Article
Materials Science, Composites
Run Zhang, Wenqiang Yan, Qun Yang, Xiaonong Chen, Ke Chen, Yun Ding, Ping Xue
Summary: This study aims to improve the shape memory property of ultra-high-molecular-weight polyethylene (UHMWPE) by incorporating carbon nanotubes (CNT). The experimental results show that the bending shape memory property of UHMWPE/CNT composite is significantly enhanced, while the cyclic tensile shape memory property remains unchanged.
POLYMER COMPOSITES
(2022)
Article
Polymer Science
Bato Ch. Kholkhoev, Zakhar A. Matveev, Kseniia N. Bardakova, Ivan A. Farion, Peter S. Timashev, Vitalii F. Burdukovskii
Summary: Aromatic-aliphatic random copolymers (coPBIs) were synthesized and characterized for their physicochemical properties. The copolymers exhibited high mechanical strength and increased thermal stability with higher aromatic content. The glass transition temperatures of coPBIs were in good agreement with calculated values and depended on the aromatic/aliphatic ratio. The coPBI with 25 mol% aromatic content showed improved shape memory performance due to increased content of rigid aromatic segments and more effective intermolecular interaction.
Article
Polymer Science
Panuwat Luengrojanakul, Phattharin Mora, Kittipon Bunyanuwat, Chanchira Jubsilp, Sarawut Rimdusit
Summary: Shape-memory carbon fiber polymer composites reinforced with graphene nanoplatelets were prepared and their performance was analyzed. The results showed that the addition of the nanoplatelets improved the strength, modulus, and shape-memory effect of the composites. However, at higher fiber mass fractions, the performance decreased.
Article
Materials Science, Paper & Wood
Merve Uyan, Melih Soner Celiktas
Summary: The use of bio-based materials in the production of shape memory polymer composite materials (SMPCs) has attracted interest. This study used shape memory polymer containing alkaline lignin as the matrix phase and hemp/cotton fiber as the reinforcement element to produce bio-based SMPCs. Comparison between hemp/cotton fiber reinforced SMPCs and glass fiber reinforced SMPCs revealed their similar properties. The SMPCs produced using alkaline pre-treated hemp/cotton fiber and 1-layer carbon fiber reinforcement showed promising properties as remotely controllable smart materials that can be activated by temperature.
Article
Polymer Science
Zhihua Li, Yu Yang, Li Ma, Hongxin Liu, Xin Zhang
Summary: In this study, a binary shape memory epoxy resin system was developed and applied to carbon fiber reinforced shape memory composites. It was found that the addition of diglycidyl-4,5-epoxycyclohexane-1,2-dicarboxylate epoxy resin significantly improved the glass transition temperature, tensile strength, and Young's modulus of the composites, while reducing the impact strength. The shape memory composites exhibited good shape fixity and recovery ratios after 30 cycles, and showed excellent mechanical properties compared to neat shape memory epoxy resin.
Article
Polymer Science
Xiaodong Wang, Zhenghong Li
Summary: The study investigates the effect of local vibration and structural rearrangement of macromolecular chains on the shape memory behavior of SMPs using the extended free volume theory. The dependences of glass transition, thermomechanical behavior, and triple-shape recovery behavior of SMPs on thermal history are discussed by introducing the phase transition theory. The accumulation of remote free volume upon heating is identified as the driving force for the shape memory effect in SMPs.
Article
Materials Science, Multidisciplinary
Wenxin Wang, Jing Yang, Wei Li, Yongtao Yao, Yaqian Yan, Wenjing Wang, Ning Wang, Jinsong Leng
Summary: This study prepares a novel shape memory composite via grading photo-thermal curing method, which combines the advantages of epoxy-based shape memory polymer (EP) and polyvinyl alcohol-based shape memory polymer (PVA), and solves the issue of unsatisfactory mechanical properties of water-driven shape memory polymers.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Characterization & Testing
Qiao Tan, Fengfeng Li, Liwu Liu, Yanju Liu, Jinsong Leng
Summary: The effect of space environment on the properties of shape memory polymer composites was studied. Carbon fiber/epoxy shape memory polymer composites were evaluated for vacuum thermal cycling, ultraviolet radiation, and atomic oxygen separately using simulation facilities. The results showed that thermal cycling increased the tensile modulus but decreased the breaking strength and elongation at break of the material. The effect of ultraviolet radiation depended on the radiation dose received, and atomic oxygen slightly affected the mechanical properties of the material.
