PCL/Fe_3O_4复合材料的制备及其磁致形状记忆性能研究

Preparation and shape memory effect of PCL/Fe_3O_4 composites

研究了三羟甲基丙烷三丙烯酸酯(TMPTA)类多官能团物质对聚己内酯(PCL)的强化辐射交联效应。添加了TMPTA后的PCL辐射交联规律不再遵从Charlesby-Pinner关系式,而是符合陈欣方-刘克静-唐敖庆关系式。研究了两种粒径及不同Fe3O4量对于复合材料力学性能和形状记忆性能的影响。结果表明:Fe3O4的加入量并没有降低复合材料的拉伸强度,但随着Fe3O4量的增加,断裂伸长率明显降低,材料回复时间减小。最后测试了复合材料在交变磁场诱导加热过程中的形状记忆性能。表明复合材料可以通过磁场诱导间接加热实现形状记忆回复,并随着Fe3O4含量和磁场强度的增加,回复速率越快,产热效率越高。

The enhanced effects of trihydroxymethylpropyl trimethylacrylate （TMPTA） on radiation crosslinking of PCL were investigated. It was revealed that the radiation cross-linking of PCL with additive of TMPTA wasn＇t in correspondence with the classic Charlesby-Pinner equation, but followed Chen-Liu-Tang relation. The influence of Fe3O4 of two particle sizes and different contents on mechanical properties and shape memory effect of the compos- ites were studied. The results showed that Fe3O4 with an extent of 5 to 30phr did not cause the decline of the tensile strength of the composite sample. But with the increment of Fe3O4 content, the elongation at break of the composites decreased obviously and the recovery time was also reduced. Finally the interesting shape memory behavior of this composites induced by an ultrasonic alternating magnetic field was also tested. The results showed that with the in- crement of Fe3O4 content and magnetic field intensity, the composites exhibited a faster recovery rate and a higher ef- ficiency of heat production.