The production and properties of polylactide composites filled with expanded graphite
The production and properties of polylactide composites filled with expanded graphite
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DOI：
10.1016/j.polymdegradstab.2009.12.019
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发表时间：
2010-05-01
影响因子：
5.9
通讯作者：
Dubois, Philippe
中科院分区：
文献类型：
--
作者：
Murariu, Marius;Dechief, Anne Laure;Dubois, Philippe
将可生物降解的聚乳酸(PIA)与商用膨胀石墨(EG)熔融共混，制得复合材料。采用不同的加成方法，考察了EG对聚乳酸分子性能、热机械性能和阻燃性能的多方面影响。EG纳米填料为PIA复合材料提供了具有竞争力的功能特性。它们具有较高的刚性，杨氏模量和储能模量随EG含量的增加而增大。它们还具有优异的热稳定性，同时保持了原始PIA基质的玻璃化转变和熔融温度。实验证明，EG纳米填料的提纯和预分散有利于保持聚乳酸的相对分子质量，并改善了力学性能。聚乳酸中分散的石墨烯纳米层的存在显著地加速了聚酯的结晶过程。阻燃性能也有所改善，锥形量热仪记录的最大放热速率大幅下降，而水平燃烧试验(UL94HB)成功通过，表明不会滴落和结焦。(C)2010爱思唯尔有限公司。保留所有权利。
Composites have been produced by melt-blending biodegradable polylactide (PIA) with commercially available expanded graphite (EG). Using different techniques of addition, the manifold effects of EG on PLA molecular, thermo-mechanical and fire-retardant properties were evaluated. The EG nanofiller provides PIA composites with competitive functional properties. They have a high rigidity, with Young's modulus and storage modulus increasing with EG content. They also have excellent thermal stability while preserving the glass transition and melting temperature of the original PIA matrix. Purification and pre-dispersion of EG nanofiller proved beneficial for preserving PLA molecular weights and led to improved mechanical performance. The presence of dispersed graphene nanolayers in PLA significantly accelerated the polyester crystallization process. The flame retardant properties also displayed improvements with a large decrease in the maximum rate of heat release as recorded by cone calorimetry, whereas the horizontal burning test (UL94 HB) was successfully passed revealing non-dripping and char formation. (C) 2010 Elsevier Ltd. All rights reserved.