利用TG-FTIR联用对高等规度聚丙烯腈热降解过程的研究  

Study on poly(acrylonitrile) with high isotacticity during thermal degradation using TG-FTIR analysis

作　　者：张力[1,2] 刘志玲 易凯[1] 代永强[1] 金日光[1] 

机构地区：[1]北京化工大学化工资源有效利用重点实验室,北京100029 [2]西北化工研究院,西安710600 [3]陕西延长石油(集团)有限责任公司研究院,西安710075

出　　处：《化工新型材料》2012年第9期104-106,共3页New Chemical Materials

摘　　要：利用三乙基铝作为阴离子聚合引发剂,成功制备了高等规度聚丙烯腈聚合物,13 C-NMR测得其全通比例含量高达53.5%;通过热重-红外光谱(TGA-FTIR)联用详细分析了聚合物热降解过程中气体释放情况。研究表明:聚合物在整个热解过程主要有CO2、NH3、HCN和H2O裂解气体产生,热解过程可以大致分为五个阶段,其中282℃之前聚合物基本没有发生失重现象,282～292℃纤维发生预氧化反应,大量的NH3、CO2及H2O释放造成重量损失明显,292～487℃经过预氧化后,聚合物耐热性有所提失重率减少,487～700℃温区内CO2为主要的裂解产物,使得聚合物全部裂解。High isotacticity polyacrylonitrile（PAN） with triad isotacticity of 53. 5% ,which was determined by 13C NMR using dialkylrnagnesium（R2 Mg） as an initiator, was successfully synthesized. The released gases during thermal degradation were carefully studied by using thermal gravimetric analysis coupled with FTIR. The results indicated that there were five stages during the degradation with products of CO2, NH3, HCN and H2 O. There was almost none weight loss before 282℃ ; cyclization reaction happened in the temperature range of 282 to 292℃. NH3 ,CO2 and H2O were main products which caused weight loss; cyclized structure formed previously promoted thermal resistance and the rate of weight loss decreased in the temperature range of 292 to 487℃. CO2 was the main released gas for the pyrolysis of polymer under such high temperature of 487 to 700℃.

关 键 词：TG-FTIR 高等规度 聚丙烯腈 热解 

分 类 号：O632.62[理学—高分子化学]