煤沥青粉填充氯醋/聚氨酯复合材料的热特性  

Thermal Characteristics of Coal-Tar Pitch Filled P(VC-VAc)/PU Composites

作　　者：李万捷[1] 张腊[1] 王志忠[1] 和涛[2] 郭健[2] 

机构地区：[1]太原理工大学化学化工学院 [2]太原市塑料研究所,山西太原030024

出　　处：《高分子材料科学与工程》2008年第6期136-139,共4页Polymer Materials Science & Engineering

摘　　要：采用差示扫描量热分析(DSC)、热重分析(TG)研究了煤沥青粉填充氯醋/聚氨酯复合材料的玻璃化转变温度、粘流温度及热分解特性,在氮气氛下以不同升温速率讨论并计算得热解动力学相关参数及热解速率经验方程式。结果表明,煤沥青粉填充氯醋/聚氨酯弹性体复合材料的玻璃化温度为-46℃,粘流温度为145℃,其耐热特性与氯醋/聚氨酯材料基本一致。该复合材料热降解分两阶段,活化能E为(97.9±1.1)kJ/mol(、229.8±3.9)kJ/mol,反应级数n为1.2和0.9。Coal-tar pitch filled poly （ vinyl chloride-vinyl acetate） P（VC-VAc）/polyurethane （PU） composites were prepared by solution blending. The glass transition temperature （Tg） and the temperature of flowing （Tf） of coal-tar pitch filled P（VC-VAc）/PU composites were determined with differential scanning calorimetry （DSC） at 10 ℃/min heating rate. DSC shows the Tg is - 46 ℃, the Tf is 145 ℃. The thermal decomposition process taking place of coal-tar pitch filled P（VC-VAc）/PU composites was studied using thermogravimetry （TG） in the temperature range from 100 ℃ to 650 ℃ under nitrogen at several heating rates. The kinetic parameters, including the energy of activation （E） and the reaction order （n） of degradation reaction for composites were gained by using Friedman method. The results show that the thermal degradation of coal-tar pitch filled P （VC-VAc）/PU composites in nitrogen is divided into two stages. The dynamic data such as the apparent activation energies （97.9 ± 1.1） kJ/mol and （229.8 ± 3） kJ/mol respectively, the reaction orders of reaction n = 1.2 and n = 0.9 respectively. The results provide a theoretical foundation for coal-tar pitch as filler, the evaluation of the thermal stability of the composites and their applications.

关 键 词：煤沥青粉 填料 氯醋/聚氨酯 热特性 

分 类 号：TQ314.261[化学工程—高聚物工业]