交联剂对聚醚酰胺弹性纤维力学性能的影响

采用两步法工艺路线,以PA6齐聚物、聚醚和少量交联剂为原料共聚合成聚醚酰胺热塑性弹性体(TPAE)。对TPAE进行模拟纺丝,对初生纤维进行拉伸和热定型。测定了纤维的力学性能。利用WAXD分析了交联剂对TPAE结晶性能的影响,讨论了纤维弹性及回复率与纺丝条件、交联剂用量的关系。结果表明,随交联剂含量的增加,拉伸丝较初生丝的结晶度提高幅度小,交联剂的化学交联作用明显。交联剂的引入使TPAE纤维断裂强度和弹性回复率提高,断裂伸长率降低,交联剂质量分数(相对PA6)为0.7%时,TPAE纤维的弹性回复率可提高到95%以上。

Effect of crosslinking agent on mechanical properties of polyether amide elastic filaments

Polyether amide thermoplastic elastomer( TPAE) was synthesized via two-step process by using PA6 oligomer and PEG as primary material and a fixed amount of crosslinking agent. The spinning, drawing and heat setting process of the copoly-elastomer were simulated. The mechanical properties of the fiber was measured. The effect of crosslinking agent on polyether amide crystallinity was studied by WAXD. The dependence of elasticity and elastic recovery of the filament on the spinning conditions and crosslinking agent content was discussed. The results showed that the crystallinity of as-spun fiber was increasing much greater than that of drawn fiber while increasing crosslinking agent. The function of the crosslinking agent was distinct. The addition of crosslinking agent can improve fiber breaking strength and elastic recovery and decrease elongation at break. The elastic recovery of this elastic filament can be above 95% when the content of crosslinking agent was 0. 7% based on PA6 weight mass.