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首页> 外文期刊>Journal of Applied Polymer Science >Hydrolytic degradation of poly(1,4-butylene terephthalate-co-tetramethylene oxalate) copolymer
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Hydrolytic degradation of poly(1,4-butylene terephthalate-co-tetramethylene oxalate) copolymer

机译：聚（1,4-对苯二甲酸丁二醇酯-草酸四亚甲基酯）共聚物的水解降解

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摘要

Experimentally synthesized poly(1,4-butylene terephthalate-co-tetramethylene oxalate) (PBT-PTMO) monofilaments were evaluated for hydrolytic stability in salt water (SW) and distilled water (DW) at temperature below and above glass transition temperature (Tg), along with commercially available poly(hexamethylene adipamide) (NY), poly(ethylene terephthalate) (PET), and polypropylene (PP) monofilaments. There was no decrease in mechanical properties in case of NY, PET, and PP in either DW or SW below their Tg. The breaking strength, ultimate elongation, and thermal shrinkage of the PBT-PTMO, however, decreased as the ageing time increased. Total strength loss occurred after approximately 300 days at 25 °C in either DW and SW. This can be attributed to the chain scission that occurs in the PBT-PTMO copolymer chain. The poor hydrolytic stability of the PBT-PTMO may be attributed to the higher moisture regain. The salinity of water did not have a significant effect on the breaking strength loss of the materials. The mode of hydrolytic degradation of aged PBT-PTMO polymer was confirmed by the increasing generation of the acid carbonyl and hydroxyl groups with concomitant increasing consumption of ester groups, regardless of ageing conditions. Above Tg, the hydrolytic rate constant (k prime H, day-1) of the PBT-PTMO, estimated by the rate of formation of acid carbonyl groups, is greater at a higher ageing temperature.
机译：在低于和高于玻璃化转变温度（Tg）的温度下，评估了实验合成的聚对苯二甲酸1,4-丁二醇酯-草酸四亚甲基酯（PBT-PTMO）的单丝在盐水（SW）和蒸馏水（DW）中的水解稳定性。 ，以及市售的聚（己二酸己二酰胺）（NY），聚对苯二甲酸乙二酯（PET）和聚丙烯（PP）单丝。在DW或SW低于Tg的NY，PET和PP的情况下，机械性能均未降低。但是，随着老化时间的增加，PBT-PTMO的断裂强度，极限伸长率和热收缩率降低。 DW和SW在25°C下大约300天后发生了总强度损失。这可以归因于在PBT-PTMO共聚物链中发生的断链。 PBT-PTMO的较差的水解稳定性可能归因于较高的回潮率。水的盐度对材料的断裂强度损失没有显着影响。老化的PBT-PTMO聚合物的水解降解方式可以通过增加酸羰基和羟基的生成以及相应的酯基消耗量的增加来确定，而与老化条件无关。高于Tg时，在较高的老化温度下，通过酸性羰基的形成速率估计的PBT-PTMO的水解速率常数（kprim H，第1天）更大。

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