阻燃聚酯树脂/天然水镁石复合材料热分解动力学

作者：李鑫 于洪浩

单位：沈阳理工大学材料科学与工程学院 沈阳 110159

关键词：聚酯树脂 阻燃 天然水镁石 复合材料 动力学

分类号：TQ323

出版年,卷(期):页码：2016,44(7):1046-1050

DOI：10.14062/j.issn.0454-5648.2016.07.21

摘要：

以不饱和聚酯树脂和天然水镁石为原料，采用直接成型技术制备了阻燃聚酯树脂/天然水镁石复合材料。利用锥形量热仪和热重分析仪分析了复合材料的燃烧特性和热分解行为，通过Flynn–Wall–Ozawa动力学方法研究了聚酯树脂及其和天然水镁石复合材料的降解活化能。结果表明：添加质量分数为50%的天然水镁石，可使聚酯树脂的热释放速率降低75%，在促进聚酯树脂分解成炭和改善聚酯树脂热氧稳定性方面具有明显的作用。降解活化能分析表明：转化率在0.1~0.3范围时，聚酯材料的活化能随着水镁石的加入而提高，说明在分解起始阶段水镁石对聚酯树脂分解过程起到阻碍作用；转化率在0.4~0.6范围时，聚酯材料的活化能随着水镁石的加入而下降，说明在分解中间阶段，水镁石和聚酯树脂存在双重分解控制的化学反应，改变了降解模式。

Flame–retarded unsaturated polyester resins filled with brucite powders were prepared by direct molding technique. The flammability properties and the thermal oxidative degradation behaviour were studied by cone calorimetric test (CCT) and thermogravimetric analysis (TGA). The Flynn–Wall–Ozawa model–free kinetic method was applied to determine the apparent activation energy (E) for the degradation of pristine polyester and flame–retardant polyester composites. The CCT indicated that the heat release rate (HRR) values decreased 75% when the brucite loading of about 50% of the whole mass. The results of TGA showed that the addition of brucite increased char formation and improved the thermal oxidative stability of polyester resins in air. An incorporation of the brucite powder resulted in a noticeable increase in the activation energy of the obtained composites in the conversion (α) range of 0.1–0.3, which suggested the brucite powder played a hindering role in decomposition of polyester network. A drop in the activation energy of the obtained composites in the conversion (α) range of 0.4–0.6, which suggested the kinetically dominating process was chemical decomposition reaction.

基金项目：

国家自然基金项目(U1360204，50234040)；辽宁省教育厅项 目(L2013089)；沈阳理工大学重点实验室开放基金项目。

作者简介：

李鑫(1980—)，女，博士，讲师。

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