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首页> 外文期刊>Journal of Applied Polymer Science >Bio-based blends from poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and natural rubber for packaging applications
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Bio-based blends from poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and natural rubber for packaging applications

机译：来自聚（3-羟基丁酸酯-CO-3-羟基戊戊烷）和用于包装应用的天然橡胶的生物基混合物

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摘要

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is a promising bioplastic but has limited packaging applications due to its brittleness and poor processability. Incorporation of highly viscous high-molecular-weight natural rubber (HMW-NR, gel extracted from NR) into PHBV can improve these properties. HMW-NR is not commercially available, impeding commercialization of the PHBV/rubber blends. Therefore, an organic peroxide was used to selectively crosslink NR to increase its viscosity during its melt blending with PHBV. The PHBV/NR blends were fabricated through a two-step extrusion process using a twin-screw extruder. The blends contained two phases with crosslinked rubber being dispersed in PHBV, and had clear rubber loading-dependent differences in performance. The thermal stability and melt strength of the blends were enhanced over pristine PHBV, indicating improved processability. The flexibility and toughness of the blends were improved by 59 and 20%, respectively, compared with pristine PHBV, and were comparable to commercial petroleum-based plastics. (C) 2018 Wiley Periodicals, Inc.
机译：聚（3-羟基丁酸酯-CO-3-羟基戊戊烷）（PHBV）是一种有前途的生物塑料，但由于其脆性和可加工性差而具有有限的包装应用。将高粘度的高分子量自然橡胶（HMW-NR，NR中提取的凝胶）掺入PHBV中可以改善这些性质。 HMW-NR不商业上可用，阻碍了PHBV /橡胶共混物的商业化。因此，使用有机过氧化物选择性地交联NR，以增加其与PHBV混合期间其粘度。通过使用双螺杆挤出机通过两步挤出工艺制造PHBV / NR混合物。混合物含有两相，交联橡胶分散在pHBV中，并且具有透明的橡胶载荷依赖性差异。在原始PHBV上增强了共混物的热稳定性和熔体强度，表明改善的加工性。与原始PHBV相比，共混物的柔韧性和韧性分别得到59％和20％，并且与商业石油基塑料相当。 （c）2018 Wiley期刊，Inc。

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