摘要
聚(ε-己内酯)(PCL)是一种半结晶性聚合物,由于其具有良好的可降解性和形状记忆性能,PCL的改性被广泛关注和研究。通过分子交联的方式将氢醌-双(β-羟乙基)醚(HQEE)引入一种具有树枝状拓扑结构的PCL基形状记忆聚氨酯。其中,六亚甲基二异氰酸酯作为固化剂、三羟甲基丙烷(TMP)作为交联剂。用傅里叶变换红外光谱分析、X射线衍射光谱分析、热重分析、差示扫描量热分析和形状记忆性能分析表征所制备的形状记忆聚氨酯(SMPU)。分析结果表明,异氰酸酯(—NCO)活性基团全部参与反应,成功制备得到SMPU试样。所制备的SMPU均具有结晶性,且其结晶性能随扩链剂(HQEE和三甲基戊二醇)含量的升高而降低,热降解性能良好,在30.9~40.2℃范围内出现结晶/熔融峰,形状回复率均为100%,形状固定率和形状回复时间均随扩链剂含量的增大而减小。综合分析得到,试样SMPU-H2和SMPU-H3的结晶性能适中,表现出良好的形状记忆性能。其中,SMPU-H2和SMPU-H3的硬段含量分别为38.51%和46.39%,形状记忆转变温度分别为35.5,34.7℃。
Poly(ε-caprolactone)(PCL)is a semi-crystalline polymer.Because of its good degradability and shape memory performance,the modification of PCL has been widely concerned and studied.Hydroquinone-bis(β-hydroxyethyl)ether(HQEE)was introduced into a poly(ε-caprolactone)(PCL)-based shape memory polyurethane with dendritic topology by molecular cross-linking.Hexamethylene diisocyanate was used as curing agent and trimethylolpropane as crosslinking agent.The prepared shape memory polyurethane(SMPU)was characterized by Fourier transform infrared spectroscopy,X-ray diffraction spectroscopy,thermogravimetry,differential scanning calorimetry and shape memory performance.The results show that all the isocyanate(—NCO)active groups participate in the reaction and SMPU samples are successfully prepared.The prepared SMPU are crystalline,and their crystallization performance decrease with the increase of chain extender(HQEE and 2,2,4-trimethyl-1,3-pentanediol)content.The thermal degradation performance is good,and the crystallization/melting peak occurr in the range of 30.9-40.2℃.The shape recovery ratio is 100%.The shape fixation ratio and shape recovery time decrease with the increase of chain extender content.The results show that the crystallization of SMPU-H2 and SMPU-H3 is moderate,and they have good shape memory performance.The hard segment content of SMPU-H2 and SMPU-H3 is 38.51%and 46.39%,respectively,and the shape memory transition temperature is 35.5℃and 34.7℃,respectively.
作者
刘佩佩
关静
曾鑫志
于佳宏
张彦飞
LIU Peipei;GUAN Jing;ZENG Xinzhi;YU Jiahong;ZHANG Yanfei(College of Materials Science and Engineering,North University of China,Taiyuan 030051,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2024年第5期7-13,共7页
Engineering Plastics Application
