【作者】 王宇昊； 刘天睿； 唐冬雁；

【Author】 Wang Yuhao;Liu Tianrui;Tang Dongyan;Harbin No.3 Middle School;High School Attached to Harbin Normal University;Department of Chemistry, Harbin Institute of Technology;

【机构】 哈尔滨市第三中学； 哈尔滨市师范大学附属中学； Department of Chemistry, Harbin Institute of Technology；

【摘要】 形状记忆聚合物是一类在热、电或辐射等不同驱动力下具有形状记忆能力的智能聚合材料,利用其在刺激信号作用下的形状恢复能力,可应用于航空航天、医学、探测等领域,起到不可替代的作用。以异氟尔酮二异氰酸酯和聚己内酯二元醇为原料,1,4-丁二醇为扩链剂,通过聚加成制备新型的生物相容性聚氨酯形状记忆聚合物;并通过控制合成工艺参数,使形状记忆聚合物的玻璃转化温度接近人体温度,为其应用于人体环境提供可能。用傅里叶红外光谱对聚合物的结构进行分析,考察其反应是否完全;由DSC法测定在不同扩链剂含量下形状记忆材料的玻璃化转变温度。通过形状记忆热驱动法测定,结果显示该形状记忆材料具有良好的形状记忆效应,应变回复可达到90%。进一步以DMF为溶剂,调节溶剂量,以静电纺丝法制备得到聚氨酯纳米纤维膜。通过金相显微镜观察纳米纤维膜的表面形貌,并观察不同DMF溶剂量下纺丝纤维效果,获得最佳纺丝条件。更多还原

【Abstract】 As one kind of smart material with shape memory effect drove by the external stimulus changes, such as thermo, electric or radiation, shape memory polymer has broad applications in aerospaces, medicines and detections, etal. In this paper, electrospun fibers of biocompatible polycaprolactone-based polyurethane were fabricated by the electrospinning method. The glass transitional temperatures of the synthesized polyurethane were adjusted by the technique parameters to near the physiological temperature of human body, thus the materials would have potential applications in medical fields. The constructions, the glass transitional temperatures, the morphology and the shape memory abilities of the micro/nanofibers were all detected. And the memory shape recovery could reach 90%.更多还原