Polymethylstyrene preparation

The work reported in this paper concerns the synthesis of a series of chlorinated polymethylstyrenes, prepared by chlorination of both anionically and free radically synthesized polymethylstyrene, and their subsequent characterization by H NMR, 13C NMR, IR and elemental analysis. The preliminary lithographic evaluation of the chlorinated materials is also discussed. 

Polymethylstyrene (PMS) and PCMS (both prepared from mixtures of meta and para isomers) were prepared by free radical polymerization of the respective monomers in toluene initiated by benzoyl peroxide at 85°C (12). Chlorination of P-p-MS was carried out in carbon tetrachloride (CC14) at 60 °C in presence of AIBN using the desired amount of S02C12 (13). Chlorination of PMS was carried out in CC14 at 50 °C under irradiation from a 60W incandescent light with the requisite amount of t-BuOCl (14). 

The choice of suitable initiating system allows preparation of polystyrene containing ARs on one (n-bntyl lithium) or two (naphthalate sodium) ends of macromolecules. By this method, aminoxyl-containing polymethylstyrene, poly-2-vinylpiridine and a copolymer of styrene with methylstyrene have been obtained [61]. 

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