摘要
采用TG—DSC—FTIR技术研究酚醛树脂的热解过程,并用FTIR对不同温度下的受热产物进行分析。结果表明,酚醛树脂的热解可划分为3阶段:第一阶段,由于树脂中固化后残存的水分蒸发及树脂进一步缩合,质量损失率12.64%。第二阶段,质量损失速率在537.2℃时达到最大值0.151mg/min,共失重19.57%,这是酚醛树脂热分解的主要阶段,释放出H2O、低分子酚类物质(LMP)、CO2、CH4等低分子烃(LMH)和CO等热解产物。第三阶段为热解的收尾阶段,失重8.31%,释放出CH4等LMH和CO。酚醛树脂在氮气保护下的整个热解过程均需吸收热量。FTIR分析表明,酚醛树脂受热后,游离OH含量持续下降,直至完全炭化。在400℃以上,由于热解释放出LMP和CH4等LMH,产物中C—H和酚环C—O吸收峰明显降低。
An experiment was conducted to study the pyrolysis of PF resin with TG-DSC-FTIR, and the products of PF resin heated under different temperatures were analyzed with FTIR. Result shows that PF resin pyrolyzing could be divided into three stages. At the first stage, the mass loss rate of water evaporation and PF resin condensation was 12.64%. At the second stage, the maximum mass loss rate occurring at 537.2 degrees C was 0.151 mg/min. This was the main stage of PF resin pyrolyzing and its total mass loss was 19.57%. H2O, low molecular weight phenolic substances （LMP） , CO2, low molecular weight hydrocarbon （LMH, including CH4 ） , and CO were produced at this stage. The third stage was the ending stage with a mass loss rate of 8.31%, and CO, CH4 and other LMH were released. The whole pyrolysis of PF resin under nitrogen flow was endothermic, and the free hydroxyl groups kept decreasing till the resin was carbonized completely. The C-H and phenolic C-O absorption peaks obviously declined when the temperature was more than 400 degrees C due to the release of LMP, CH4 and other LMH.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2007年第6期56-58,共3页
Journal of Northeast Forestry University
基金
霍英东教育基金项目(编号:91027)
国家自然科学基金项目(编号:30500385)的部分内容
