Polymers
·
2019
·Vol. 11
·期 10
·1599
·
IF 3.164
Xiaoming Qi,Wentong Yang,Laiming Yu,Wenjun Wang,Haohao Lu,Yanglong Wu,Shanwen Zhu,Yaofeng Zhu,Xiangdong Liu,Yubing Dong,Yaqin Fu
One-dimensional shape memory polymer fibers (SMPFs) have obvious advantages in mechanical properties, dispersion properties, and weavability. In this work, a method for fabricating semi-crystallization ethylene-vinyl acetate copolymer (EVA) fiber with two-way shape memory effect by melt spinning and ultraviolet (UV) curing was developed. Here, the effect of crosslink density on its performance was systematically analyzed by gel fraction measurement, tensile tests, DSC, and TMA analysis. The results showed that the crosslink density and shape memory properties of EVA fiber could be facilely adjusted by controlling UV curing time. The resulting EVA fiber with cylindrical structure had a diameter of 261.86 ± 13.07 μm, and its mechanical strength and elongation at break were 64.46 MPa and 114.33%, respectively. The critical impact of the crosslink density and applied constant stress on the two-way shape memory effect were analyzed. Moreover, the single EVA fiber could lift more than 143 times its own weight and achieve 9% reversible actuation strain. The reversible actuation capability was significantly enhanced by a simple winding design of the single EVA fiber, which provided great potential applications in smart textiles, flexible actuators, and artificial muscles.Keywords:shape memory polymer fiber;two-way shape memory effect;melt spinning;UV curing
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yutong Guo,Yujie Chen,Qili Yu,Hezhou Liu,Hua Li,Yinxian Yu
Two-way shape memory polymers (2WSMP) are highly desired for artificial muscles, soft actuators and sensors, while the stress-free 2WSMP greatly expands the practical potential of shape memory polymers. However, traditional 2WSMP cannot show high strength or good mechanical properties, which limited its practical application. It is important to create a new reversible polymer system in order to obtain more intricate movements, precise control and great mechanical properties. Herein, a two-way shape memory polyurethane was created using a new molecular strategy, which shows great properties, i.e., 2342% super stretch strain, 591 MPa true tensile strength, 708.04 J/kg of energy density, and 667.96 W/kg of power density. In addition, the 2WSMP could achieve a maximum 24.53% reversible transformation under 1 MPa stress, and 13.7% two-way shape change without external stress, respectively. In this polyurethane, the great mechanical properties and stress-free two-way shape memory effect are caused by the elastic polybutadiene (PB) segments, which acts as a “molecular spring.” Furthermore, this 2WSMP could simulate reversible muscle-like motion, and be employed in ligaments. Consequently, this polyurethane offers a fresh design concept for stress-free two-way performance memory polymers and has a wide range of potential applications in the field of artificial muscles, soft actuators and ligaments.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 43
·期 1
·103-110
·
IF 3.201
Funian Mo,Jianfeng Ban,Lulu Pan,Bo Shi,Shaorong Lu
In this study, a novel series of supramolecular liquid crystalline (LC) polyurethane composites, named SMPU–#HOBA (# represents the molar ratio of HOBA/BINA), were successfully prepared by incorporating hexadecyloxybenzoic acid (HOBA) into pyridine-containing polyurethane (PU). The effect of HOBA on the structure, morphology, and properties has been carefully investigated. The results demonstrate that the obtained SMPU–#HOBA composites not only maintained the LC property of the HOBA mesogen, but also enhanced the intrinsic crystallization of the soft segment phase. Thus, the composites showed an excellent multi-shape memory property with two crystalline temperatures. Moreover, self-gripping was demonstrated revealing reversible bidirectional shape memory by virtue of molecular flipping and movement of the hard segment domain. These composites display a rare combination of LC properties, multi-shape memory properties, and reversible bidirectional shape memory properties, which makes them ideal for many potential applications in smart temperature sensitive devices.
