【摘要】 通过共混的方法制备了聚乳酸(PLA)和埃洛石(HNT)复合材料,并研究了HNT添加量对PLA/HNT复合材料的力学性能、热性能及微观形貌的影响。结果表明,HNT对PLA具有显著的增强效果,PLA/HNT复合材料的力学性能有很大的提高,且在HNT用量为8%时达到最佳的力学性能;但是,HNT的加入使PLA/HNT复合材料的断裂伸长率和冲击强度均有所下降;此外,HNT的加入提高了复合材料的相对结晶度和熔融温度,同时PLA/HNT复合材料的热稳定性也得到了较大的提高;PLA/HNT复合材料的断面形貌显示,复合材料的断面形貌逐渐从粗糙变得平整,复合材料从韧性断裂逐渐转变为脆性断裂。更多还原

【Abstract】 Poly(lactic acid)(PLA)/halloysite(HNT) composites were prepared by a blending method, and the effect of HNT content on the mechanical properties, thermal properties and microstructure of the composites were investigated. The results indicated that there was a significant reinforcement effect of HNT on PLA, and the mechanical properties of PLA/HNT composites were greatly improved. The optimum mechanical properties can be obtained when 8 wt % of HNT was incorporated into PLA. However, the addition of HNT led to a decrease in elongation at break and impact strength of the composites. The relative crystallinity and melting temperature of the composites were improved in the presence of HNT. The thermal stability of the composites was also improved significantly. Moreover, the morphological observation indicated that the fracture surface of the composite became smoother, indicating a transformation from ductile fracture to the brittle one.更多还原