新型光、 热双响应形状记忆聚合物的制备与性能

通过多巴胺表面原位聚合反应修饰玻璃微珠, 利用X光电子能谱仪(XPS)和傅里叶变换红外光谱仪 (FTIR)对修饰前后玻璃微珠表面的化学组成进行了表征, 用热失重分析仪(TGA)对其热稳定性进行了测试, 并利用透射电子显微镜(TEM)和扫描电子显微镜(SEM)对其形貌进行了观察; 研究了改性玻璃微珠对形状记忆共混物聚己内酯和聚氨酯(PCL/TPU)的热性能、 力学性能和形状记忆性能的影响. 结果表明, 成功制备了表面包覆聚多巴胺的玻璃微珠(PHGM), 改性玻璃微珠的加入不仅增强了复合材料的力学性能(当改性玻璃微珠含量为3%时, 材料的拉伸强度提高到53.3 MPa, 杨氏模量提高到178.4 MPa), 还赋予了复合材料优异的光热效应. 所制备的形状记忆复合材料在808 nm近红外光的照射下, 可以在短时间内(7 s)升高到材料的开关温度并回复到初始形状.

Preparation and Properties of Novel Optical and Thermal Dual Response Shape Memory Polymers

Glass microsphere was modified by the surface in situ polymerization reaction of dopamine. The chemical composition of the glass microsphere before and after modification was characterized by X-ray photoelectron spectroscopy（XPS） and Fouried transform infrared spectroscopy（FTIR）， its thermal stability was tested by thermogravimetry（TG） and its morphology was observed by transmission electron microscope（TEM） and scanning electron microscope（SEM）； the effects of the modified glass microsphere on the thermal， mechanical and shape memory properties of the shape memory composite polycaprolactone and polyurethane（PCL/TPU） were investigated. The results show that the surface-coated polydopamine glass microsphere（PHGM） was successfully prepared， and the addition of modified glass microsphere not only enhanced the mechanical properties of the materials（the tensile strength increased to 53.3 MPa and the Young’s modulus increased to 178.4 MPa at 3% of modified glass microsphere）， but also imparted excellent photothermal effects to the materials. When the composites were exposed to 808 nm near infrared（NIR） light， they can reach their switching temperature and return to their permanent shape within a short time （7 s）.