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首页> 外文期刊>Journal of Polymers and the Environment >Poly[(R)-3-hydroxy butyrate] Melt Processing: Strategy for Prevention of Degradation Reactions
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Poly[(R)-3-hydroxy butyrate] Melt Processing: Strategy for Prevention of Degradation Reactions

机译：聚[（R）-3-羟基丁酸酯]熔体加工：防止降解反应的策略

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摘要

Poly[(R)-3-hydroxy butyrate] (PHB) as well as all the components of the poly[(R)-3-hydroxy alkanoate]s (PHAs) family tend to degrade during processing at temperatures above their melting point via a hydrolytic mechanism induced by moisture attack and a concerted reaction mechanism induced by temperature. Therefore, the PHAs stabilization in the molten state is particularly important for production of biodegradable ecocompatible plastic items of commercial value. In order to refrain the indicated negative degradation effects, PHB was melt processed in a torque rheometer in the presence of a polymeric carbodiimide agent. Processed specimens were characterized by using FTIR, GPC, DSC, TGA and tensile properties. GPC analysis showed that the increase of the additive content in the formulation resulted in an increase of PHB molecular weight. However, decreasing in PHB thermal stability, glass transition temperature and mechanical properties, was observed with the increase of the additive amount. This behaviour most likely arises from the formation of new chemical structures promoted by the presence of the additive aimed at preventing the onset of hydrolitic processes.
机译：聚[（R）-3-羟基丁酸酯]（PHB）以及聚[（R）-3-羟基链烷酸酯]（PHA）家族的所有组分在高于熔点的温度下加工时，往往会通过由水分侵蚀引起的水解机理和由温度引起的协同反应机理。因此，熔融状态下的PHA稳定对于生产具有商业价值的可生物降解的生态相容性塑料制品特别重要。为了避免所指示的负面降解作用，在聚合物碳二亚胺试剂的存在下，在扭矩流变仪中对PHB进行了熔融加工。使用FTIR，GPC，DSC，TGA和拉伸性能对经过加工的样品进行表征。 GPC分析表明，配方中添加剂含量的增加导致PHB分子量的增加。但是，随着添加量的增加，PHB的热稳定性，玻璃化转变温度和机械性能下降。这种行为很可能是由于旨在防止水解过程开始的添加剂的存在促进了新化学结构的形成。

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