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首页> 外文期刊>Journal of Applied Polymer Science >The chances of thermooxidation stabilization of poly(3-hydroxybutyrate) during processing-A critical evaluation
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The chances of thermooxidation stabilization of poly(3-hydroxybutyrate) during processing-A critical evaluation

机译：加工过程中聚（3-羟丁酸酯）热氧化稳定的机理 - 临界评价

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摘要

The performance of a series of thermooxidation stabilizers was investigated in poly(3-hydroxybutyrate) (PHB) during processing by multiple extrusion at 190 degrees C. The issue was to find out if PHB may be processing stabilized or not. Phenols of different steric hindrance, phosphites, amine oxide, hydroxylamine, lactone, hindered amine and carbodiimide were tested as potential stabilizers and their efficiencies compared with non-stabilized polymer as a reference. Multiple extrusion data was evaluated using the processing degradation index (PDI) formerly designed for polypropylene. Changes in molecular weight were monitored as well. The results have shown that none of the stabilizing structures, currently successfully used in other polymers, have the ability to protect PHB. This indirectly implies that no radical chain scission takes place during PHB processing, i.e. no thermooxidation takes place. Moreover, nearly all of the tested structures act as prodegradants in PHB, some of them very strong. The strongest ones contain P or N atoms with asymmetrical free electron pairs in their molecules that evidently accelerate the main degradation mechanism of PHB-thermally induced cis-elimination.
机译：在190°C下多次挤压加工过程中，研究了聚3-羟基丁酸酯（PHB）中一系列热氧化稳定剂的性能。问题在于，PHB是否可以加工稳定。测试了不同空间位阻的酚类、亚磷酸盐、氧化胺、羟胺、内酯、受阻胺和碳二亚胺作为潜在稳定剂，并与未稳定聚合物进行了比较。使用先前为聚丙烯设计的加工降解指数（PDI）评估多次挤出数据。分子量的变化也被监测到。结果表明，目前已成功用于其他聚合物的稳定结构中，没有一种具有保护PHB的能力。这间接意味着在PHB加工过程中不会发生自由基链断裂，即不会发生热氧化。此外，几乎所有被测试的结构在PHB中都起到前降解剂的作用，其中一些非常强。最强的含有P或N原子，其分子中具有不对称的自由电子对，这明显加速了PHB热诱导顺式消除的主要降解机制。

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