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首页> 外文期刊>Journal of Applied Polymer Science >Degradation of PLA and PLA in composites with triacetin and buriti fiber after 600 days in a simulated marine environment
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Degradation of PLA and PLA in composites with triacetin and buriti fiber after 600 days in a simulated marine environment

机译：在模拟海洋环境中600天后三醋精和Buriti纤维复合材料中PLA和PLA的降解

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摘要

Poly(lactic acid) (PLA), the polymer object of this study, degrades by a biotic process after an abiotic hydrolysis process. Its degradation was evaluated after 600 days of exposure in a simulated marine environment (SME), as buriti fiber-reinforced composites having triacetin as coupling agent. Composites were obtained by extrusion and films were produced by compression molding. After between 60 and 600 days of exposure, PLA had a weight loss of 2.5%, PLA/T of 1.5%, and 10-12% of weight loss for PLA/B and PLA/B/T, respectively. PLA intercalates reduction, increase, and decrease of its crystallinity attributed to hydrolysis (up to 15 days), impairment of amorphous segments (45 days), and loss of integrity of the matrix (100-600 days), respectively. In the PLA/T composites, triacetin inhibited the diatom colonization process, having its crystallinity values increased after nearly 100 days of exposure with subsequent reduction. For samples with buriti fiber, changes in crystallinity were attributed to absorption of water and exposure of matrix amorphous segments. PLA degradation in a SME is evidently favored by the use of natural fibers since they make easier water access to the matrix and colonization by the protists group, diatoms, showing that the polymer can have reduced post-use shelf life as composites, with benefits while in use and at the same time post-use environmental benefits. Triacetin inhibits PLA colonization and degradation up to 45 days after exposure, after which it no longer influences the degradation process. (c) 2015 Wiley Periodicals, Inc.
机译：这项研究的研究对象是聚乳酸（PLA），经过非生物水解过程后，会通过生物过程降解。在模拟海洋环境（SME）中暴露600天后，评估其降解情况，该方法为具有三醋精为偶联剂的Buriti纤维增强复合材料。通过挤出获得复合材料，并通过压模生产膜。暴露60至600天后，PLA / B和PLA / B / T的失重分别为2.5％，PLA / T为1.5％和10-12％。 PLA分别由于水解（长达15天），无定形链段受损（45天）和基质完整性丧失（100-600天）而导致其结晶度降低，增加和降低。在PLA / T复合材料中，三醋精抑制了硅藻的定殖过程，在暴露近100天后其结晶度值增加，随后降低。对于具有Buriti纤维的样品，结晶度的变化归因于吸水和基质无定形链段的暴露。显然，使用天然纤维有利于中小型企业的PLA降解，因为它们可以使水更容易进入基质，并且有机硅藻类（原生硅藻）易于定殖，表明该聚合物作为复合材料可以减少使用后的保质期，同时具有优势在使用中以及在使用后同时具有环境效益。三醋精在暴露后最多45天内抑制PLA的定殖和降解，此后不再影响降解过程。 （c）2015年威利期刊有限公司

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