PLA/黄麻复合层压材料的降解性能分析

Analysis of degradation properties of PLA/jute multi-layer composites

为分析PLA/黄麻复合层压材料的可降解性能,通过考察该复合材料在不同pH值时PBS缓冲溶液降解过程中的吸水率、质量损失率和拉伸强度变化,研究其随降解时间变化的降解特性。结果表明:复合材料的吸水率、质量损失率与PBS缓冲溶液pH值、降解时间有一定的依存性,在弱碱性、弱酸性和中性等介质中表现出不同的降解速率,随着降解时间的增加其吸水率、质量损失率增大,拉伸强度降低;经80 d降解,复合材料的拉伸强度明显降低,在碱性、酸性和中性环境中其拉伸强度分别下降80%、75%和60%,具有良好的降解性能。

In order to investigate the degradation behavior of PLA/jute multi-layer composites, they were treated with buffer solution at various pH value. Relationship of degradation time with water absorption rate, mass loss rate and tensile strength of the composites were studied. The results showed that the water absorption rate and mass loss rate of the composites are dependent to a certain extent on the pH value of buffer solution and degradation time. Their degradation rate differs in weak alkali, weak acid and neutral media. Increasing degradation time increases the water absorption and mass loss but decreases tensile strength of the PLA/jute composites. After 80 days＇ degradation, the tensile strength of the composites has decreased by 80% , 75%, 60% in alkali, acid, neutral media respectively. The composites have good degradation property.