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首页> 外文期刊>Journal of Polymer Science, Part B. Polymer Physics >Polylactide/Exfoliated Graphite Nanocomposites with Enhanced Thermal Stability, Mechanical Modulus, and Electrical Conductivity
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Polylactide/Exfoliated Graphite Nanocomposites with Enhanced Thermal Stability, Mechanical Modulus, and Electrical Conductivity

机译：具有增强的热稳定性，机械模量和电导率的聚丙交酯/片状石墨纳米复合材料

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摘要

We have prepared a series of polylactide/exfoliated graphite (PLA/EG) nanocomposites by melt-compounding and investigated their morphology, structures, thermal stability, mechanical, and electrical properties. For PLA/EG nanocomposites, EG was prepared by the acid treatment and following rapid thermal expansion of micron-sized crystalline natural graphite (NG), and it was characterized to be composed of disordered graphite nanoplatelets. It was revealed that graphite nanoplatelets of PLA/EG nanocomposites were dispersed homogeneously in the PLA matrix without forming the crystalline aggregates, unlike PLA/NG composites. Thermal degradation temperatures of PLA/EG nanocomposites increased substantially with the increment of EG content up to similar to 3 wt %, whereas those of PLA/NG composites remained constant regardless of the NG content. For instance, thermal degradation temperature of PLA/EG nanocomposite with only 0.5 wt EG was improved by similar to 10 K over PLA homopolymer. Young's moduli of PLA/EG nanocomposites increased noticeably with the increment of EG content up to similar to 3 wt %, compared with PLA/NG composites. The percolation threshold for electrical conduction of PLA/EG nanocomposites was found to be at 3-5 wt % EG, which is far lower graphite content than that (10-15 wt A NG) of PLA/NG composites.
机译：我们通过熔融复合制备了一系列聚丙交酯/片状石墨（PLA / EG）纳米复合材料，并研究了它们的形态，结构，热稳定性，机械和电性能。对于PLA / EG纳米复合材料，通过酸处理并在快速热膨胀微米级结晶天然石墨（NG）之后制备EG，并表征为由无序石墨纳米片组成。结果表明，与PLA / NG复合材料不同，PLA / EG纳米复合材料的石墨纳米片均匀分散在PLA基质中，而没有形成结晶聚集体。 PLA / EG纳米复合材料的热降解温度随​​着EG含量的增加而显着提高，最高达到3 wt％，而PLA / NG复合材料的热降解温度保持恒定，而与NG含量无关。例如，与PLA均聚物相比，只有0.5 wt EG的PLA / EG纳米复合材料的热降解温度提高了约10K。与PLA / NG复合材料相比，PLA / EG纳米复合材料的杨氏模量显着提高，其中EG含量的增加高达3 wt％。发现PLA / EG纳米复合材料的电导渗透阈值为3-5 wt％EG，远低于PLA / NG复合材料的石墨含量（10-15 wt A NG）。

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