摘要
采用热重(TG)分析法研究了磺基水杨酸掺杂的聚苯胺以及聚苯胺/氧化钕复合材料的热降解过程.热重分析结果表明,纯聚苯胺的失重过程分为两步:第一步为吸附水的脱去,温度范围在3 00~433 K;第二步为聚苯胺分子链的大规模降解,温度范围在447~930 K.当PANI/氧化钕质量比为6∶1时,复合材料的失重过程同样分为两步;而当PANI/氧化钕质量比为2.6∶1时,复合材料的失重过程变为三步.分别使用Friedman和Flynn-Wall-Ozawa两种方法计算出聚苯胺和两种复合材料热降解过程的动力学参数,采用多步线性回归法,并参考常用的15种热降解机理函数,确定了聚苯胺和两种复合材料热降解过程的动力学模型:聚苯胺为D1;PANI/氧化钕(6:1)的复合材料为D3;PANI/氧化钕(2.6∶1)的复合材料为B1.
The thermal decomposition kinetics of the sulfosalicylic acid（ SSA） doped polyaniline（ PANI） and PANI/Nd2O3 composites were investigated by using thermogravimetry（ TG） technique under air atmosphere.The TG curves show that the thermal decomposition process of the SSA doped PANI proceeded in two steps.The first step could be attributed to the expulsion of absorbed water in the temperature range of 300-433 K.The second step is corresponding to the large scale decomposition of the main chain of PANI in the temperature range of 447-930 K. There are also two steps in the process of decomposition of the PANI/Nd2O3（ 6 ∶1）（ w/w） composite. However,the PANI/Nd2O3（ 2. 6 ∶ 1）（ w/w） composite is decomposed in three steps.The activation energies（ Ea） of thermal decomposition processes of the pure PANI and the composites were obtained by two isoconversional methods（ Friedman and Flynn-Wall-Ozawa methods）. According to 15 mechanism functions,the possible kinetic model of these thermal decomposition processes was estimated as D1 for the pure PANI; D3 for the PANI/Nd2O3（ 6 ∶ 1）（ w/w） composite and B1 for the PANI/Nd2O3（ 2. 6 ∶ 1）（ w/w）composite.
出处
《大连交通大学学报》
CAS
2017年第3期59-63,共5页
Journal of Dalian Jiaotong University
基金
辽宁省教育厅高等学校优秀人才支持计划资助项目(LJQ2013051)
