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用DSC技术研究了丙烯腈共聚物的热行为以查明含卤代羧酸共聚单体对PAN热稳定化过程的影响。实验结果表明:含有溴代羧酸(BrAA),氯代羧酸(ClAA),丙烯酸(AA)及衣康酸(IA)四种共聚物的环化活化能相应为86.2,158,128,102kJ/mol,其中以PAN/BrAA的环化活化能最低,并且与PAN/IA及PAN/AA相比,可以在较高温度下进行热稳定化反应,有助于缩短热稳定化时间。实验还表明,在热稳定化效率方面共聚单体BrAA优于ClAA。对于卤代羧酸共聚物的环化反应机理也进行了讨论。
The thermal behavior of acrylonitrile copolymer was investigated by DSC to find out the influence of halogenated carboxylic acid comonomer on PAN thermal stabilization process. The experimental results show that the cyclization activation energy of four copolymers containing bromocarboxylic acid (BrAA), chlorinated carboxylic acid (ClAA), acrylic acid (AA) and itaconic acid (IA) are 86.2,158,128,102kJ / mol, Among them, PAN / BrAA has the lowest cyclization activation energy and can be thermally stabilized at higher temperatures compared with PAN / IA and PAN / AA, which helps to shorten the thermal stabilization time. Experiments also show that the comonomer BrAA is superior to ClAA in terms of thermal stabilization efficiency. The cyclization mechanism of the halocarboxylic acid copolymer is also discussed.