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1.
制备了水刺激响应丁腈橡胶(NBR)/聚乙二醇(PEO)形状记忆共混物,考察了NBR与PEO共混比对共混物硫化特性、吸水性、物理机械性能和形状记忆性能的影响。结果表明,在NBR/PEO形状记忆共混物中,随着PEO用量的增加,共混物的拉伸强度、硬度及吸水率均有所提高,但交联密度和扯断伸长率都呈下降趋势,形状记忆固定率明显升高,而形状记忆回复率则有所下降。当NBR与PEO的质量比为40/60时共混物具有最佳的水刺激响应形状记忆性能。  相似文献   

2.
通过形状记忆性能测试、DSC和DMTA等热分析技术重点,探讨了结晶对EVA形状记忆性能的影响以及形状记忆性能的工艺性和使用性能的影响。结果表明,随着结晶度的增加,形状回复率变化不大。而形状固定率增加;热固性SMP的形状回复性由交联网络的完善程度决定,结晶度对其影响不大;结晶对形状记忆材料的响应温度和模量有较大影响,结晶度高响应温度高,常温模量高。形状固定率由聚合物的力学松弛特别是蠕变决定,结晶度只是其影响因素之一,不是决定性因素。从形状记忆机理出发初步揭示了影响热固性形状记忆高分子材料形状记忆性能的本质因素。  相似文献   

3.
形状记忆树脂的开发与应用   总被引:2,自引:0,他引:2  
论述了形状记忆树脂的形状记忆原理,介绍了目前已开发成功的聚降冰片烯、反式1,4-聚异戊二烯、苯乙烯-丁二烯共聚物和聚氨酯等形状记忆树脂的性能与制备方法,探讨了它们的应用领域。  相似文献   

4.
形状记忆材料的应用与发展   总被引:2,自引:0,他引:2  
马超 《辽宁化工》2006,35(1):30-32,55
比较全面地论述了形状记忆材料的本质与类型,介绍了几种常见形状记忆材料的性能特点及其在各个领域的广泛应用,同时阐述了其现状与未来的发展前景。  相似文献   

5.
吴聂  万里鹰  李爱妹  肖春平 《化工学报》2018,69(5):2282-2289
通过自由基聚合合成了四种基于乙烯基对苯二甲酸类甲壳型液晶高分子(PBPCS,PMPCS,PDCHVT,PbiPCS)。TGA和DMA表征结果表明,这四种甲壳型液晶高分子均具有较好的热稳定性,其侧基末端基团刚性越大,相对应的片材在30~80℃温度区间刚性越大。形状记忆弯角回复测试表明:四种聚合物热压成型的片材都具有很好的形状记忆固定率,均接近100%。形状记忆回复效果与聚合物侧基的末端基团有关,侧基末端基团分别为对丁氧基苯基和环己基(对应聚合物分别为PBPCS和PDCHVT)时,片材显示出较好的形状记忆性能,形状记忆回复率分别为87%和100%。将PDCHVT通过熔融纺丝制成纤维,采用形状记忆循环DMA测试表征其形状记忆性能,结果表明PDCHVT纤维具有稳定的优异的形状记忆性能。  相似文献   

6.
形状记忆材料(SMMs)作为一种有应用前景的智能材料,在外界的机械、电、磁、光、热、酸碱度等多种刺激后发生记忆响应,近年来被应用到多种防护材料中。文章介绍了形状记忆高分子聚合物及复合形状记忆材料的形状记忆效应和作用机理,介绍了隔热阻燃防护服种类及其性能要求,论述了形状记忆材料在隔热阻燃防护服中的应用,并对形状记忆材料在隔热阻燃防护服应用中的不足与发展方向进行了展望。  相似文献   

7.
为探讨纯PTT、PTT与PET混纺、纯PET三类"形状记忆"织物以及免烫棉织物的形状记忆性能,对它们进行易塑形性能及折皱回复性能的测试,并对测试参数进行优化,研究了4种织物形状记忆性能的差异。结果表明:相较于半记忆、仿记忆织物以及免烫棉织物,纯PTT织物具有优异的形状记忆性能。  相似文献   

8.
分析了近年来国内外对医疗固定用低软化点聚合物材料结构与性能方面的研究情况,简述了形状记忆聚合物材料的形状记忆原理,介绍了医疗固定用低软化点聚合物的加工方法与性能等研究成果。并提出了目前该类聚合物材料作为医用固定材料存在的不足。  相似文献   

9.
纳米炭黑填充剂能显著改善形状记忆聚合物的机械性能和导电性能。本文综述了炭黑在形状记忆聚合物复合材料中的最新应用研究进展,详细介绍了炭黑填充型形状记忆聚合物的主要制备技术和热、电、光和化学刺激等方式下的形状回复性能,并分析了不同炭黑含量对形状记忆性能和回复机制的影响,最后对炭黑填充型形状记忆聚合物材料存在的问题、解决途径、发展、应用等进行了分析与展望。  相似文献   