研究领域:
高分子科学
·
材料科学
·
智能材料
·
软物质物理
·
功能高分子
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2022
·Vol. 44
·期 3
·2200693
·
IF 5.006
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
Multiple and two-way reversible shape memory polymers (M/2W-SMPs) are highly promising for many fields due to large deformation, lightweight, strong recovery stress, and fast response rates. Herein, a semi-crystalline block poly(urethane-urea-amide) elastomers (PUUAs) are prepared by the copolymerization of isocyanate-terminated polyurethane (OPU) and amino-terminated oligomeric polyamide-1212 (OPA). PUUAs, composed of OPA as stationary phase and PTMEG as reversible phase, exhibit excellent rigidity, flexibility, and resilience, and cPUUA-C 7 -S 25 exhibits the best tensile property with strength of 10.3 MPa and elongation at break of 360.2%. Besides, all the PUUAs possess two crystallization/melting temperatures and a glass transition temperature, which endow PUUAs with multiple and reversible two-way shape memory effect (M/2W-SME). Physically crosslinked PUUA-C 0 -S 25 exhibits excellent dual and triple shape memory, and micro chemically crosslinked cPUUA-C 7 -S 25 further shows quadruple shape memory behavior. Additionally, both PUUA-C 0 -S 25 and cPUUA-C 7 -S 25 have 2W-SME. Intriguingly, cPUUA-C 7 -S 25 can achieve a higher temperature (up to 165 °C) SME, which makes it suitable for more complex and changeable applications. Based on the advantages of M/2W-SME, a temperature-responsive application scenario where PUUAs can transform spontaneously among different shapes is designed. These unique M/2W-SME and high-temperature SME will enable the applications of high-temperature sensors, actuators, and aerospace equipment.
研究领域:
材料科学
·
高分子化学
·
航空航天工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 106
·61847-61854
·
IF 3.708
Wenbing Li,Yanju Liu,Jinsong Leng
In this work, a novel type of shape memory polymer nanocomposite was fabricated using chemically cross-linked poly(ε-caprolactone) with allyl alcohol as the matrix and Fe3O4 nanoparticles decorated conductive multiwalled carbon nanotubes (Fe3O4@M) as a magnetism and electricity responsive source. The nanocomposite exhibited excellent shape memory performance with a multistage stimulus recovery from a temporary shape to a permanent shape, triggered by an alternating magnetic field, an electric field and hot water, respectively. Uniquely, the nanocomposite also displayed significant two-way reversible shape memory behavior under constant load conditions, which was not demonstrated previously. An alamar blue assay was also used to prove that the material possessed good biocompatibility. The results showed that the material could have good potential application in sensors, functional tissue engineering constructs and artificial muscles.
研究领域:
生物材料学
·
组织工程
·
智能材料
·
再生医学
·
生物力学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2022
·Vol. 13
·期 48
·6614-6624
·
IF 5.364
Tao Xiang,Jiao Wang,Lianghao Jia,Pan Wang,Shaobing Zhou
Two-way shape-memory polymers (2W-SMPs) have gained much attention due to their great potential in smart actuators, soft robotics, and artificial muscles. However, the application of 2W-SMPs is always limited by the complex fabrication process and strict triggering conditions. In this work, we propose that water-triggered 2W-SMPs can be facilely fabricated by one-step free radical polymerization of vinyl-ended 6-arm poly(ethylene glycol)-poly(ε-caprolactone) and vinyl-ended Pluronic F127. The crosslinked networks show a programmable and reversible water-triggered two-way shape-memory effect (2W-SME) based on two independent crystalline domains, with the highest angle reversibility of 45.2%. Due to the asymmetrical swelling induced by the asymmetrical cross-section chemical structure formed in the fabrication process, spontaneous bending behavior is observed, further enhancing the 2W-SME. In addition, the networks with 60% Pluronic F127 can be applied as a soft gripper and water level monitor, which exhibits programmable deformation. Therefore, a convenient and effective strategy is proposed to fabricate 2W-SMPs, which can be extended to other polymers to obtain water-triggered 2W-SMPs.
