埃洛石纳米管改性聚乳酸复合材料的制备与性能

Preparation and Properties of Halloysite Nanotubes-reinforced Polylactic Acid Composites

以埃洛石纳米管(HNTs)为增强体,通过挤出预混的方式制备了HNTs质量分数为20%的PLA/HNTs复合材料母粒,再通过二次挤出制备了不同HNTs含量的PLA/HNTs纳米复合材料;利用万能拉力机、扫描电子显微镜、透射电子显微镜、热重分析仪、差示扫描量热仪、转矩流变仪等对复合材料的力学性能、微观形貌、结晶性能、热性能以及流变性能进行了分析。结果表明:当HNTs的质量分数不超过7%时,纳米粒子在PLA基体中具有良好的分散效果;当HNTs的质量分数为7%时,缺口冲击强度达到最大值(5.7 kJ/m^(2)),结晶度相比纯PLA提高了4.72%,热稳定性明显提高,失重5%,50%时的温度以及最大分解速率温度分别升高至337.3,364,370.7℃,复数黏度随HNTs的含量的增加逐渐减小。

Taking halloysite nanotubes(HNTs)as the reinforcement,the PLA/HNTs composite masterbatch with 20%HNTs content was prepared by extrusion premixing.And the PLA/HNTs nanocomposites with different content of HNTs were prepared by secondary extrusion.Universal tension machine,scanning electron microscopy,transmission electron microscope,thermogravimet-ric analysis,differential scanning calorimeter,torque rheometer and so on were used to study the mechanical properties,microscopic morphology,crystalline properties,thermal properties and rheological properties of PLA/HNTs nanocomposites.The nanoparticles exhibit a good dispersion effect in the PLA matrix with the content of HNTs below 7%.When the content of HNTs is 7 wt%,the impact performance of PLA/HNTs nanocomposites reaches the maximum value of 5.7 kJ/m^(2);compared with pure PLA,crystallin-ity of the PLA/HNTs nanocomposites is increased by 4.72%.And the temperature of T_(5%),T_(50%)and T_(max) reaches 337.3℃,364℃and 370.7℃respectively.The composite viscosity gradually decreases with the increase of HNTs content.