丙烯腈-卤代羧酸共聚物热行为的特性  

Peculiarilies of the Thermal Behavior of Copolymers of Acrylonitrile with Halogeuated Carboxylic Acids

作　　者：李培仁[1] 贾卫东[1] 柳伯坚 

机构地区：[1]北京化工学院高分子材料研究所

出　　处：《北京化工学院学报》1993年第4期38-44,共7页

摘　　要：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 stability of AN copolymers was studied by DSC technique in order to get information on the influence of comonomers containing halogenated carboxylic acid on the stabilization of PAN. It is shown that the activation energy of cyclization is reduced in the case of the copolymer with bromoacrylic acid (BrAA, 86.2 kJ/ mol) compared with chloroacrylic acid (ClAA, 158 kJ/mol), acrylic acid (AA, 128 kJ/mol) and itaconic acid(IA, 102kJ/mol). Copolymer AN/BrAA permits the stabilization at higher tempera ture than AN / IA and AN / AA, helping to shorten the stabilization time, It is proved that comonomer ClAA is not superior to BrAA in the effectiveness of thermal stabilization. The mechanism of the cyclization reaction of AN copolymer containing halogenated carboxylic acid is discussed.

关 键 词：丙烯腈 共聚物 卤代羧酸 热稳定性 聚丙烯腈纤维 

分 类 号：TQ342.31[化学工程—化纤工业]