Cationic polymerization in liquid sulfur dioxide. II. Cationic polymerization of styrene with the friedel-crafts-type and other acid catalysts

摘要: Cationic polymerization of styrene in liquid sulfur dioxide was carried out at 0° using Friedel-Crafts-type metal chlorides, and inorganic organic acids as catalysts. All catalysts the possessed excellent abilities to affect cationic polymerization, gave polystyrenes high molecular weight quantitative yield. Catalytic activity decreased order: FeCl3, BF3(C2H5)2O, SnCl4, AlCl3, ZnCl2, SbCl5, TiCl4. The polystyrene formed by use a catalyst TiCl4, SbCl5. with from among this type catalyst, seemed be “living polymer” type, similar case SnCl4 reported preceding paper. Of acid reagents employed, H2SO4, HSO3Cl, C6H5SO3H, P2O5, HClO4 showed ability polymerization. Polystyrene quantitatively, although polymers not so large.