【作者】 孟兵；

【导师】 吴智华；

【作者基本信息】 四川大学 ， 材料加工工程， 2006， 硕士

【摘要】 本文以热塑性弹性体SEBS和聚烯烃LDPE、HDPE、PP为主要原料，采用一步和分步硫化工艺方法制备聚烯烃／SEBS共混型形状记忆聚合物(SMP)。通过DSC、SEM、偏光显微镜、WXRD分析，测试试样力学性能和凝胶度，研究聚烯烃组成、填料种类与用量、硫化工艺、交联体系对聚烯烃／SEBS共混型SMP凝聚态结构、记忆性能和综合性能的影响，探索聚烯烃／SEBS共混型SMP结构-性能-加工关系。本文主要结论如下： 一、聚烯烃／SEBS共混型SMP的凝聚态结构和性能很大程度上取决于硫化工艺。分步硫化获得的SMP因具有互穿网络结构，记忆性能优良，回复性能好。一步硫化获得的SMP因为海岛结构，记忆性能较差。 二、共混树脂通过作用于互穿网络结构微区结构，影响共混型SMP的记忆性能。LDPE／SEBS(25／25)共混型SMP的综合性能较好，结晶度(约45％)适中，在100℃热水中的回复率为96％，室温(20℃)固定率83％。PP／SEBS(25／25)共混型SMP互穿网络结构中各相区尺寸细小均匀，虽然回复率较LDPE／SEBS(25／25)共混型SMP低，仅80％，但是固定率最高为96％。HDPE／SEBS(25／25)共混型SMP互穿结构各相粗大，回复率、固定率较低。 三、SEBS含量对共混型SMP记忆性能有显著的影响。增加SEBS含量，LDPE／SEBS共混型SMP形状回复率增加；形状固定率先缓慢后快速降低；当SEBS含量60％时，固定率只有80％左右。SEBS含量为30～40％综合性能最宜。 四、分步硫化中第一步硫化时DCP用量对SMP回复率、形状固定更多还原

【Abstract】 Shape memory polymer Alloy (SMPA) based on thermoplastic elastomer Styrene-ethylene-butadiene-styrene block copplymer (SEBS) and polyolefin (LDPE, HDPE and PP) were prepared by two processing map: one step way and step-by-step. One step way which Direct blended the SEBS and plyolefin; step-by-step way which SEBS was first dynamic vulcanized, then blending it with polyolefin (LDPE, HDPE and PP). Their mechanical properties and memory capability were investigated. The effect of the formulateion, filling, vulcanization, processing and curving system on condensed state, memory capability and comprehensive properties of SEBS matrix SMPA were further searched. The morphology of SEBS matrix SMPA were observed by using DSC, polarization microscope, SEM and WXRD. Our goal is to investigate the relationship of SEBS matrix polyolefin SMPA among microstructure, properties and processing. The following conclusions can be drawn from the paper:1. The morphology and properties of SEBS matrix polyolefin SMPA was obviously affected by vulcanization process. The special IPN microstructure can be gained by Step-by-step vulcanization process, which has good recovery capability and fixity. But only normal sea and island structure can be got by one step vulcanization, which memory property iwas not good;2. Different polyolefin SEBS matrix SMPAs has different recovery capability and different condense state structure. LDPE/SEBS (25/25) has excellent overall memory capability. Recovery rate of it was 96% in boiling water更多还原