Synthesized the PA6/PEG copolymer by hydrolytic polymerization of caprolactam withPEG. Tested the Tm of the copolymer by DSC and measured the crystallization by WAXD. Stud-ied the mechanical property of the fibre, the relationship between copolymer structure and itsproperty. The research results show that the less the relative molecular weigh of PEG is, the low-er the Tm is. With the increase of the molecular weigh of PA6, the Tm increases. The existenceof PEG can raise the crystallization rate of copolymer. When the ratio of PA6 to PEG is 1 000 to1 000, the fibre has higher elongation of break.
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