聚乳酸/聚(3-羟基丁酸酯-co-3-羟基戊酸酯)共混纤维的结构及其织物染色性能

聚乳酸(PLA)与聚(3-羟基丁酸酯-co-3-羟基戊酸酯)(PHBV)共混纺丝是改善聚乳酸(PLA)纤维的耐热性和柔韧性的方法之一。为了揭示共混纤维结构对其织物染色性能的影响规律，借助热重分析仪、差示扫描量热仪、X射线衍射仪等手段分别对共混纤维和PLA纤维的微结构和热性能进行分析。采用高、中、低温3类分散染料，对2类纤维织物的染色升温速率曲线、提升性和各项染色牢度等性能进行了比较。结果表明：共混纤维中PLA与PHBV两相分离，PLA相具有与PLA纤维相似的晶型结构，其结晶度较高，而PHBV相中形成较低的结晶；与PLA纤维相比，共混纤维的熔点较高，玻璃化温度稍低，因此其能在较低的温度下达到上染平衡；在相同的染色条件下，共混纤维织物的表观染色深度几乎是PLA织物的2倍；2类纤维织物的耐皂洗色牢度性能均不够理想。

Structure of polylactide/poly(3-hydroxybutyrate-co-3-hydroxylvalerate) blend fibers and dyeing properties for their fabrics

Objective In order to improve the heat resistance and flexibility of polylactic acid (PLA) fibers, the polylactide (PLA)/3-hydroxybutyrate-co-3-hydroxyl valentate (PHBV) blend fibers is one of the wildly used methods which received increasing attention. The literature for their preparation process, microstructure and mechanical properties were frequently found. But the relationship between the microstructure and dyeing properties lacked systematic investigation. The aim of this work is to explore the effect of structure for PLA/PHBV blend fibers on the dyeing properties of disperse dyes for their fabrics with a comparison to that of PLA fibers.