Ternary PLA-PHB-Limonene blends intended for biodegradable food packaging applications
Ternary PLA-PHB-Limonene blends intended for biodegradable food packaging applications
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DOI：
10.1016/j.eurpolymj.2013.11.009
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发表时间：
2014-01-01
影响因子：
6
通讯作者：
Rayon, Emilio
中科院分区：
文献类型：
--
作者：
Arrieta, Marina P.;Lopez, Juan;Rayon, Emilio
在这项工作中，聚乳酸和聚羟基丁酸酯PHB与天然萜烯D-柠檬烯(LIM)共混并增塑，目的是提高聚乳酸的结晶度，并获得用于食品包装的柔性薄膜。材料被熔融混合，并在透明薄膜中加工。对其结构和表面性能进行了评价。此外，还通过量热参数、透氧率和耐水性测试等手段研究了其功能性质。此外，还对其热稳定性、结晶行为、力学性能和纳米力学性能进行了研究。红外光谱显示了聚乳酸和聚羟基丁酸乙酯的特征谱带及其较强的分子相互作用。PY-GC/MS显示D-柠檬烯的特征峰以及聚乳酸和聚羟基丁酸的热降解产物。在加入PHB的样品中，加工后的D-柠檬烯含量较高。PHB在聚乳酸中起到了增强作用，从而改善了聚乳酸的阻氧性能和表面耐水性。此外，扫描共聚焦显微镜表面图像显示PHB晶体分散在聚乳酸基质中。研究了增塑工艺对力学性能的影响，发现D-柠檬烯的加入提高了材料的断裂伸长率。还研究了堆肥条件下的腐解性，发现PHB延缓了堆肥条件下聚乳酸的分解，而D-柠檬烯则加速了它的分解。总而言之，在结构、热学、阻隔性和力学性能方面，三元聚乳酸-PHB-Lim薄膜都是最好的。(C)2013爱思唯尔有限公司。保留所有权利。
In this work poly(lactic acid) PLA, and poly(hydroxybutyrate) PHB, were blended and plasticized with a natural terpene D-limonene (LIM) with the dual objective to increase PLA crystallinity and to obtain flexible films intended for food packaging applications. Materials were melt-blended and processed in transparent films. Structural and surfaces properties were evaluated. Moreover, functional properties were studied by means calorimetric parameters, oxygen permeation and water resistant measurements. In addition, thermal stability, crystallization behavior, mechanical as well as nanomechanical properties were investigated. FTIR spectra showed the characteristic bands corresponding to PLA and PHB and their rather molecular interaction. Py-GC/MS showed the characteristics peak of D-limonene as well as the thermal degradation products of PLA and PHB. D-limonene amount after processing was higher in PHB incorporated samples. PHB produced a reinforcing effect in PLA matrix and therefore an improvement in the oxygen barrier properties and the surface water resistance. Moreover, Scanning Confocal Microscopy surface images showed the dispersion of PHB crystal in PLA matrix. The influences of plasticization process on the mechanical properties showed that D-limonene provoked an increase in elongation at break. Disintegrability under composting conditions was also investigated and it was observed that PHB delays the PLA disintegrability under composting while D-limonene speed it up. In brief, the best results regarding structural, thermal, barrier and mechanical properties were found for the ternary PLA-PHB-LIM film. (C) 2013 Elsevier Ltd. All rights reserved.