Plasticizing effect of coconut oil on morphological, mechanical, thermal, rheological, barrier, and optical properties of poly(lactic acid): A promising candidate for food packaging
Plasticizing effect of coconut oil on morphological, mechanical, thermal, rheological, barrier, and optical properties of poly(lactic acid): A promising candidate for food packaging
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DOI：
10.1002/app.45390
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发表时间：
2017-11-05
影响因子：
3
通讯作者：
Katiyar, Vimal
中科院分区：
文献类型：
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作者：
Bhasney, Siddharth Mohan;Patwa, Rahul;Katiyar, Vimal
本研究探讨椰子油（CO）对聚乳酸的增塑作用，以评估其适用于软包装。研究了不同配比的聚乳酸-椰子油（PLA-CO）熔融共混物的形态结构、力学性能、热性能、流变性能、阻隔性能和光学性能的变化。当增塑剂含量为7wt%时，共混物的透湿率下降了58%。随着增塑剂百分比的增加，拉伸强度显示出降低的趋势，而伸长率%显示出增加的趋势。在7wt%增塑剂含量下，拉伸强度从60 MPa降低到41 MPa，伸长率%从12%增加到54%。在添加1重量%增塑剂时，分子量（M-n）和降解起始（T-onset）分别显示出6%和0.6%的降低，这完全在聚合物加工所需的允许限度内。共混物的熔体流动性能略有改善（类似于16%）时，5重量%的CO。PLA膜的透明度通过添加增塑剂得到改善。PLA-CO样品的FTIR光谱证实了PLA与椰子油之间通过氢键作用。在较高的负载量下，椰子油显示出与PLA非常有限的相容性。(C)2017 Wiley Periodicals，Inc.
This study explores the plasticizing effect of coconut oil (CO) on PLA for evaluating its suitability for flexible packaging. Changes in morphological, mechanical, thermal, rheological, barrier and optical properties of melt compounded Poly(lactic acid)-Coconut oil (PLA-CO) blend were investigated by varying the mixing ratio. Water vapor permeability of blends decreased by 58% at 7 wt % plasticizer content. The tensile strength showed a decreasing trend with increasing plasticizer percentage while the % elongation showed an increasing trend. At 7 wt % plasticizer content tensile strength decreased from 60 to 41 MPa and % elongation increased from 12% to 54%. Molecular weight (M-n) and onset of degradation (T-onset), upon 1 wt % plasticizer addition showed a reduction of 6% and 0.6%, respectively, which were well within permissible limits required for polymer processing. The melt flow properties of the blends were slightly improved (similar to 16%) upon 5 wt % addition of CO. Transparency of the PLA films was improved by addition of plasticizer. FTIR spectra of PLA-CO sample confirmed the interaction between PLA and coconut oil via hydrogen bonding. At higher loading, coconut oil shows very limited compatibility with PLA. (C) 2017 Wiley Periodicals, Inc.