研究领域:
高分子材料科学
·
智能响应材料
·
软体驱动器
·
生物医用材料
·
功能高分子
·
形状记忆材料
✓ 已验证
DOI
高影响因子
Smart Materials and Structures
·
2025
·Vol. 34
·期 9
·095019
·
IF 3.8
Shaojun Chen,Yonghang Zhang,Youhan Zeng,Yujie Deng,Haitao Zhuo,Haiqiang Zhong,Huaiping Zhang
Shape memory polymers (SMPs) are one of the most typical intelligent materials. However, the precise regulation of the shape memory effect (SME) remains a critical challenge in the field. This study introduces a simple strategy for regulating the SME, employing crystalline thermoplastic polyurethane (CTPU) as the raw material and utilizing isophorone diisocyanate (IPDI) trimer to regulate both one-way SME (1W-SME) and two-way SME (2W-SME). Results showed that incorporation of IPDI-trimer induced a cross-linked network within CTPU. The tensile strength at break reached a maximum of 27.4 MPa, and the elongation at break remained relatively high (2484%) when the IPDI-trimer content was below 10wt%. The resulting cross-linked CTPU exhibited exceptional one-way shape memory performance, achieving a 99.9% recovery rate and 96.4% fixation rate. Notably, switchable 2W-SME emerged when IPDI-trimer concentrations exceeded 11wt%. This dual SME functionality, coupled with a 54.3% actuation magnitude, signified a significant advancement in SMPs capabilities. Systematic analysis reveals that shape memory activation originates from the synergistic effects of oriented crystalline domain melting and energy release within the cross-linked network under thermal stimuli. The precise control of 1W-SME and 2W-SME demonstrated in this study fundamentally arises from regulated crystallinity and cross-linking degree of CTPU. Owing to these enhanced integrated properties, these materials show great promise for diverse applications, particularly in smart sensors and intelligent robotics.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Manman Zhai,Weili Shao,Shuai Sun,Jing Bao,Haoge Qin,Yirui Chen,Yuhan Zhang,Fan Liu,Yalan Yang,QiaoLing Zhang,Baoji Hu
Shape memory polymers (SMPs), as a class of smart materials capable of altering their configurations in response to external stimuli, have garnered significant research attention. However, current studies on SMPs are limited by restricted response conditions, one-way responsive mode, and restricted adaptability. In this work, a core–shell micronano fiber membrane (T-P) with polyurethane elastomer (TPU) as the core layer and poly(vinylidene fluoride) (PVDF) as the shell layer was fabricated via coaxial electrospinning. The T-P was further integrated with a micronano fiber membrane (P–P) composed of a blend of poly(ethylene glycol) (PEG) and poly(vinyl alcohol) (PVA) to construct a bilayer-structured all-polymer P–P/T-P. Owing to the significant contrast in hydrophilicity, thermal properties, and mechanical properties between the two layers, the developed P–P/T-P exhibited excellent dual stimuli-responsive capabilities and two-way shape memory functionality. Under temperature-responsive process, the P–P/T-P achieved a recoverable bending angle of 75° with a shape recovery ratio of 98.67%. Under humidity-responsive process, the P–P/T-P achieved a recoverable bending angle of 32 ° with a shape recovery ratio of nearly 100%. The developed P–P/T-P was further applied to the responsive unit structure of smart windows, providing a strategy for the development of SMP-based intelligent devices adapted to diverse environments.