Article
Materials Science, Composites
Yonglin Zhang, Tianzhen Liu, Xin Lan, Yanju Liu, Jinsong Leng, Liwu Liu
Summary: This paper presents the design, fabrication, evaluation, and application of a compliant robotic grip structure based on shape memory polymer composites, demonstrating its superior performance through DMA, FEA, and experimental verification.
COMPOSITES COMMUNICATIONS
(2022)
Article
Materials Science, Composites
De-xiang Sun, Chen-hui Huang, Yu-tong Mao, Xiao-dong Qi, Yan-zhou Lei, Yong Wang
Summary: Efficiently designing the interfacial interaction between nanoparticles and blend components remains challenging. Modification of carbon nanofibers (CNFs) through various strategies showed improved fracture toughness in poly(L-lactic acid)/thermoplastic polyurethane (PLLA/TPU) blends, with hydroxylated CNFs forming hydrogen bonds and epoxidized CNFs forming covalent bonds with blend components. Modified CNFs exhibited enhanced light-induced mechanical-damage-healing behaviors and shape memory performances in the blends.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Haiyang Du, Yongtao Yao, Yang Liu, Wei Zhao
Summary: In this study, a composite strip with a two-way reversible bending behavior was created by embedding a NiTi shape memory alloy wire into a rubber/shape memory polymer (SMP) soft matrix. The elastic moduli of the SMA wire were characterized to increase by about 3 times (18.6 GPa at martensite phase and 50.1 GPa at austenite phase) from 25 degrees C to 90 degrees C. A SMA composite strip using SMP to replace the rubber matrix was fabricated, which significantly improved the load-bearing ability (16-fold) at 28 degrees C. The rubber/SMP-based SMA strip exhibited good two-way bending behaviors with a high shape deploying ratio above 80%. The application of rubber/SMP-based composite strips in a space-deployable antenna model with two-way reversible bending behavior was developed and demonstrated through a heating and cooling temperature cycle.
APPLIED SCIENCES-BASEL
(2023)
Article
Polymer Science
Guangqin Shi, Cheng Huang, Xinyu Cao, Minying Liu, Jingnan Zhang, Kun Zheng, Yongmei Ma
Summary: A triple-shape memory polymer was prepared by chemically crosslinking melting blending of ethylene-vinyl acetate copolymer (EVA) and poly(propylene carbonate) (PPC), showing excellent triple shape memory effects with shape fixing ratio and shape recovery ratio both over 90%. The key to achieving triple SME is the matching of the modulus of the two components, with the glassy PPC having a higher modulus than the semi-crystalline EVA.
Article
Engineering, Aerospace
Debby Margoy, Irina Gouzman, Eitan Grossman, Asaf Bolker, Noam Eliaz, Ronen Verker
Summary: Shape memory polymers have the ability to recover their permanent shape and are suitable for deployable devices in spacecraft. However, the impact of vacuum environment on their deployment has not been thoroughly studied. This work introduces a method to improve energetic efficiency and a motion sensing technique for shape memory polymer actuators.
Article
Materials Science, Composites
Xiaoyang Yi, Guijuan Shen, Xianglong Meng, Haizhen Wang, Zhiyong Gao, Wei Cai, Liancheng Zhao
Summary: In this study, in-situ TiB whiskers and La2O3 particles with network structure were designed and introduced into Ti-Ni composites. As the LaB6 content increases, the amounts of in-situ TiB whiskers and La2O3 particles also increase in the composites. The mechanical properties of the composites first decrease and then increase with the increasing LaB6 content.
COMPOSITES COMMUNICATIONS
(2021)
Article
Materials Science, Composites
Bingfei Liu, Fangfang Zhang, Rui Zhou, Yigang Sun
Summary: This study investigates the mechanical behaviors of SMPC-SMAs under different loading conditions, considering the influence of temperature changes on phase transition and discussing the thermomechanical behaviors of these composites. The results show that SMPC-SMAs display different mechanical properties than pure SMAs or SMPs, making them a promising prospect for engineering applications.
POLYMER COMPOSITES
(2021)
