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Properties of Graphene/Shape Memory Thermoplastic Polyurethane Composites Actuating by Various Methods

机译：各种方法致动的石墨烯/形状记忆热塑性聚氨酯复合材料的性能

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Shape memory behavior of crystalline shape memory polyurethane (SPU) reinforced with graphene, which utilizes melting temperature as a shape recovery temperature, was examined with various external actuating stimuli such as direct heating, resistive heating, and infrared (IR) heating. Compatibility of graphene with crystalline SPU was adjusted by altering the structure of the hard segment of the SPU, by changing the structure of the graphene, and by changing the preparation method of the graphene/SPU composite. The SPU made of aromatic 4,4′-diphenylmethane diisocyanate (MSPU) exhibited better compatibility with graphene, having an aromatic structure, compared to that made of the aliphatic hexamethylene diisocyanate. The finely dispersed graphene effectively reinforced MSPU, improved shape recovery of MSPU, and served effectively as a filler, triggering shape recovery by resistive or IR heating. Compatibility was enhanced when the graphene was modified with methanol. This improved shape recovery by direct heating, but worsened the conductivity of the composite, and consequently the efficiency of resistive heating for shape recovery also declined. Graphene modified with methanol was more effective than pristine graphene in terms of shape recovery by IR heating.
机译：通过各种外部驱动刺激，例如直接加热，电阻加热和红外（IR）加热，研究了利用熔化温度作为形状恢复温度的石墨烯增强的结晶形​​状记忆聚氨酯（SPU）的形状记忆行为。通过改变SPU的硬链段的结构，通过改变石墨烯的结构以及通过改变石墨烯/ SPU复合物的制备方法，来调节石墨烯与结晶SPU的相容性。与由脂肪族六亚甲基二异氰酸酯制成的SPU相比，由芳香族4,4'-二苯基甲烷二异氰酸酯（MSPU）制成的SPU与具有芳族结构的石墨烯表现出更好的相容性。细分散的石墨烯有效地增强了MSPU，改善了MSPU的形状恢复，并有效地用作了填料，通过电阻加热或IR加热触发了形状恢复。当石墨烯用甲醇改性时，相容性得到增强。通过直接加热改善了形状恢复，但是恶化了复合材料的导电性，因此电阻加热用于形状恢复的效率也下降了。就通过IR加热的形状恢复而言，用甲醇改性的石墨烯比原始石墨烯更有效。

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