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首页> 外文期刊>Journal of Applied Polymer Science >Film blowing of PHBV blends and PHBV-based multilayers for the production of biodegradable packages
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Film blowing of PHBV blends and PHBV-based multilayers for the production of biodegradable packages

机译：PHBV共混物和基于PHBV的多层膜的吹膜生产可生物降解包装

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Poly(hydroxy butyrate-co-valerate) (PHBV) is a biodegradable polymer that is difficult to melt process into films. Such difficulty is mirrored in the lack of literature on film blowing of PHBV- or PHBV-based materials. To circumvent this problem, 70/30 wt % blends of PHBV with a biodegradable compound (PBSebT), or with poly(butylene adipate-co-terephtalate) (PBAT), were prepared and tested for extrusion film blowing. Both blends showed a similar rheological pattern at 175 degrees C, which is the maximum processing temperature with tolerable thermal degradation. Blending stabilized the film bubbles, thus widening the processing window. However, film properties such as tensile modulus, strain at break and tear resistance remained isotropic and crystallinity characteristics in the machine and transverse directions were generally similar. To bypass the thermal degradation associated with polymer blending, PHBV/PBAT films were coextruded. These showed enhanced functional properties when compared with films blown from blends. The mechanical properties of bilayered films matched those of films blown from commercial PBAT designed for food packaging. (C) 2015 Wiley Periodicals, Inc.
机译：聚（羟基丁酸-共-戊酸酯）（PHBV）是一种可生物降解的聚合物，很难将其熔融成膜。缺乏基于PHBV或基于PHBV的材料吹膜的文献反映了这种困难。为了避免该问题，制备了PHBV与可生物降解的化合物（PBSebT）或与聚（己二酸丁二酯-对苯二甲酸对苯二甲酸酯）（PBAT）的70/30 wt％的共混物，并进行了吹塑薄膜吹塑测试。两种共混物在175℃时都显示出相似的流变模式，这是具有可忍受的热降解的最高加工温度。混合稳定了薄膜气泡，从而扩大了加工范围。但是，诸如拉伸模量，断裂应变和抗撕裂性的膜性质保持各向同性，并且在纵向和横向上的结晶度特性通常相似。为了绕过与聚合物共混相关的热降解，将PHBV / PBAT薄膜共挤出。与由共混物吹制的薄膜相比，这些薄膜显示出增强的功能性能。双层薄膜的机械性能与为食品包装设计的商用PBAT吹塑薄膜的机械性能相匹配。 （C）2015年Wiley Periodicals，Inc.

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