以聚六亚甲基碳酸酯二醇和聚四亚甲基醚二醇为基的聚氨酯的合成与性能

SYNTHESIS AND PROPERTIES OF POLYURETHANE BASED ON POLY HEXAMETHYLENE CARBONATE DIOL AND POLY TETRAMETHYLENE ETHER GLYCOL

以聚六亚甲基碳酸酯二醇（ＰＨＭＣＤ）和聚四亚甲基醚二醇（ＰＴＭＥＧ）、４．４′一对二苯基甲烷二导氰酸酯（ＭＤＩ）及１．４－丁二醇（ＢＤＯ）合成线型聚碳酸酯聚氨酯．研究了其软段相的Ｔｇ、力学性能和流变特性．结果表明随ＰＨＭＣＤ含量增大，聚合物的拉伸强度增加。

A segment polyurethane elastomer (SPU) based on poly (hexamethylene carbonate) diol,PHMCD (with Mn=1380 gmol-1 hydroxy number 81 mg KOHg-1), poly (tetramethylent ether) glycol, PTMEG (Mn= 1040 gmol-1 , hydroxy number 108 mg KOH g-1), 4.4′-methylene his (p--phenytsocyanate.MDI) and l, 4-butanediol, BDO was synthsized. Studies on physical and mechanical properties reveal that along with an increase in PHMC content of soft segment component glass transition temperature of soft segment Tgs, shifts to high temperature that is coincided to enhancements in density, hardness and tensile strength and decrease in elongation st break and resilience. Moreover, the apparent viscosity of the non-Newtonian SPU melt at 180℃ is a function of shear rate and is PHMCD content dependent, so the rheologic data show that the processing characteristic of SPU containing PHMCD component in its. soft segment is superior to that of elasomer without PHMCD.