For such materials the initial macromolecule tends to be a polyester or polyether; it is the crosslinks that involve the formation of a polyurethane structure.
对于这种材料的初始高分子往往是聚酯或聚醚，它是涉及聚氨酯结构的形成的交联。
The reasons for the formation of chip-skin in the polyester chip air transport process are the high air speed, high temperature and static electricity.
聚酯切片气送过程中切片皮形成的原因是风速高、温度高和有静电。
Lastly, of course, the main reaction of interest is the formation of urethane groups by reaction of isocyanate groups and hydroxy - groups of the polyester or polyether.
最后，当然，利息的主要反应是异氰酸酯基和羟基的聚酯或聚醚组反应形成聚氨酯组。
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