Abstract: Styrene(S) and divinyl benzene(DVB) were used as starting materials, and poly(lactic acid)(PLA) with terminated S-(thiobenzoyl)thioglycolic ester was used as the chain transfer agent. A styrenic monomer containing boron-dipyrromethene fluorophore(BODIPY)(BDP-St) was also copolymerized to form the cross-linked polymers using reversible addition-fragmentation chain transfer(RAFT) polymerization. Heterogeneous polymeric photocatalysts were obtained by selectively etching the PLA segments in the cross-linked polymers using the methanol/water solution of NaOH. Photocatalytic oxidation of thioanisole was studied using the cross-linked polymers. The results show that the polymeric materials obtained have no pore structures. Photocatalytic experiments show that the catalytic properties of polymers obtained from the chain transfer agent containing a PLA segment are better than those from a small molecular chain transfer agent, but the content of PLA has little effect on the catalytic properties.

Key words: cross-linked polymer, reversible addition-fragmentation chain transfer polymerization, microphase separation, heterogeneous photocatalysts