聚乳酸/纳米石墨薄片复合材料的热分解动力学

采用溶液浇铸法制得聚乳酸/纳米石墨薄片复合材料.以TG/DTG为手段,研究了该纳米复合材料在氮气气氛中的热分解变化,利用Flynn-Wall-Ozawa(FWO)方程和Friedman方程对其进行了动力学分析.结果表明,纳米石墨薄片对聚乳酸热分解的初期过程影响比较明显,当失重百分率为2%时,聚乳酸热分解温度最高提高16.3℃;当添加纳米石墨薄片含量为5%时,纳米石墨薄片能提高聚乳酸的热分解活化能,两种方程处理的结果具有一致性,对活化能的影响也主要体现在热分解的初始阶段.

Thermal Decomposition Kinetics of Polylactide/Nano-Graphite Sheets Composites

The polylactide/nano-graphite sheets composites were prepared by the solvent casting method. Its thermal decomposition in N_2 atmosphere was studied using TG/DTG techniques. The thermal decomposition kinetic study was calculated through the Flynn-Wall-Ozawa(FWO) equation and the Friedman equation. The results showed that the early thermal decomposition of the polylactide/nano-graphite sheets composites effected by the nano-graphite sheets were obvious. The most thermal decomposition temperature was improved 16.3 ℃ at the 2% weight loss percentage of the polylactide/nano-graphite sheets composites. The thermal decomposition activation energies of the polylactide/nano-graphite sheets composites were improved with 5% nano-graphite sheets added in the polylactide. The results were consistent calculated by the two equations. The impact on the polylactide thermal decomposition processing activation energies was reflected in the initial stage too.