Abstract
The introduction of acylium perchlorate groups onto ultrafine silica was achieved by the reaction of silver perchlorate with acyl chloride groups, which were introduced by the treatment of carboxyl groups with thionyl chloride. The introduction of carboxyl groups onto silica surface was achieved by the hydrolysis of acid anhydride groups which introduced by the treatment of silica with 4-trimethoxysilyl tetrahydrophthalic anhydride. Surface acylium perchlorate groups introudced onto silica were capable of initiating cationic polymerization of styrene and polystyrene was effectively grafted onto the surface. The percentage of grafting increased to 65.4%. The grafting efficiency was high during the first few conversion but rapidly decreased with an increase in conversion. This suggests that the grafted polymer propagates from acylium perchlorate groups and that ungrafted polymer is gradually formed by a chain transfer of growing polymer cation to the monomer. The cationic ring-opening polymerizations of tetrahydrofuran, styrene oxide, β-propiolactone, and ε-caprolactone were also initiated by acylium perchlorate groups on silica surface to give the corresponding polymer-grafted silica. The polymer-grafted silica gave a stable colloidal dispersion in good solvents for grafted polymer.
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Tsubokawa, N., Kogure, A. Cationic Graft Polymerization from Ultrafine Silica Initiated by Acylium Perchlorate Groups Introduced onto the Surface. Polym J 25, 83–89 (1993). https://doi.org/10.1295/polymj.25.83
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DOI: https://doi.org/10.1295/polymj.25.83
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