ABSTRACT:A new acyl-group transfer polymerization of thiiranes using carboxylic acid derivatives and quaternary onium salts was investigated. 3-Phenoxypropylene sulfide (PPS) was polymerized efficiently by S-phenyl thioacetate in the presence of tetrabutylammonium chloride, bromide, or tetrabutylphosphonium chloride to give the corresponding polysulfide with a S-acetyl group at the polymer terminal. The polymerization of 3-butoxypropylene sulfide (BPS) and cyclohexene sulfide (CHS) also proceeded under the similar conditions to afford the corresponding polymers. It was found from the polymer structures and results of post-polymerization that the polymerization proceeded transferring an acyl group in each propagating step. It was demonstrated that the acyl-group transfer polymerization has living nature. Furthermore, di-and tri-block copolymers of a variety of thiiranes were successfully synthesized by the present acyl-group transfer polymerization.
KEY WORDSAcy! Group/ Group Transfer Polymerization / Thiiranes / Carboxylic Acid Derivatives / Quaternary Onium Salts / Block Copolymer / Group transfer polymerization is a new living polymerization for acrylic and methacrylic monomers, which was reported in the first by Webster and his co-workers. 1
SynopsisThe photosensitivities and the rates of photocrosslinking of poly(viny1 a-cyanocinnamate) and poly(viny1 a-cyanocinnamoxyacetate) were investigated. The photocrosslinkings of these polymers proceeded mainly through radical addition, and these polymers showed higher photosensitivities than poly(viny1 cinnamate) and poly(viny1 cinnamoxyacetate), in spite of lower rates of photocrosslinking of the former polymers.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.