基于废旧涤纶纺织品的再生聚酯降解流变行为研究

A Study on the Degradation-rheological Behavior of PET Regenerated from Used Polyester Textiles

以废旧涤纶纺织品再生聚酯和原生聚酯为原料,采用Rosand RH-7型毛细管流变仪对其降解流变行为进行研究。结果表明:一定温度下降解处理后,再生聚酯和原生聚酯仍表现出典型的假塑性流动行为;与原生聚酯相比,一定温度范围内,再生聚酯在较低的温度下即开始发生降解,且降解主要发生在降解处理的前5 min;随着剪切速率的提高或者停留时间的延长,2种聚酯的△E_η均呈下降的趋势,但再生聚酯的△E_η均略大于原生聚酯的△E_η;与原生聚酯相比,再生聚酯的结构粘度指数均较大,预示再生聚酯在熔纺加工时可纺性较差。

TPET regenerated from used polyester textiles and native polyester were used as raw materials and their respective degradation-rheological behavior was studied by using Rosand RH-7 capillary rheometer. The results showed that after the degradation process at certain temperature, both materials showed a typical pseudoplastic flow behavior. Compared with native polyester, the regenerated polyester started degrading at a lower temperature, and the degradation occurred mainly within the first 5 min. of the degradation process. With the increase of shear rate or the retention time of the degradation treatment, the △E_η of both polyesters was found decreasing. Compared with the native polyester, the structural viscosity index of the regenerated polyester was relatively higher, predicting that the regenerated polyester would exhibit poor spinnability in the melt spinning process.