溶液聚合体系中丙烯腈和N-乙烯基咪唑单体竞聚率的测定

Determination of the Monomer Reactivity Ratios of Acrylonitrile and N-Vinylimidazole in Solution Polymerization System

以偶氮二异丁腈(AIBN)为引发剂,N,N-二甲基甲酰胺(DMF)为溶剂,在N2气氛中,70℃时采用自由基溶液聚合法进行了丙烯腈(AN)和N-乙烯基咪唑(VIM)的共聚合反应。采用核磁共振氢谱对不同单体投料比条件下得到的P(AN-co-VIM)的组成进行了测定。分别用F-R法、K-T法计算了2种单体的竞聚率。结果为F-R法r1=0.12,r2=0.61;K-T法r1=0.14,r2=0.67。

Radical-initiated copolymerization of acrylonitrile(AN)and N-vinylimidazole(VIM)was carried out with 2,2'-azobisisobutyronitrile(AIBN)as initiator in N,N-dimethyl-formamide(DMF)at 70℃in nitrogen atmosphere.Composition of P(AN-co-VIM)for a wide range of monomer feed ratios was determined by1 H-NMR.Monomer reactivity ratios of acrylonitrile(AN)and N-vinylimidazole(VIM)were determined by F-R and K-T methods.The results are as follow:F-R method r1=0.12,r2=0.61 and K-T method r1=0.14,r2=0.67。