10.
本发明所述形状记忆复合材料解决了目前以热塑性形状记忆聚合物作为大型太空装置、结构或部件在力学性能和耐环境性能差,承受载荷小的缺陷。形状记忆复合材料包括形状记忆热固性树脂和纤维材料。制备方法:①制热固性树脂;②涂覆纤维材料;③固化成型。本发明形状记忆复合材料具有良好的力学性能和耐环境性能,承受载荷达50~60g,100%以上条件下形状回复率高于94.5%。  相似文献   

11.
The effect of phenol end functional shape memory oligomers on the shape memory properties of an epoxy‐cyanate ester resin system was examined. The basic resin system consisted of diglycidyl ether of bisphenol A (DGEBA) cured with bisphenol A dicyanate (BADC). For conferring the shape memory properties, the switching segment (SS) components selected are α, ω‐phenol‐terminated poly(tetramethyleneoxide) (PPTMO), poly(ε‐caprolactone) (PPCL), and poly(propylene glycol) (PPPG). Epoxy‐cyanate ester blend of defined composition was analyzed for thermal, mechanical, thermo‐mechanical, and shape memory properties at two concentrations of the three SSs. The transition temperature of heavily SS loaded matrix increased in the order: PPTMO < PPCL < PPPG commensurate with crystallizability of SS segments at ambient. For same reason flexural property showed an increasing trend. This is in league with the increased crystallizability of the shape memory polymer components. The shape fixity, recovery extent, and recovery time followed a reverse order: PPPG < PPCL < PPTMO. In contrast to the alcohol terminated shape memory components, phenol terminal groups were helpful in integrating the shape memory segments into the matrix by way of reaction with both epoxy and cyanate groups. The coreaction was conducive for achieving better shape memory properties and decreasing the transition temperature. A direct relation existed between the modulus ratio and the shape recovery property. Higher concentration of the SSs caused a diminution in transition temperature but enhanced the shape memory properties, though the mechanical properties were adversely affected. The shape recovery increased with increase in temperature. All polymers possessed good mechanical properties and thermal stability. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 41196.  相似文献   

12.
A bio-based shape memory epoxy resin (DGEAPA) was synthesized from rosin to achieve the sustainability of shape memory epoxy resin, and its chemical structure was determined by FTIR and 1H NMR. For comparison, a petroleum-based epoxy, diglycidyl ester of terephthalic acid (DGT) having one benzene ring, was also synthesized. The properties, including thermal and mechanical properties, as well as shape memory properties of the epoxy resins cured with poly(propylene glycol)-bis (2-aminopropyl ether) (D230), were studied by differential scanning calorimeter, dynamic mechanical analysis, thermogravimetric analysis, tensile test, and U-type shape memory test. The effect of the stoichiometric ratio nDGEAPA/nDGT on the properties was studied as well. The thermal and mechanical properties, including thermal stability, glass transition temperature, tensile strength, and modulus of the cured epoxy systems, were found to be increased with DGEAPA incremental content, and the cured neat rosin-based epoxy system exhibited the highest properties. Both the cured rosin-based epoxy and the cured DGEAPA showed significant shape memory performance. Meanwhile, the rosin ring structure made the cured rosin-based epoxy systems display excellent shape recovery fixity, while small lower shape recovery and shape recovery rate relative to the cured neat DGT system. Therefore, the rosin-based epoxy resin has a great potential in the shape memory material applications.  相似文献   

13.
A novel series of shape memory blends of trans‐1,4‐polyisoprene (TPI) and low‐density polyethylene (LDPE) were prepared using a simple physical blending method. The mechanical, thermal and shape memory properties of the blends were studied and schemes proposed to explain their dual and triple shape memory behaviors. It was found that the microstructures played an important role in the shape memory process. In TPI/LDPE blends, both the TPI crosslinking network and LDPE crystalline regions could work as fixed domains, while crystalline regions of LDPE or TPI could act as reversible domains. The shape memory behaviors were determined by the components of the fixed and reversible domains. When the blend ratio of TPI/LDPE was 50/50, the blends showed excellent dual and triple shape memory properties with both high shape fixity ratio and shape recovery ratio. © 2017 Society of Chemical Industry  相似文献   