研究领域:
材料科学
·
高分子科学
·
智能材料
·
纳米技术
·
响应材料
·
静电纺丝
·
柔性机器人
·
功能纺织品
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Chen Bingshen,Xia Biao,Liao Shijie,Zeng Daiwei,Lin Tengfei,Wen Na,Gao Min,Zhao Chunlin,Wu Xiao,Lin Cong,Zheng Xiaochun,Gao Fei
Two-way shape memory polymers (2W-SMPs), which can transition between two distinct temporary shapes, have garnered significant attention from researchers. This study successfully developed thermadapt 2W-SMPs using syndiotactic 1,2-polybutadiene (SPB) by leveraging dynamic covalent crosslinking techniques. Initially, m-chloroperbenzoic acid (m-CPBA) was employed for the epoxidation of SPB. Cysteine (Cys) was subsequently introduced to form a dynamic covalent bond of β -hydroxy ester via the reaction between the epoxy groups on SPB and the carboxyl groups of Cys. The sulfhydryl groups of Cys can undergo oxidative coupling to form disulfide bonds, thereby establishing two distinct types of dynamic covalent bonds within the material and lowering its topological rearrangement temperature. Through the exchange reactions of these dynamic covalent bonds at elevated temperatures, the resulting material exhibits enhanced mechanical properties and can be reshaped in the solid state. This work provides a viable method for preparing recyclable thermally adaptive 2W-SMPs under stress-free conditions, thereby enriching the research landscape in the field of shape memory materials.
研究领域:
材料科学
·
高分子化学
·
智能材料
·
形状记忆聚合物
·
动态共价化学
·
可回收材料
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Xiaoming Qi,Wenjun Wang,Hongbo Dai,Yaofeng Zhu,Yubing Dong,Shao-Yun Fu,Qingqing Ni,Yaqin Fu
Shape memory polymer fibers (SMPFs) coated with conductive layers are attracting increasing attention in soft robots and wearable electronics. However, the thickness and poor stretchability of the conductive layer hinder its applications. Here, the multifunctional two-way shape memory reduced graphene oxide (RGO)/ethylene–vinyl acetate copolymer (EVA) composite yarn is designed following the “swelling-ultrasonicating” and one-step twisting procedures. These RGO/EVA composite fiber conductive paths connected with each other by constructing the helical conductive network. The RGO/EVA composite yarn presents excellent electro-thermal conversion performance and outstanding load-bearing capability, enabling controlled electro-driven reversible strain (more than 10% reversible strain) and high energy density (72.5 J/kg). Additionally, the composite yarn has great stretchability (130% strain), high strain sensing sensitivity (gauge factor of 7.3), large linear working range (up to 70% strain). This work provides an innovative manufacturing strategy for the RGO/EVA composite yarn with two-way shape memory, electro-driven actuation, and strain sensing performance.
研究领域:
材料科学
·
机器人技术
·
可穿戴技术
·
复合材料
·
机电系统
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xin Qi,Chaolun Pan,Liqun Zhang,Dongmei Yue
Shape memory polymers (SMPs) have attracted wide attention over the past few decades due to their fantastic applications in modern life. Nevertheless, excellent self-healing properties, recyclability, solid-state plasticity, and reversible shape-switching ability are necessary but can rarely be satisfied in one material. Herein, we report multifunctional SMPs by constructing a dynamic boronic ester bond cross-linking network using sustainable Eucommia ulmoides gum as a raw material. Thanks to the crystallization and wide melting temperature range, these kinds of SMPs have thermal-triggered one-way shape memory performance and show two-way shape memory properties, whether under constant stress or stress-free conditions. Owing to the dynamic nature of the boronic ester bond, it exhibits good self-healing properties (near 100% at 80 °C), shape reconfigurability, and chemical recyclability. In addition, by incorporating multiwalled carbon nanotubes, the formed composite is responsive to 808 nm near-infrared light. Its applications are further exploited, including photoresponsive actuators, vascular stents, and light-driven switches. This paper provides a simple way for fabricating multifunctional SMPs, and the as-prepared materials have potential applications in diverse fields, such as biomedicine, intelligent sensing, and soft robotics.
研究领域:
材料科学
·
聚合物化学
·
生物医学工程
·
纳米技术
·
机器人技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）