形状记忆聚氨酯的研究与应用

聚氨酯（Polyurethanes,PUs)是一种多嵌段共聚物，可通过调节原料的组成和配比，得到性能各异的新型功能高分子材料，由硬段和软段组的PUs分子链，具有微相分离的本体结构，符合热致形状记忆高分子（TSMP）的条件，并具有良好的强度，硬度，耐磨性，耐挠曲性和生物相容性等优异性，可望在军事，航空及图书馆经济各项领域得到广泛应用。笔者概括了形状记忆PUs的记忆原理和特征，并对形状记忆PUs的研究现状和应用前景了重点阐述。     

智能高分子材料的开发与应用

介绍具有形状记忆智能和应签智能智能高分子材料的作用原理并对其应用领域进行了探讨。     

形状记忆树脂

前言高分子材料广泛应用于人类生活和生产的各个领域。近年来又开发了导电、压电等功能性高分子材料。而双层金属,形状记忆合金等具有热敏功能的金属材料,在应用领域中也颇有成效。但金属材料存在成本高、     

形状记忆树脂及其应用

形状记忆树脂是一种新型功能高分子材料．本文在论述其形状记忆原理的基础上，着重讨论了形状记忆树脂的种类、特性以及制各方法，并介绍了它们的应用与发展前景．     

德研制成功形状记忆聚合物

德国科学家目前已开发出一种形状记忆聚合物，该聚合物可通过一个磁场来触发其形状记忆功能，可用于不适合采用加热或辐射改变聚合物形状的场合。     

神奇的形状记忆材料

提起形状记忆材料 ,许多人一定感到很神秘 ,更多的人感到陌生。但是当您使用手机通话时 ,当您购买漂亮的文胸时 ;当您乘坐汽车外出旅游或出差享受豪华宾馆的住宿条件时 ,你也许就在同形状记忆材料打交道了。1　形状记忆材料的崛起形状记忆是指具有某一原始形状的制品 ,经过形变并定型后 ,在特定的外界条件下能自动恢复原始形状的现象。具有该现象的材料被称作形状记忆材料。形状记忆效应是 1 95 1年美国 Read等人在 Au-Cd合金中首先发现的 ,1 95 3年在 In- Ti合金中 ,也发现了同样现象 ,当时并没有引人注目。但是 ,1 964年美国 Buehler等…     

形状记忆聚氨酯的发展现状及应用前景

介绍了形状记忆聚氨酯的合成研究进展、性能和形状记忆原理以及应用状况，并详细介绍了其在纺织和医学方面的应用前景。     

Ce-TZP材料形状记忆效应的研究

本文对相变增韧氧化锆陶瓷Ce-TZP材料的形状记忆效应进行了研究。研究结果表明:在张应力作用下,含有10mol％CeO_2的Ce-TZP陶瓷具有形状记忆效应。材料的形状记忆效应,由材料内稳定剂的含量及材料的显微结构所决定。记忆量与材料的变形量和环境的温度有关。本文还在理论上对产生形状记忆的条件及其机理作了初步分析和探讨。     

形状记忆聚氨酯的研究进展

综述了形状记忆聚氨酯的形状记忆原理，介绍了形状记忆聚氨酯的研究现状及应用前景。     

双亲环氧树脂基荧光形状记忆薄膜的构筑

以聚乙二醇单甲醚为亲水段，双酚A型环氧树脂为疏水段，异氟尔酮二异氰酸酯为链接剂制备了含环氧基的双亲性大分子WEG，该双亲性大分子与荧光剂(3-(9-咔唑基)苯甲酸)、双酚A型环氧树脂E51在选择性溶剂(水)中共组装形成水性乳液。该乳液与改性胺类固化剂以一定比例混合并于室温固化后，制备了具光致发光(荧光)功能的形状记忆高分子薄膜，采用FTIR、NMR、GPC、纳米粒度仪、荧光光谱仪和DSC等对WEG、乳液和薄膜的结构和性能进行了表征。结果表明，乳液具有较好的粒径稳定性。荧光形状记忆薄膜具有较好的光致发光功能，可在刺激响应条件下（如热）快速（7 s）恢复其原始形状，形状回复率可达94.3%。     

智能型温敏形状记忆高分子材料的研究进展

综述了热致感应型形状记忆高分子材料的工作原理、形成记忆功能的方法及其分类和应用,介绍了热致感应型形状记忆纤维的生产技术和国内外研究发展状况,并对热致感应型形状记忆高分子材料的未来研究发展趋势作以评述。     

形状记忆功能纤维及纺织品

形状记忆功能纺织品的开发是近年来在纺织材料学中研究较热门的新兴技术。介绍了该材料国内外的研究进展,对形状记忆合金类、形状记忆聚合物类和形状记忆水凝胶类功能纺织品进行了概述;并对各种不同类别的形状记忆功能纺织品的形变机理和适用领域进行了详细阐述,最后展望了形状记忆功能纺织品的未来。     

Microstructural and mechanical property evolutions of shape memory polyurethane during a thermodynamic cycle

