共聚酯型热熔粘结纤维结晶结构及其熔融行为

采用DSC与WAXD相结合的方法研究了两个系列的无规嵌段共聚酯型热熔粘结纤维的结晶结构并探讨了系列样品的熔融行为.实验表明,以最低熔融温度为界,可将样品分为两组,每组只含一种可结晶单元的结晶.其结构与物理机械性质随该可结晶单元的加入量而有规律的变化.纤维的粘结性能则取决于非晶区结构,非晶区分子链柔性增加,会明显改善粘结效果.

THE CRYSTALLINE STRUCTURES AND MELTING BEHAVIOR OF HOT-MELTING ADHESIVE FIBERS OF COPOLYESTER TYPE

The crystalline structures of the hot-melting adhesive fibers of two series of copolyesters have been studied by wide angle X-ray diffractive technique. Their melting behavior has been investigated by Differential Scanning Calorimetry(DSC). The mechanism of the lowest melting behavior in the series was revealed. The experiments indicated that in most cases, the crystallization in fibers was carried out from one type of the structural repeat units in fibers.The fibrous samples in each series can be divided into two parts according to the lowest melting temperature. The melting point fusion heat and crystallinity of the fibrous samples in each part changed regularly with varying mol% of 1,6-haxane diol to 1,4-butane diol in the mi-tial monomer feed. The mechanical properties of fibers were related to their crystallinity. While the not-melt adhesive performance was dependent on the non-crystalline region in the fibers. The adhesive effect was improved greatly with increasing the content of flexible component in non-crystalline region in the fibers.