Effect of PLA grades and morphologies on hydrolytic degradation at composting temperature: Assessment of structural modification and kinetic parameters
Effect of PLA grades and morphologies on hydrolytic degradation at composting temperature: Assessment of structural modification and kinetic parameters
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DOI：
10.1016/j.polymdegradstab.2013.02.005
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发表时间：
2013-05-01
影响因子：
5.9
通讯作者：
Pantani, Roberto
中科院分区：
文献类型：
--
作者：
Gorrasi, Giuliana;Pantani, Roberto
本工作的重点是不同的商业级的聚乳酸（PLA）的水解过程的研究。其目的是评估影响水解的基本因素，在水介质中在58摄氏度，即由国际标准指示的温度在堆肥过程中的生物降解，并在这样的过程中所涉及的反应的动力学常数。我们分析了具有不同D-异构体含量的PLA样品，具有无定形和半结晶结构。水解过程，作为时间的函数，通过不同的技术：pH值的变化，样品的重量（%）的变化，结晶度使用DSC分析，FTIR和WAXD研究，分子量和分子量分布GPC分析。实验数据被用来描述水解现象的动力学，假设一个自催化机制。(C)2013爱思唯尔有限公司保留所有权利。
The present work focuses on a study of the hydrolysis process of different commercial grades of polylactic acid (PLA). The aim was to evaluate the fundamental factors affecting hydrolysis in aqueous medium at 58 degrees C, namely the temperature indicated by the international standards for biodegradation during composting, and the kinetic constant of the reaction involved in such process. We analyzed samples of PLA with different D-isomer content, having amorphous and semi-crystalline structures. The hydrolysis process was followed, as function of the time, by means of different techniques: pH variation, variation of weight (%) of samples, crystallinity degree using DSC analysis, FTIR and WAXD investigation, molecular weights and molecular weight distribution by GPC analysis. The experimental data were used to describe the kinetic of hydrolysis phenomenon, assuming an autocatalytic mechanism. (C) 2013 Elsevier Ltd. All rights reserved.