纳米Nd2O3/TPU复合弹性体微相分离及耐热性能研究

Study on microphase separation and heat resistance of nano Nd2O3/TPU composite elastomer

采用超声–喷雾辅助水热法成功制备了单分散、直径40 nm的立方萤石结构的纳米Nd2O3,然后通过原位本体聚合技术制备了纳米Nd2O3/TPU(热塑性聚氨酯)复合弹性体。测试结果表明:纳米Nd2O3的引入能有效提高TPU的微相分离程度;当引入的纳米Nd2O3质量分数为0.5%时,TPU复合弹性体的玻璃化转变温度、热分解温度(硬段)及软化点分别达到–38.7、392.1、137.6℃,相比纯TPU提高了–9.0、33.7、39.1℃。最后,通过X射线光电子能谱(XPS)研究了纳米Nd2O3与TPU的相互作用机理,证实了纳米Nd2O3与TPU的氨基甲酸酯基团之间配位键的存在。

The nano Nd2O3 with monodispersity and diameter 40 nm cubic fluorite structure was successfully prepared by using the ultrasonic spray-assisted hydrothermal method.Then,the nano Nd2O3/TPU(thermoplastic polyurethane)composite elastomers were prepared via in-situ bulk polymerization technique.The test results show that the introduction of the nano Nd2O3 can effectively improve the microphase separation degree of TPU.When the mass fraction of the introduced nano Nd2O3 is 0.5%,the glass transition temperature,thermal decomposition temperature(hard segment)and softening point of the TPU composite elastomers achieve–38.7,392.1 and 137.6°C respectively,the–9.0,33.7 and 39.1°C are increased respectively compared with those of pure TPU.Finally,the interaction mechanism between nano Nd2O3 and TPU was investigated by using X-ray photoelectron spectroscopy(XPS),the existence of the coordination bond between the nano Nd2O3 and the carbamate group in TPU is confirmed.