Xu Qiang, Guan Bing, Guo Weihong, Liu Xiucai
Institute of Bio-Based Materials, East China University of Science and Technology, Shanghai 200237, China.
Shanghai Cathay Biotechnology Co., Ltd., Shanghai 200237, China.
Polymers (Basel). 2022 Mar 22;14(7):1280. doi: 10.3390/polym14071280.
Bio-based polyamide 56T (PA56T) is a new type of bio-based polyamide regarded as a promising material for sustainable solutions. The stabilization of PA56T compounded with Irganox 1098, Doverphos S9228, or SH3368 was studied by using a rotational rheometer and a circulating air oven at 150 °C. The thermal-oxidative aging resulted in an increase of the yellow color index of the PA56T/GF composites, which due to the carbonyl group as a chromophore group, continuously formatted during the aging process. After 10 days of aging, the mechanical properties and dynamic mechanical properties increase due to the molecular cross-linking and annealing effects. When the aging time is beyond 20 days, the degradation of molecular chain segments dominates, and the mechanical properties of PA56T/GF deteriorate continuously. The addition of antioxidants only slowed this effect and did not change the process of thermal-oxidative aging, which destroys the molecular chain. The results from both methods are consistent after a series of characterizations by FTIR, XRD, and so on. In the case of samples without lubricant, the rotational rheometer has the benefit of being less time-consuming than the accelerated aging experiment.
生物基聚酰胺56T（PA56T）是一种新型生物基聚酰胺，被视为可持续解决方案的一种有前景的材料。通过使用旋转流变仪和在150°C的循环空气烘箱，研究了与抗氧剂Irganox 1098、多佛磷S9228或SH3368复合的PA56T的稳定性。热氧化老化导致PA56T/GF复合材料的黄色指数增加，这是由于作为发色团的羰基在老化过程中持续形成。老化10天后，由于分子交联和退火效应，力学性能和动态力学性能增加。当老化时间超过20天时，分子链段的降解占主导，PA56T/GF的力学性能持续恶化。抗氧化剂的添加仅减缓了这种效应，并没有改变破坏分子链的热氧化老化过程。通过FTIR、XRD等一系列表征后，两种方法的结果是一致的。对于没有润滑剂的样品，旋转流变仪比加速老化实验耗时更少。
