derese Desta, Senne Seneca, Gunter Reekmans, Peter Adriaensens, Jean-Paul Noben, Niels Hellings, Tanja Junkers, Anitha Ethirajan
Summary: Conjugated polymer nanoparticles (CNPs) are highly valued in bioimaging for their optical properties and biocompatibility, but face issues with unspecific protein adsorption. Research shows that PEGylation can modulate the uptake of CNPs by brain cells without affecting their optical properties, highlighting their potential as excellent bioimaging tools.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Polymer Science
Hongyu Jiang, Hong Zhang, Yaqing Wen, Liyun Tan, Xingzhong Fang, Guofei Chen
Summary: Mixed-BPADA was synthesized via aromatic nucleophilic substitution and CoPEIs were prepared from it. CoPEIs exhibited high Tg, low elongation, good solubility, and good mechanical properties. Compared to traditional PEIs, CoPEIs had lower melt viscosities and good melt processibility.
Article
Polymer Science
Yurachat Janpatompong, Kamil Suwada, Michael L. Turner, Guillaume De Bo
Summary: Understanding the stability of conjugated polymers towards mechanical stimuli is crucial for optimizing their use in electronic and optoelectronic devices. Mechanochemistry is a field that aims to control mechanical forces for chemical changes, and it can also be used to study the stability of conjugated polymers. Ultrasonication is a technique that can be used to test the mechanical integrity of phenylenevinylene block copolymers and demonstrate their stability to mechanical forces, making them suitable for flexible organic electronics.
Article
Multidisciplinary Sciences
Haoqi Li, Jiaxin Xi, Adrienne G. Donaghue, Jong Keum, Yao Zhao, Ke An, Erica R. McKenzie, Fei Ren
SCIENTIFIC REPORTS
(2020)
Article
Chemistry, Multidisciplinary
Yanbin Li, Qiuting Zhang, Yaoye Hong, Jie Yin
Summary: The study introduces 3D modular kirigami by cutting bulk materials into spatially closed-loop connected cut cubes to create a new class of 3D kirigami metamaterials, expanding the design space from 2D to 3D with diverse structures and unique properties.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Multidisciplinary Sciences
Zian Jia, Matheus C. Fernandes, Zhifei Deng, Ting Yang, Qiuting Zhang, Alfie Lethbridge, Jie Yin, Jae-Hwang Lee, Lin Han, James C. Weaver, Katia Bertoldi, Joanna Aizenberg, Mathias Kolle, Pete Vukusic, Ling Li
Summary: Biological systems have the ability to synthesize multifunctional materials adapted to specific needs, however, investigating structure-function relationships in nature can be challenging. By studying the mechanical and optical properties of the flower beetle's exoskeleton, researchers found that the micropillar-reinforced photonic multilayer enhanced mechanical robustness and optical appearance, leading to optical damage tolerance. This study sheds light on material-level design strategies in biological systems and could inspire bioinspired material innovations.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Polymer Science
Long Zhu, Dmitriy A. Dikin, Simona Percec, Fei Ren
Summary: In this study, a layered structure was produced from PPTA fabrics and UHMWPE films via hot pressing. Plasma treatment on both PPTA and UHMWPE surfaces prior to lamination significantly improved the interlayer adhesion, with up to 91% enhancement observed in samples treated with plasma treated PPTA.
Article
Chemistry, Multidisciplinary
Sakineh Chabi, Zeynel Guler, Adrian J. Brearley, Angelica D. Benavidez, Ting Shan Luk
Summary: This study reports the successful synthesis of true two-dimensional silicon carbide using a top-down approach. The isolated 2D SiC nanosheets are environmentally stable and show potential for applications in light-emitting devices. The thickness of the nanosheets showed a strong correlation with the intensity of the longitudinal optical Raman mode.
