Polyether prepolymers are made by reacting a polyoxyalkylene having a star-shaped molecule with at least 3 terminal -OH groups and an N-chlorocarbonyl lactam; the prepolymer has the formula:
wherein R is derived from a polyhydric alcohol or polyvalent amino compound; R2 and R3 are each an aliphatic hydrocarbon residue; n is a number, preferably 7to 1,000, andp is an integer of 3 or more.
The polymer is reacted in the presence of an anionic catalyst with a lactam; the resultant copolymer is of the formula:
where R4 is an aliphatic hydrocarbon residue, k is 0 or 1, and m is a number.
The copolymer can be formed to shape, e.g. a sheet, and has good physical properties including impact strength and freedom from yellowing.
聚醚预聚物是由具有至少 3 个末端-OH 基团的星形分子的聚氧亚烷基和 N-
氯羰基内酰胺反应而成;预聚物的
化学式为: 其中 R 源自多元醇或多价
氨基化合物;R2 和 R3 各为脂肪族烃残基;n 为数字,最好为 7 至 1,000;p 为 3 或 3 以上的整数。 聚合物在阴离子催化剂存在下与内酰胺反应;得到的共聚物的
化学式为: 其中 R4 为脂肪族烃残基;k 为 0 或 1;m 为数字。共聚物可制成片状等形状,并具有良好的物理性能,包括抗冲击强度和不黄变。