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采用熔融共混法制备凹凸棒石(ATT)质量分数分别为1%、3%和5%的ATT/聚乳酸(PLA)纳米复合材料,研究了ATT/PLA纳米复合材料的力学性能和流变性能。红外光谱分析结果表明:ATT与PLA基体之间存在较强的相互作用,使得二者之间具有较好的相容性。当ATT含量低于5%时,其可均匀分散在PLA基体中,而达到5%时,则会发生部分团聚。添加ATT后,PLA基体从脆性材料变为韧性材料,ATT起到增韧作用,并显著提高了复合材料的力学性能。当ATT含量为3%时,断裂伸长率达到26.36%,比纯PLA增加了297.6%,并且复合材料的冲击强度也比纯PLA增加了19.7%。ATT/PLA纳米复合材料的复数黏度、储能模量和损耗模量随ATT含量的增加呈先增大后减小趋势。由于ATT与PLA之间有良好的结合力,ATT的加入增大了复合材料的弹性和黏性,且低频区的变化明显高于高频区的变化。
The ATT / PLA nanocomposites with mass fraction of attapulgite (ATT) of 1%, 3% and 5% were prepared by melt blending method. The mechanical properties and rheological properties of ATT / PLA nanocomposites were studied. performance. Infrared spectroscopy results show that there is a strong interaction between ATT and PLA matrix, making the compatibility between the two. When the ATT content is less than 5%, it can be uniformly dispersed in the PLA matrix, and when it reaches 5%, partial agglomeration occurs. After adding ATT, PLA matrix changed from brittle material to toughening material, ATT toughening effect, and significantly improved the mechanical properties of composites. When the content of ATT is 3%, the elongation at break reaches 26.36%, an increase of 297.6% compared with pure PLA, and the impact strength of the composite also increases by 19.7% compared with pure PLA. The complex viscosity, storage modulus and loss modulus of ATT / PLA nanocomposites increased first and then decreased with the increase of ATT content. Due to the good bonding between ATT and PLA, the addition of ATT increased the elasticity and viscosity of the composites, and the changes in the low frequency region were significantly higher than those in the high frequency region.