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首页> 外文期刊>Journal of Polymers and the Environment >Compatibilizer Acidity in Coir-Reinforced PLA Composites: Matrix Degradation and Composite Properties
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Compatibilizer Acidity in Coir-Reinforced PLA Composites: Matrix Degradation and Composite Properties

机译：椰壳纤维增强PLA复合材料的相容剂酸度：基体降解和复合材料性能

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摘要

Coir fibers are lignocellulosic fibers extracted from the outer husk of a coconut, known for their versatility and low cost. This study assessed the feasibility of producing coir reinforced poly(lactic acid) (PLA) composites and the use of maleic anhydride grafted PLA (PLA-g-MA) as compatibilizer. Composites were produced in a twin-screw extruder and the mechanical properties were evaluated by tensile, flexural and heat deflection temperature tests. The morphological properties were assessed by scanning electron microscopy (SEM). The effect of compatibilizer and fiber content on molar mass of the composites was assessed by means of size-exclusion chromatography. SEM images showed that addition of the compatibilizer improved interfacial adhesion. However, this finding was not reflected in the mechanical properties because the high acidity content of the compatibilizer, revealed by titration of acid groups, along with the residual moisture of the fibers, significantly decreased molar mass of the polymer, impairing the composite matrix properties.
机译：椰壳纤维是从椰子的外皮中提取的木质纤维素纤维，以其多功能性和低成本而著称。这项研究评估了生产椰壳增强聚乳酸（PLA）复合材料的可行性，以及使用马来酸酐接枝的PLA（PLA-g-MA）作为增容剂的可行性。在双螺杆挤出机中生产复合材料，并通过拉伸，弯曲和热变形温度测试评估机械性能。通过扫描电子显微镜（SEM）评估形态学性质。增容剂和纤维含量对复合材料摩尔质量的影响通过尺寸排阻色谱法进行评估。 SEM图像表明，相容剂的添加改善了界面粘合力。然而，该发现未反映在机械性能中，因为通过酸基的滴定显示出的相容剂的高酸度含量，以及纤维的残留水分，显着降低了聚合物的摩尔质量，从而损害了复合基质的性能。

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