Review
Chemistry, Multidisciplinary
Yinding Chi, Yanbin Li, Yao Zhao, Yaoye Hong, Yichao Tang, Jie Yin
Summary: This article provides an overview of integrating bistable and multistable structures with soft actuating materials for high-performance soft actuators and soft/flexible robots. It presents the design principles and typical materials used in different categories of bistable elements, as well as their applications in diverse robotic systems. The challenges and opportunities in this emerging field are also discussed.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Yaoye Hong, Yinding Chi, Shuang Wu, Yanbin Li, Yong Zhu, Jie Yin
Summary: This article introduces a 3D shape morphing strategy based on cut boundary curvature and discusses its applications in grippers and heaters. By programming the curvature of cut boundaries, the authors successfully designed a universal gripper for delicate objects and created dynamically conformable heaters for human knees.
NATURE COMMUNICATIONS
(2022)
Article
Robotics
Shuang Wu, Gregory Langston Baker, Jie Yin, Yong Zhu
Summary: Thermal actuation is a common method for soft robots, but often limited by slow speed. By harnessing snap-through instability, a bimorph thermal actuator showed a significant increase in speed, reaching up to 28.7 cm(-1)/s with potential applications in fast crawling robots and biomimetic structures like Venus flytraps.
Article
Engineering, Mechanical
Yanbin Li, Xiaolei Song, Haijun Liu, Jie Yin
Summary: Through experiments, theoretical modeling, and numerical simulations, we studied the geometric mechanics and tunable band structures of a new class of folded kirigami structures. The folded design effectively overcomes polarization constraints and achieves a unique polarization switch. Geometric mechanics models predict how folding hinges determine shape changes and structural responses, leading to tunable bandgap structures.
EXTREME MECHANICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Yanbin Li, Jie Yin
Summary: This study introduces a new class of three-dimensional kirigami-inspired architected matter with enhanced reconfigurability and shape reprogrammability by harnessing kinematic bifurcation in mechanisms with multiple branched transformation paths. The module's rich mobilities derived from kinematic bifurcation allow for a variety of encoded transformation modes, enabling it to undergo consecutive shape changes and transform into various 3D architectures. This reconfigurable kinematic matter shows potential applications in reconfigurable metamaterials and morphing architectures.
MATERIALS TODAY PHYSICS
(2021)
Article
Chemistry, Physical
Yanbin Li, Yao Zhao, Yinding Chi, Yaoye Hong, Jie Yin
Summary: Improving energy efficiency in buildings is crucial for reducing energy consumption and improving environmental conditions. Recent research has shown that using environmentally adaptive shape-morphing building envelopes can enhance energy efficiency more effectively than traditional stationary ones.
MATERIALS TODAY ENERGY
(2021)
Article
Multidisciplinary Sciences
Yao Zhao, Yinding Chi, Yaoye Hong, Yanbin Li, Shu Yang, Jie Yin
Summary: This study presents twisted soft robots with embodied physical intelligence for adaptive, intelligent autonomous locomotion in various unstructured environments. These robots can harvest energy from the environment and navigate obstacles without human intervention.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Physical
Skyler Oglesby, Sergei A. Ivanov, Alejandra Londono-Calderon, Douglas Pete, Michael Thompson Pettes, Andrew Crandall Jones, Sakineh Chabi
Summary: This paper reports on the manufacturing of complex three-dimensional Si/C structures via a chemical vapor deposition method. The grown materials were characterized using various techniques, revealing the presence of micro/nanostructures with different compositions and dimensions. The findings have important implications for Si/C-based applications.
Article
Engineering, Mechanical
Long Zhu, Robert Evans, Yan Zhou, Fei Ren
Summary: Due to the poor machinability of compacted graphite iron (CGI), its manufacturing costs can increase significantly. This study aimed to improve the machinability of CGI by using different metalworking fluids. The effects of these fluids on tool wear behavior were examined, and the results showed that soluble metalworking fluid at specific dilution and sulfur compound levels exhibited the best performance.
Review
Chemistry, Multidisciplinary
Sakineh Chabi, Kushal Kadel