不同共聚体系对丙烯腈与丙烯酸单体竞聚率的影响  

EFFECT OF COPOLYMERIZATION SYSTEMS ON MONOMER APPARENT REACTIVITY RATIOS OF ACRYLONITRILE/ACRYLIC ACID

作　　者：陈厚[1] 刘军深[1] 曲荣君[1] 纪春暖[1] 王成国[2] 蔡华[2] 

机构地区：[1]烟台师范学院化学与材料科学学院,山东烟台264025 [2]山东大学材料科学与工程学院,山东济南250061

出　　处：《高分子材料科学与工程》2005年第6期66-68,共3页Polymer Materials Science & Engineering

基　　金：国家高技术研究和发展项目(863-2002AA304130);烟台师范学院自然科学基金项目(042920)

摘　　要：采用K e len-T udos方法,测定了丙烯腈(AN)与丙烯酸(AA)共聚合反应体系中单体竞聚率,探讨了不同反应体系对单体竞聚率的影响。结果表明,在水相悬浮聚合体系中,当转化率小于20%时,两单体的竞聚率同DM SO均相溶液聚合结果相近;随转化率的增加,AN竞聚率增加,AA竞聚率减小,当转化率超过50%后,两单体竞聚率变化不明显。在H2O/DM SO混合溶剂沉淀聚合中,当水含量超过80%后,两单体竞聚率向水相悬浮聚合结果靠近。随溶剂极性增大,rAN与rAA值均减小。Effects of copolymerization systems on monomer apparent reactivity ratios for copolymers of acrylonitrile with acrylic acid were studied for contrast. Values of monomer apparent reactivity ratios were calculated by Kelen-Tudos method. It is found that the apparent reactivity ratios in aqueous suspension polymerization system are similar to those in solution polymerization system at polymerization conversion less than 20%. As conversion of beyond 50%, the changes of monomer apparent reactivity ratios become less prominent. In water-rich reaction medium （H2O/DMSO〉80/20）, monomer apparent reactivity ratios are approximately equivalent to those in aqueous suspension polymerization system. In DMSO-rich reaction medium （DMSO/ H2O〉80/20）, apparent reactivity ratios are similar to those in solution polymerization system. With an increase of polarity of solvent, values of apparent reaction ratios both decrease.

关 键 词：共聚反应 动力学 竞聚率 

分 类 号：TQ316.342[化学工程—高聚物工业]