Abstract：Polymerization of acrylonitrile (AN) on the presence of small amount of co-monomers such as, itaconic acid (IA), acrylic acid (AA), methacrylic acid (MA), methyl methacrylate (MMA) and acrylamide(AM), were conducted in N,N-dimethylformamide (DMF) solution. The cloudy threshold at which the polymerized mixture becomes heterogeneous was determined for different co-monomer feeds. The cloudy line slope indicates the effect of co-monomer on polyacrylonitrile (PAN) modification. The favorable PAN modification of carbon fiber precursors are ordered as IA > AM > MMA > MA > AA. Then, the co-polymerization kinetics of IA was further studied. With the increase of IA feeding amount, the polymerization rate and polymer molecular weight are both reduced. The reactivity ratio of IA and AN was estimated from experimental data of co-monomer content at different conversion state in a batch reactor by non-linear optimization method. It is found that the co-polymerization of IA-AN in DMF is approximately to be “ideal” with rIA 2.0 and rAN 0.5. The accumulated amount of IA in co-polymer declines linearly with conversion when the IA feeding amount is low as demanded by carbon fiber precursors.
Tan Shuilong,Bu Zhiyang,Li Bogeng. Influence of Small Amount of Co-Monomers on Acrylonitrile Polymerization in Dimethylformamide (DMF) Solution[J]. 化学反应工程与工艺, 2013, 29(1): 81-87.
