Abstract: Chemical crosslinked PVCresin was synthesized by VC/crosslinking monomer copolymerization in suspension process. Effects of crosslinking monomer structure, initial concentration of crosslinking monomer and polymerization temperature on the structure of PVCresin were investigated. It showed that the gel fraction and crosslinking density of geLINcreased as the concentration of diallyl phthalate(DAP) increased and decreased with the increasing of polymerization temperature. Physical entanglements had great contribution to the crosslinking density of gel. The crosslinking density increased rapidly with the increasing of gel fraction when the gel fraction was high. Since diallyl maleate had three double bonds and close reactivity ratio to VC, it had a higher crosslinking efficiency than DAP. Ethylene glycol dimethacrylate(EGDMA) was used up at the early stage of VC/EGDMAcopolymerization due to its higher reactivity compared with VC, so its crosslinking efficiency was much lower than that of DAPand DAM.

Key words: Poly(vinyl chloride), Chemical crosslinking, Diallyl Phthalate, Gel fraction, Crosslinking density