【摘要】 引入一种有机无机复合成核剂CH-S04用于提高增强聚乳酸（PLA）超细纤维力学性能。研究了不同纺丝温度、纺丝电压条件下PLA/CH-S04纤维膜的非等温结晶行为和CH-S04在多级牵伸工艺中的作用机理，并对PLA/CHS04纤维膜的力学性能进行了测试与表征。结果表明：当纺丝温度为220℃、纺丝电压为50 kV时，PLA/CH-S04纤维膜的结晶度分别达到最大值26.61%和32.32%，较于纯PLA纤维膜结晶度分别提升18.02%和23.73%；在不同的纺丝接收形式中，施加电压与气流辅助并且用辊子收集，CH-S04对PLA的结晶性能提升效果最佳，结晶度为36.66%，较于纯PLA纤维膜结晶度提升了28.07%；当纺丝温度为240℃，纺丝电压为50 kV时，PLA/CH-S04纤维膜拉伸强度为12.33 MPa，较于纯PLA纤维膜提高11.58%。更多还原

【Abstract】 In this study, an organic-inorganic compounded nucleating agent(CH-S04) was used to enhance the mechanical properties of poly(lactic acid)(PLA) microfibers. The non-isothermal crystallization behavior of the resultant PLA/CH-S04 fiber films as well as the action mechanism of CH-S04 in the multistage drafting process were studied under different spinning temperatures and voltages, and their mechanical properties of PLA/CH-S04 fiber films were characterized. The results indicated that when the spinning temperature was 220 ℃ and the spinning voltage was 50 kV, the degrees of crystallinity of PLA/CH-S04 fiber films reached maximum values of 27. 12 % at a spinning temperature of 220 ℃ and 32. 32 % at a spinning voltage of 50 kV, which were 18. 53 % and 23. 73 % higher than that of pure PLA fiber film, respectively. In different spinning receiving forms, CH-S04 achieved the best crystallization enhancing effect on PLA when applying voltage and air flow together with collecting by a roller. The resulting PLA/CH-S04 fiber film obtained a degree of crystallinity of 36. 66 %, which was 28. 07 % higher than that of pure PLA fiber film. The PLA/CHS04 fiber film obtained tensile strength 12. 33 MPa at a spinning temperature of 240 ℃ and a spinning voltage of 50 kV, which was 11. 58 % higher than that of pure PLA fiber film.更多还原