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
MATERIALS & DESIGN
·
2022
·
IF 9.417
Wenxin Wang,Jing Yang,Wei Li,Yongtao Yao,Yaqian Yan,Wenjing Wang,Ning Wang,Jinsong Leng
Shape memory materials draw much attention due to various promising potential applications. This work prepares a novel shape memory composite via grading photo-thermal curing method, which has not yet been reported. Expectedly, it merges advantages of epoxy-based shape memory polymer (EP) and polyvinyl alcohol-based shape memory polymer (PVA), which has applicable stiffness and multi-stimuli responsive performance. The unsatisfactory mechanical properties of most water-driven shape memory polymer (SMP) is expected to be solved by this fabrication strategy, so that the application range of water-driven SMP could be further extended. The synergistic plasticization of PVA and EP dominates water-driven shape memory behavior of this composite. Interestingly, its water-driven shape memory performance is able to be further improved by immersed in HCl/EtOH solution. The glassy-to-rubbery modulus ratio ( E′ g /E′ r ) of the PVA/EP-HCl/EtOH is about 650 after immersed in 0.1 mol/L HCl/EtOH for 6 h. In addition, this immersed method also can solve the post curing problem of such cationic photocuring. It is an easy, efficient, economical strategy for improving synergistic water-driven shape memory performance. Furthermore, this shape memory composite is expected to provide new perspective and practical approach to realize the intellectualization of underwater deployment and release structure.
研究领域:
材料科学
·
高分子科学
·
机械工程
✓ 已验证
产品关联
DOI
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
Smart Materials and Structures
·
2016
·Vol. 25
·期 8
·085023
·
IF 2.769
Chen Qian,Yubing Dong,Yaofeng Zhu,Yaqin Fu
Semi-crystalline shape memory polymers exhibit two-way shape memory effect (2W-SME) under constant stresses through crystallization-induced elongation upon cooling and melting-induced constriction upon heating. The applied constant stress influenced the prediction and usability of 2W-SME in practical applications without any external force. Here the reversible shape transition in EVA-shaped memory polymer was quantitative analyzed under a suitable temperature range and external stress-free condition. The fraction of reversible strain increased with increasing upper temperature (Thigh) within the temperature range and reached the maximum value of 13.62% at 70 °C. However, reversible strain transition was almost lost when Thigh exceeded 80 °C because of complete melting of crystalline scaffold, known as the latent recrystallization template. The non-isothermal annealing of EVA 2W-SMP under changing circulating temperatures was confirmed. Moreover, the orientation of crystallization was retained at high temperatures. These findings may contribute to design an appropriate shape memory protocol based on application-specific requirements.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yongkang Bai,Jiamei Liu,Junping Ju,Xin Chen
Remote controllability and multiple-shape memory performance are two important functions for shape memory polymers (SMPs) in engineering applications, which are still a challenge to achieve via a facile approach. Herein, we synthesized a shape memory composite with near-infrared (NIR) light-induced triple-shape memory performance by in situ formation of iron tannate (FeTA) nanoparticles in cross-linked poly(ethylene-co-vinyl alcohol) (EVOH). EVOH possessed two transition temperatures enabling the composites with triple-shape memory behavior, while FeTA nanoparticles served as the photothermal conversion factor for NIR light-induced responsiveness. Because the light-induced triple-shape memory performance of the composite is highly dependent on its photothermal conversion property, the control of FeTA doping would also be an effective solution to prepare light-induced multiple-SMPs with various shape transformations. Moreover, the composites exhibited high light-driving recovery stress, which could lift burdens 1600 times heavier than their own weight, indicating their great potential as a smart soft actuator for various applications.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Haitao Zhuo,Hao Wen,Guanlun Liu,Heng Chen,Shaojun Chen
There have been great developments in shape memory polymers in recent years. However, the permanent shape was usually predetermined and could not be changed during the shape memory process. This work reports a facile method for permanent shape reconfiguration of shape memory polymers using a water-soaking treatment. The impact of water molecules on the structure, morphology, and properties of zwitterionic polyurethanes (ZPUs) was carefully investigated. FT-IR, DSC , TGA , and DMA analysis revealed that polymer chains of ZPU can be easily activated by absorbing water molecules and was solidified again by removal of water molecules. Direct water-soaking treatment can eliminate previous shape recovery capability and then be used to reconfigure a new permanent shape for a new thermally induced shape memory process. Thus, this work provides an alternative approach for manufacturing complicated devices at room temperature and for easily regulating the thermally induced shape memory effect.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yaya Li,Lele Ji,Chang Long,Yuancheng Zhang,Wei Zhao,Xin Li,Xiaomeng Zhang,Zhe Cui,Peng Fu,Xinchang Pang,Minying Liu
Thermoplastic polyamide elastomer (TPAE) is usually synthesized by polycondensation of polyamide and polyether or polyester through esterification/amidation in a stainless steel reactor, which requires harsh reaction conditions and a long reaction time. Unfortunately, this synthetic method cannot produce a high-viscosity sample or a micro-cross-linked sample. In the present work, a kind of TPAE named poly(urethane-urea-amide) (PUUA) was prepared by amino-terminated long carbon chain polyamide 1212 (PA1212) and diisocyanate-terminated polytetramethylene ether glycol (PTMG) through reactive extrusion, which simplified the reaction conditions and shortened the reaction time. Through combining different PA1212 hard segments and PTMG soft segments, PUUAs showed excellent and adjustable mechanical and thermal properties. And the tensile strength and elongation at break could vary in the range of 6–38 MPa and 180–490%, respectively. With the aid of melting/crystallization temperature or glass transition temperature, PUUA exhibited an outstanding one-way shape memory effect (1W-SME) with a shape fixation ratio (Rf) of ∼97.5% and two-way shape memory effect (2W-SME) with a response strain (εres) of 3.8–14.3% for quasi 2W-SME and ∼2.9% for reversible 2W-SME. Furthermore, PUUA was processed into the wire for fused deposition modeling (FDM), followed by optimization of printing parameters, and then printed into a “swan” possessing a 2W-SME achieving 4D printing. The reactive extrusion production technology not only offers a simple way for synthesizing TPAE industrially but also broadens the application range of TPAE.
