Kinetic Analysis on Thermal Decomposition of Poly(lactic acid) Toughened by Calcium Sulfate Whiskers
Kinetic Analysis on Thermal Decomposition of Poly(lactic acid) Toughened by Calcium Sulfate Whiskers
复制标题
DOI：
10.3139/217.3611
复制
发表时间：
2019-03
影响因子：
1.3
通讯作者：
J.-N. Yang;Shi-bin Nie;K. Chen;Yingying Tao;J. Zhu
中科院分区：
文献类型：
--
作者：
J.-N. Yang;Shi-bin Nie;K. Chen;Yingying Tao;J. Zhu
摘要采用熔融共混法制备了硫酸钙晶须（CSW）含量为15%的聚乳酸（PLA）生物复合材料，以增强PLA的增韧和热稳定性。对PLA/CSW复合材料的形态结构、冲击韧性、热稳定性以及热分解动力学进行了深入的研究。结果表明，CSW经硅烷化处理后组织良好，形成良好的界面结合，冲击韧性显著提高。晶须的加入提高了复合材料的热稳定性，导致分解温度升高，质量转化率降低。动力学分析表明，反应级数和活化能存在较大的离散性。虽然与纯PLA相比，PLA/CSW复合材料的反应级数根据除Carrasco的计算方法增加，但复合材料的活化能独立于所应用的数学模型而下降，这意味着引入CSW加速了PLA相的热分解。
Abstract The biocomposites of poly (lactic acid) (PLA) involving 15 % mass fraction of calcium sulfate whiskers (CSW) were prepared via melt-blending technology, in an effort of toughening PLA and enhancing the thermal stability. The morphological structure, impact toughness, thermal stability as well as kinetic analysis on thermal decomposition for PLA/CSW composites were performed thoroughly. The results showed that CSW was organized successfully via silanization, helping to form well-bonded interfaces, and accordingly, the impact toughness increased remarkably. The thermal stability was enhanced by adding whiskers, leading to increased decomposition temperature and decreased mass conversion rate. Kinetic analysis revealed the great dispersions on the reaction order and activation energy. Though, in comparison to pure PLA, the reaction order of PLA/CSW composites increased based on calculation methods except for Carrasco's, the activation energy of the composites declined independently of the applied mathematical models, meaning that thermal decomposition of PLA phase was accelerated by the introduced CSW.