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首页> 外文期刊>Journal of Applied Polymer Science >Investigation on the environmental-friendly poly(lactic acid) composites based on precipitated barium sulfate: Mechanical, thermal properties, and kinetic study of thermal degradation
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Investigation on the environmental-friendly poly(lactic acid) composites based on precipitated barium sulfate: Mechanical, thermal properties, and kinetic study of thermal degradation

机译：基于沉淀硫酸钡的环保聚（乳酸）复合材料的研究：热降解的机械，热性能和动力学研究

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摘要

A novel environmental-friendly poly(lactic acid) (PLA) composites based on precipitated barium sulfate (BaSO4) were prepared via melt-compounding. The mechanical properties and thermal stability of PLA/BaSO4 composites were investigated. To dig the decomposition mechanism, kinetic analysis of thermal degradation was emphasized systematically based on nonisothermal thermograms. Results showed that the mechanical responses were improved remarkably both under the quasi-static condition and subjected to high-speed shock due to the well-bonded interfaces between PLA and BaSO4. Meanwhile, the added BaSO4 suppressed the mass conversion rate of PLA phase and improved the thermal stability at high temperature. Due to the inhibition of BaSO4, the calculated activation energy was enhanced obviously according to model-free isoconversional approaches. Finally, the apparent kinetic mechanism and reaction order for the over-all thermal degradation were determined by the combination of model-fitting approaches and Carrasco method. From this study, we hope to provide a facile method to prepare environmental-friendly PLA composites with excellent mechanical properties and thermal stability. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47995.
机译：基于熔融配合制备基于沉淀的硫酸钡（BasO4）的新型环保聚（乳酸）（PLA）复合材料。研究了PLA / BasO4复合材料的机械性能和热稳定性。为了挖掘分解机理，系统地基于非等温热图系统地强调热劣化的动力学分析。结果表明，由于PLA和BASO4之间的良好粘合的界面，机械响应在准静态状态下显着提高，并且对高速冲击进行高速冲击。同时，添加的BasO4抑制了PLA相的质量转化率，并在高温下提高了热稳定性。由于BasO4的抑制，根据无模型的异组方法的方法显然提高了计算的活化能量。最后，通过模型配件方法和卡拉斯科方法的组合来确定表观动力学机制和用于过热的反应顺序。从这项研究开始，我们希望提供一种适用的方法来制备具有优异的机械性能和热稳定性的环境友好型PLA复合材料。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47995。

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