14.
将生物基高分子材料杜仲胶(EUG)和聚乳酸(PLA)通过动态硫化技术制备了具有形状记忆性能的热塑性硫化胶(EUG/PLA TPV)。通过扫描电子显微镜、差示扫描量热、动态力学和力学性能测试及热机械循环分析等手段分别考察了EUG/PLA TPV的微观形貌、相容性、热性能、动态力学和力学性能及形状记忆性能。结果表明,增容剂腰果酚有效改善了EUG相与PLA相之间的相容性,从而提高了EUG/PLA TPV的力学性能。当橡塑质量比为5/5时,拉伸强度为10.5 MPa,扯断伸长率达到286%,是纯PLA的约48倍。EUG/PLA TPV具备特殊的双连续相结构,可以赋予其良好的形状记忆性能,形状固定率最高达到93%左右,形状回复率最高达到98%左右。  相似文献   

15.
A series of liquefied‐MDI‐based polyurethanes having shape memory behavior, with various soft segments, chain extenders, and micro‐phase separation promoters were synthesized. Their morphology and properties were investigated in terms of thermal properties, dynamic mechanical properties, and shape recovery behavior. The results indicate that the soft segment formed with longer chain segment incline to crystallize during the cooling scans and the resulting SMPU have the higher crystallinity. Meanwhile, the chain extenders, which can enhance the polarity of hard segment, incline to have excellent shape memory properties with bigger storage modulus in rubbery state too. It was also found that the micro‐phase separation promoters have great influence on the shape memory behavior due to the enhancement of micro‐phase separation of SMPU. Furthermore, it was proved again that SMPU with longer soft segment and lower hard segment contents usually showed good shape memory behavior. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007  相似文献   

16.
A facile method to prepare triple‐shape memory polymers was developed by blending polyurethane and polylactide–polytetramethylene with well‐separated glass transition temperatures. The thermal properties of the blends were characterized using modulated differential scanning calorimetry and differential scanning calorimetry. Field emission scanning electron microscopy, Fourier transform infrared spectroscopy and wide‐angle X‐ray diffraction were used to characterize the microstructures and crystal structures of the blends. The mechanical properties were also evaluated. The versatile triple‐shape memory effect and quantitative shape memory response were evaluated by consecutive thermal mechanical experiments based on a two‐step programming process and subsequent progressive thermal recovery. The results show that the blends have phase‐separated microstructures resulting in an ability to fix two temporary shapes independently and can recover to their original shapes sequentially. The blends have excellent triple‐shape memory properties and may have some applications in multi‐shape coatings, adhesives, films and temperature sensing or actuating elements. © 2015 Society of Chemical Industry  相似文献   

17.
以反式聚异戊二烯(TPI)为基质,研究了纳米碳化硅用量对碳化硅/TPI形状记忆复合材料硫化特性、物理机械性能、热性能及形状记忆性能的影响。结果表明,随着碳化硅用量的增加,复合材料的焦烧时间和正硫化时间都逐渐缩短;拉伸强度呈现先增大后减小的趋势,硬度逐渐增大;结晶度逐渐降低,从纯TPI的16.5%下降至碳化硅用量20份(质量,下同)时的13.9%;碳化硅用量为10份时复合材料的单向形状记忆性能最好,而其双向形状记忆行为在应力为250 kPa时的形状回复率达到了最大值79.1%。  相似文献   

18.
We fabricated a series of novel shape memory composites using natural Eucommia ulmoides rubber (EUR) and polybutene‐1 (PB‐1) as basic materials for the first time. The shape memory composites were prepared via simple physical blending and chemical crosslinking methods with co‐continuous architecture and multiple shape memory behaviors. These composites and their preparation methods might be widely used in the field of heat shrinkable tubes. We studied the mechanical, thermal and shape memory properties of the composites, and proposed schemes to explain their dual and triple shape memory effects. In the EUR/PB‐1 composites, both the crosslinking network of the composites and crystalline regions of PB‐1 could function as the fixed domain, and the crystalline zones of EUR and PB‐1 could act as the reversible domain individually or jointly. The composites exhibited excellent dual shape memory properties with blending ratios of 90/10 and 80/20, and good triple shape memory properties with blending ratios of 70/30 and 60/40. © 2018 Society of Chemical Industry  相似文献   

19.
PCL based hybrid films exhibiting heat-responsive shape memory properties had been obtained by using Heptaphenyltricycloheptasiloxane Trihydroxy Silanol (T7-OH) as a cross-linker. The crystallization behaviors of the materials were studied in detail by DSC and XRD. The thermal properties of the materials were detected through TGA. The static mechanical properties, in vitro degradation and shape memory properties were also studied systematically. There was no remarkable T7-OH crystal plane diffraction peak according to XRD which indicated that T7-OH was well dispersed in the matrix. Meanwhile, according to the TGA, thermal degradation temperatures were increased significantly when T7-OH were added. It was worth noting that the materials possessed excellent shape memory properties with Rf > 97 % and Rr > 97 %.  相似文献   

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