研究领域:
材料科学
·
高分子科学
·
机械工程
·
增材制造
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2018
·Vol. 26
·期 11
·1035-1041
·
IF 1.767
Fu Shuqin,Zhu Jiaping,Chen Shaojun
As a new type of smart polymers, the shape memory polyurethanes attract increasing attention because of their wide use in various applications. Herein, a serials of novel thermo-responsive shape memory polyurethane networks were developed by chemical cross-linking of polycaprolactone with 1,3,5,7-tetrahydroxyadamantane. The polyurethane networks were characterized in relation to their microstructure, cross-linking density, surface appearance, thermal properties, static and dynamic mechanical properties, and shape memory behavior. It was found that the prepared polyurethane networks can exhibit excellent thermo-responsive shape memory properties at body temperature by controlling the molar ratio of 1,3,5,7-tetrahydroxyadamantane and polycaprolactone. Moreover, the incorporation of 1,3,5,7-tetrahydroxyadamantane substantially improved the mechanical properties of the final polyurethane networks. The versatility of the synthesized polyurethane networks is reflected by its dual- and triple-shape memory performance. It can be anticipated that the synthesized polyurethane networks could be used as smart materials for applications involving shape memory polymers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 29
·11490-11498
·
IF 0
Lisheng Zhang,Miaoming Huang,Ruilei Yu,Juncheng Huang,Xia Dong,Ruoyu Zhang,Jin Zhu
One of the obvious shortcomings of bio-based shape memory polyurethanes (Bio-SMPUs), which usually use natural oil based polyols as the soft segment, is their low mechanical strength because the long dangling chains (six to eight carbons) in these polyols prevent the Bio-SMPUs from deep micro-phase separation, and consequently deteriorate their mechanical properties. In this work, we prepared a bio-based polyester diol for the soft segment, in which short side chains (CC) were used to tune the transition temperature and the morphology of the Bio-SMPUs. The moderate concentration of short branch chains barely affects the micro-phase separation, and the mechanical properties of the Bio-SMPUs are quite satisfactory. With the same 70 wt% soft segment content, the tensile strength in this work is 13.2 MPa, while the one using ricinoleate-based soft segments reported 2.8 MPa. Through proper shape memory programming, the synthesized Bio-SMPUs show good shape memory properties with a shape fixing rate of greater than 98% and a shape recovery rate of 85% in the first cycle and greater than 90% in the following cycles. This study provides a framework for developing bio-based SMPUs with high mechanical and good shape memory properties at the same time.
研究领域:
材料科学
·
聚合物化学
·
生物降解材料
✓ 已验证
产品关联
DOI
Journal of Materials Chemistry C
·
2013
·Vol. 2
·期 6
·1041-1049
·
IF 0
Shaojun Chen,Hongming Yuan,Zaochuan Ge,Shiguo Chen,Haitao Zhuo,Jianhong Liu
Liquid-crystalline polymers and shape-memory polymers are attractive to many researchers. This paper proposes a strategy to prepare liquid-crystalline shape-memory polyurethane (LC-SMPU) composites having both liquid-crystalline properties and shape-memory properties. A series of LC-SMPU composites are successfully prepared by doping different concentrations of 4-hexadecyloxybenzoic acid (HOBA) into shape-memory polyurethanes (SMPUs). The results show that the HOBA is physically mixed with the polyurethane matrix. The doped HOBA is categorised as HOBA captured by the polyurethane chains and free HOBA in the LC-SMPU composite. A higher content of HOBA results in a higher fraction of free HOBA, and more HOBA molecules enter into the polyurethane matrix at higher annealing temperatures. The resulting LC-SMPU composites keep their intrinsic liquid-crystalline properties and the crystallisation properties of HOBA. The LC-SMPU composites contain a two-phase, separated structure: a HOBA crystalline phase and the polyurethane matrix. Thus, the LC-SMPU composites show a two-stage decrease in modulus. Finally, shape-memory tests show that the LC-SMPU composites exhibit a triple shape-memory effect; in the first step, strain recovery is associated with the glass transition of the amorphous polyurethane matrix, and in the second step, strain recovery results from the melting transition of the HOBA crystal dopants.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Chunzi Lv,Zhijian Zhou,Yuqi Li,Shaorong Lu,Yongkang Bai
The integration of materials with multiple functions, like actuating, sensing, and self-powering, is a key focus of soft robotics attributed to their promising applications in various fields. However, integrating these functions in a single material still remains a significant challenge. Herein, we proposed a polyvinyl alcohol/ multiwalled carbon nanotube porous composite with multi-responsive shape memory actuating and self-powered sensing functions. For actuators, the porous composites exhibited excellent thermo, near-infrared light, and water-induced shape memory performance with high shape fixation and shape recovery ratio over 94 %. For sensors, the fabricated porous materials-based triboelectric nanogenerator (PTENGs) exhibited high output performance with power density of 4.57 W m −2 , enabling their use as pressure and humidity sensors. Moreover, it was found that the output performance of PTENG can be adjusted utilizing the shape memory effect of porous composites, while the self-monitoring function of shape memory actuators was achieved through the self-powered sensing of PTENG. This work presents a new strategy for developing an integrated material with multi-responsive actuating and self-powered sensing functions.
研究领域:
材料科学
·
软体机器人
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）