热塑性淀粉共混改性PBAT纤维的制备及其性能研究

Preparation and properties of thermoplasticstarch blend modified PBAT fiber

针对聚己二酸丁二醇酯-对苯二甲酸丁二醇酯(PBAT)在熔融纺丝时易发生热熔黏连、纤维强度低等问题,通过共混改性的方法引入热塑性淀粉(TPS),制备了TPS质量分数为1%、5%、10%的PBAT/TPS共混切片及共混纤维,对PBAT/TPS共混切片的稳定性、熔融结晶性能及共混纤维的形貌结构、力学性能和回弹性能进行了表征。结果表明:质量分数为1%、5%的TPS能够在PBAT中实现均匀分散,且TPS在PBAT中能够起到结晶成核剂的作用,提升PBAT结晶温度与结晶速率,同时TPS的多羟基结构能够连接起PBAT的分子链,提升PBAT熔体的稳定性与可纺性;在共混纺丝中,添加TPS质量分数为1%、拉伸倍数为2.4时,PBAT/TPS共混纤维表现出较好的力学性能及回弹性能,断裂强度达2.2 cN/dtex,断裂伸长率为96.8%,在30%定伸长下弹性回复率达97.67%。

In view of the problems of polybutylene adipate-butylene terephthalate(PBAT)during melt spinning,such as hot melt adhesion and low fiber strength,thermoplastic starch(TPS)was introduced by blend modification to prepare PBAT/TPS blend chips and fibers with 1%,5%and 10%TPS by mass fraction.The stability and melt crystallization performance of PBAT/TPS blend chips and the morphology,mechanical properties and resilience of the blend fibers were characterized.The results showed that TPS could be uniformly dispersed in PBAT at a mass fraction of 1%and 5%and could act as a crystallization nucleating agent in PBAT to improve the crystallization temperature and crystallization rate of PBAT,meanwhile,the polyhydroxy structure of TPS could connect the molecular chain of PBAT and improve the stability and spinnability of PBAT melt;and the PBAT/TPS blend fiber showed good mechanical properties and resilience,including a breaking strength of 2.2 cN/dtex,elongation at break of 96.8%and an elastic recovery of 97.67%at 30%constant elongation,when the mass fraction of TPS was 1%and the draw ratio was 2.4.