Novel Carbon Nanotube/Poly(L‐lactic acid) Nanocomposites; Their Modulus, Thermal Stability, and Electrical Conductivity
Novel Carbon Nanotube/Poly(L‐lactic acid) Nanocomposites; Their Modulus, Thermal Stability, and Electrical Conductivity
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DOI：
10.1002/masy.200550625
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发表时间：
2005-04
影响因子：
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通讯作者：
Sung‐Il Moon;Fengzhe Jin;Cheol Jin Lee;S. Tsutsumi;S. Hyon
中科院分区：
文献类型：
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作者：
Sung‐Il Moon;Fengzhe Jin;Cheol Jin Lee;S. Tsutsumi;S. Hyon
聚l -乳酸（PLLA）是一种由可再生资源制成且对环境无害的高分子材料，近年来受到越来越多的关注。碳纳米管（CNTs）具有优异的刚度和强度以及优异的热学和电学性能，是开发多功能材料体系的理想候选材料。在这项研究中，研究了CNTs/PLLA纳米复合材料的力学和热性能以及电导率。我们的力学性能研究表明，这些纳米复合材料的抗拉强度和极限伸长率下降，但杨氏模量从1 GPa略微增加到2.5 GPa。将碳纳米管嵌入到聚合物基体中可以提高聚合物的热稳定性。热重分析（TGA）结果表明，PLLA和3wt % CNTs/PLLA纳米复合材料在空气中的初始失重温度与PLLA相同，但纳米复合材料的分解温度比PLLA高约10℃。其他CNTs/PLLA复合材料也发现了类似的结果（5.10 wt%）。此外，还研究了导电性能和电磁波屏蔽效果。
The interest in poly(L-lactic acid)(PLLA) has been increasing in recent years because this polymer is made from renewable resources and its properties are benign to the environment. Carbon nanotubes(CNTs) have shown exceptional stiffness and strength and remarkable thermal and electrical properties, which make them ideal candidates for the development of multifunctional material systems. In this study, mechanical and thermal properties as well as the electrical conductivity of CNTs/PLLA nanocomposites were investigated. Our study of the mechanical properties of these nanocomposites indicates that the tensile strength and ultimate elongation decreased, but Young's modulus slightly increased from 1 GPa to 2.5 GPa. Embedding the CNTs into the polymer matrix improves the thermal stability of the polymer. The thermogravimetric analysis (TGA) results of PLLA and the 3 wt% CNTs/PLLA nanocomposites in air show initial weight loss at the same temperature as PLLA, but the decomposition temperature for the nanocomposite is approximately 10°C higher than that of PLLA. Similar results were found for the other CNTs/PLLA composites (5, 10 wt%). In addition, electrical conductivity and electromagnetic wave shielding effect was also investigated.