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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。
Using unsaturated polyester resin and natural brucite as raw materials, flame retardant polyester resin / natural brucite composite material was prepared by direct forming technology. The combustion characteristics and thermal decomposition behavior of the composites were analyzed by means of cone calorimeter and TGA. The degradation activation energy of the polyester resin and its natural brucite composites were studied by the Flynn-Wall-Ozawa method. . The results show that the addition of 50% natural brucite can reduce the heat release rate of polyester resin by 75%, and has obvious effect in promoting the decomposition of polyester resin into char and improving the thermo-oxidative stability of polyester resin . The analysis of degradation activation energy shows that the activation energy of polyester material increases with the addition of brucite at the conversion range of 0.1-0.3, indicating that brucite hinders the decomposition of polyester resin during the initial stage of decomposition ; When the conversion ratio is in the range of 0.4-0.6, the activation energy of the polyester material decreases with the addition of brucite, indicating that there is a double decomposition controlled chemical reaction between brucite and the polyester resin in the intermediate decomposition stage, which changes the degradation mode .