Title: Study on Bulk Polymerization of Styrene with Dithioester as Chain Transfer Agent
Abstract: The bulk polymerizations of styrene were studied in detail by using AIBN as initiator and using benzyl dithiobenzoate (BDB), 1-phenylethyl dithiobenzoate (PEDB) and cumyl dithiobenzoate (CDB) as chain transfer agents, respectively. The experiments show that when the concentrations of AIBN and RAFT agent are increased, the polymerization rate increases for both BDB/AIBN/St and PEDB/AIBN/St systems, but decreases for the CDB/AIBW/St system. And the experimental results indicate that for BDB/AIBN/St and PEDB/AIBN/St system the effect of initiator on polymerization plays a primary role, but for CDB/AIBN/St system the effect of RAFT agent on polymerization is dominant. In CDB system, the molecular weight distribution of polymer becomes broader along with raising the monomer conversion. But in BDB system molecular weight distribution gets narrower with raising the monomer conversion under the high BDB concentration, while, if the BDB concentration is low, the polymerization can not be controlled effectively and the molecular weight contribution becomes broader in the final stage. The results of kinetic study and GPC analysis both show that the bulk polymerization of styrene can be controlled effectively when BDB is used as chain transfer agent. By considering the combined effects of RAFT agents and initiator, a revised model for predicting molecular weight was proposed, which can be used to predict the polymer molecular weight of bulk polymerization of styrene with dithioester as chain transfer agents.
Publication Year: 2005
Publication Date: 2005-01-01
Language: en
Type: article
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