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Thermal-oxidative degradation of polyamide 6,6 containing metal salts

机译：含金属盐的聚酰胺6,6的热氧化降解

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摘要

The thermal-oxidative stability of oven aged polyamide 6,6 (PA6.6) doped with Co, Cu, Ni and Zn chlorides combined with KI was examined. Aging caused a depression in melting temperature and an increase in enthalpy of fusion of PA6.6 films due to the formation of a strongly degraded crystalline fraction with a lower molecular weight. A build-up of carbonyl absorption in the range 1700-1780 cm"1 due to primary and secondary photo-oxidation products was detected. The kinetics of carbonyl accumulation was affected by the morphology of the samples, and it was observed that at a later stage of aging the crystalline phase was also involved in the oxidation process. The above mentioned changes were greatest in the case of neat Co and Ni doped polymer, suggesting that these metal salts acted as pro-oxidants. On the other hand, the use of Cu and Zn chlorides brought about a substantial increase in long-term polymer stabilization. Tensile tests revealed a large reduction in ductility as a result of aging for neat, Co and Ni doped polymer, whereas long-term retention of tensile properties was found for the polymer stabilized with Cu and Zn.The presence of the metal salts combined with KI led to increased stabilization for chlorides of Ni, and Co, owing to the participation of KI in non-radical decomposition of peroxides. No effect due to KI was observed for ZnCl_2.
机译：研究了掺有KI的Co，Cu，Ni和Zn氯化物掺杂的烤箱老化的聚酰胺6,6（PA6.6）的热氧化稳定性。老化由于形成具有较低分子量的强烈降解的结晶级分而导致熔融温度降低和PA6.6膜的熔融焓增加。检测到由于初级和次级光氧化产物而在1700-1780 cm“ 1范围内产生的羰基吸收增加。羰基积累的动力学受样品形态的影响，并且观察到稍后另一方面，在纯Co和Ni掺杂的聚合物的情况下，上述变化最大，说明这些金属盐起着助氧化剂的作用。 Cu和Zn氯化物大大提高了聚合物的长期稳定性，拉伸试验表明，纯的，Co和Ni掺杂的聚合物的老化导致延展性大大降低，而长期保持了拉伸性能。由于KI参与过氧化物的非自由基分解，金属盐与KI的结合导致Ni和Co氯化物的稳定性增加。观察到由KI引起的ZnCl_2效应。

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