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6608247 
Journal Article 
Synthesis of graft copolymer of polystyrene and polyamide 6 by activated anionic polymerization 
Zhang, Cl; Gu, Xp; Feng, Lf; Hu, Gh 
2008 
42 
12 
2195-8, 2211 
INSPEC:10738244 
In-situ polymerization and in-situ compatibilization is a new way to prepare polymer blends. In order to make clear the compatibilization process, the compatibilizer synthesis should be analyzed firstly to achieve the controllable reaction. In the presence of catalyst sodium caprolactam (NaCL), 3-isopropenyl-alpha,alpha-dimethylbenzyl isocyanate (TMI) bearing the copolymer (PS-co-TMI) of Styrene (St) initiates the activated anionic polymerization of epsilon-caprolactam (CL) to form a graft copolymer of the controllable structure with PS as backbone and PA6 as graft. Results suggested that the polymerization temperature should be higher than 200degC ; an increase in the amount of NaCl leads to a decrease in the induction time of polymerization and an increase in polymerization rate; increasing the TMI content in PS-co-TMI may decrease the induction time of polymerization and the length of PA6 graft; the mass ratio of PS-co-TMI to CL has no effect on the induction time. Therefore, the optimal condition for the synthesis of PS-g-PA6 is that the temperature is above 220degC , the content of catalyst is higher than 3% and at the same time the content of TMI in PS-co-TMI is higher than 2%.