反应流变性对嵌段聚氨酯结构与性能的影响

利用自行设计的绝热反应流变仪研究了聚氨酯（脲）快速扩链过程的反应流变性，用流变仪同时测得绝热扩链反应过程的温度和粘度对时间的关系，将绝热温升与反应热关联，显示凝胶时官能团反应程度、粘度－时间曲线和凝胶时间，可预示软硬链段微相分离程度、反应程度和微相分离程度影响着嵌段聚氨酯（脲）的结构和力学性能。

INFLUENCE OF REACTING RHEOLOGY ON STRUCTURE AND PROPERTIES OF BLOCK POLYURETHANE

The reacting rheological behavior in the process of polyurethane urea fast chain extention was studied by means of adiabatic reacting rheometer designed by ourselves. The temperature and viscosity vs time in the process of adiabatic chain extention reaction could be measured by the rheometer at the same time. Concerning the adiabatic temperature raises with reaction heat shows the reacting extent of functional groups when get to gel. The diagrams of viscosity vs time and gelling time could show the segregation extent of the soft and hard segments. The reacting extent of functional groups and segregation extent of micro phases have influence on microstructure and mechanic properties of block polyurethane urea.