Controlled synthesis of copolymers of styrene and methyl methacrylate in the presence of reversible chain transfer agents was written by Chernikova, E. V.;Tarasenko, A. V.;Yulusov, V. V.;Garina, E. S.;Golubev, V. B.. And the article was included in Vysokomolekulyarnye Soedineniya, Seriya A i Seriya B in 2009.Category: esters-buliding-blocks This article mentions the following:
Mol. weight characteristics of styrene-Me methacrylate copolymer obtained via reversible chain transfer mechanism in the presence of dithiobenzoate agents were studied. In order to obtain copolymers with narrow mol. weight distributions, low mol. weight chain transfer agents (CTA) were be used. CTA were active in homopolymerization of both monomers. Conditions for the preparation of block copolymers with narrow mol. weight distribution with and a given structure and mol. weight of the blocks were determined Polymeric reversible CTA was responsible for the composition and mol. weight of the 1st block, while the structure of the second block depended on the compositions of the monomer mixture Mol. weight characteristics depended on the concentration of CTA and monomer conversion. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Category: esters-buliding-blocks).
Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Category: esters-buliding-blocks
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics