This paper reports the study of embrittlement of PBT submitted either to thermal or hydrolytic ageing. All changes were followed up by tensile tests, rheometry in molten state and gel permeation chromatography for molar mass changes, SAXS and DSC experiments for crystallinity changes. Both kind of ageing were shown to induce predominant chain scissions with moderate crystallinity increase, in great part due to annealing. The combination of all results were used to establish a M_{w -} χ_c embrittlement window helping for a determination of an end of life criterion.

中文翻译：

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氧化和水解老化引起的PBT可塑性损失

本文报道了热老化或水解老化对PBT脆化的研究。所有的变化都进行了拉伸试验，熔融状态的流变学和凝胶渗透色谱法（用于摩尔质量变化），SAXS和DSC实验（用于结晶度变化）。两种老化都显示出主要的链断裂，且结晶度适度增加，这在很大程度上归因于退火。所有结果的组合被用来建立A M _{W -} χ _ç脆化窗口帮助生活标准的最终的确定。