To better understand the shape memory behaviors of synthesized shape memory polyurethane (SMPU) sealant with a tailored transition temperature (T_t) for concrete pavement joints, the thermal and dynamic mechanical properties of SMPU were first characterized to determine the shape memory switching temperature of SMPU. Then the microstructural and mechanical property evolutions of SMPU in the original, programmed, and recovered states during a five‐step thermodynamic cycle were discussed, respectively. The results indicate that the tailored T_t of prepared SMPU can be used as the shape memory switching temperature to match its working temperature. Further, the programming causes the phase separation in SMPU, leading to an obvious anisotropy. The SMPU has satisfactory shape memory performance. The orientation of molecular chains in soft segments is confirmed along the stretching direction. The oriented molecular chains can restore to the naturally curled state during the free recovery. Finally, the programming improves the mechanical properties of SMPU. The recovered SMPU shows a slight decrease in mechanical properties because of the partially impaired crystal structures and broken molecular segments during the programming and recovery. It is concluded that the synthesized SMPU with the specially tailored T_t is suitable to use as a sealant of concrete pavement joints. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 45703.     

Review on the temperature memory effect in shape memory alloys

Shape memory alloys (SMAs) are well known for their unique shape memory effect (SME) and superelasticity (SE) behavior. The SME and SE have been extensively investigated in past decades due to their potential use in many applications, especially for smart materials. The unique effects of the SME and SE originate from martensitic transformation and its reverse transformation. Apart from the SME and SE, SMAs also exhibit a unique property of memorizing the point of interruption of martensite to parent phase transformation. If a reverse transformation of a SMA is arrested at a temperature between reverse transformation start temperature (A _s) and reverse transformation finish temperature (A _f), a kinetic stop will appear in the next complete transformation cycle. The kinetic stop temperature is a ‘memory’ of the previous arrested temperature. This unique phenomenon in SMAs is called temperature memory effect (TME). The TME can be wiped out by heating the SMAs to a temperature higher than A _f. The TME is a specific characteristic of the SMAs, which can be observed in TiNi-based and Cu-based alloys. TME can also occur in the R-phase transformation. However, the TME in the R-phase transformation is much weaker than that in the martensite to parent transformation. The decrease of elastic energy after incomplete cycle on heating procedure and the motion of domain walls have significant contributions to the TME. In this paper, the TME in the TiNi-based and Cu-based alloys including wires, slabs and films is characterized by electronic-resistance, elongation and DSC methods. The mechanism of the TME is discussed.     

热致感应型形状记忆高分子材料与纤维

介绍了热致感应型形状记忆高分子材料的机理、制备方法及其应用,重点介绍了热致感应型形状 记忆纤维的混纺和后整理生产技术及国内外研究发展状况。指出今后应大力开发热致感应形状记忆纤维的 直接纺丝生产技术,提高纤维的形变回复力及尺寸稳定性,纤维的应用前景看好。     

Effect of glucose crosslinking on thermomechanical properties and shape memory effect of PET‐PEG copolymers

Poly(ethylene terephthalate) (PET) and poly (ethylene glycol) (PEG) copolymers crosslinked with glucose as a crosslinker are prepared to improve their mechanical and shape memory properties compared to the one without crosslinking. Composition of PEG and glucose is varied to search for the one with the best mechanical and shape memory properties. The highest shape recovery rate is found in the copolymer composed of 25 mol % PEG‐200 and 2.0 mol % glucose. The result that crosslinking by glucose improves the shape recovery rate and supports the high shape recovery rate under the repetitive cyclic test conditions, compared to the one without crosslinking, will be discussed in the points of the structure and shape memory mechanism. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Crosslinked polyurethanes with shape memory properties

A series of shape memory polyurethanes (SMPUs) was prepared from polycaprolactone diol (PCL) 4000, 1,4‐butanediol (BDO), dimethylol propionic acid (DMPA), triethylamine, and 4, 4′‐diphenylmethane diisocyanate (MDI), to which excess MDI or glycerin were added to obtain crosslinked shape memory polyurethanes. Their mechanical, thermomechanical, thermal and shape memory properties were investigated by using differential scanning calorimetry (DSC), Fourier‐transform (FT‐IR) spectroscopy, dynamic mechanical analysis (DMA) and tensile testing. The results showed that crosslinked SMPUs have better thermal and thermomechanical properties than those prepared from linear polyurethanes and display good shape memory effects. Copyright © 2005 Society of Chemical Industry     

Shape memory polyurethane-based electrospun yarns for thermo-responsive actuation

Electrospun nanofibrous yarns of shape memory polyurethane (SMPU)-based nanofibers were successfully prepared. The electrospun yarns were analyzed to assess the dependence of mechanical and shape memory properties on the yarn twist angle. The yarn with a 60° twist angle has high compactness and density, leading to increased tensile strength, elastic modulus, and strain energy. In addition, this yarn shows a significant improvement in the shape memory recovery stress compared with the non-twisted SMPU nanofibers. Moreover, thermal stimuli allowed for the 60° twisted yarn to lift a load that is 103 times heavier than itself. This yarn had a shape recovery stress of 0.61 MPa and generated a 7.95 mJ recovery energy. The results suggest the electrospun yarns could be used as actuators and sensing devices in the medical and biological fields.