Controlled synthesis of sulfonated block copolymers having thermoresponsive property by RAFT polymerization of vinyl sulfonate esters was written by Mori, Hideharu;Saito, Yosuke;Takahashi, Eri;Nakabayashi, Kazuhiro;Onuma, Atsuhiko;Morishima, Makoto. And the article was included in Polymer in 2012.COA of Formula: C14H12S2 This article mentions the following:
Four vinyl sulfonate ester derivatives, Me ethenesulfonate (MES), Et ethenesulfonate (EES), 2,2,2-trifluoroethyl ethenesulfonate (TFES), and 2,2,2-trichloroethyl ethenesulfonate (TCLES), which are protected forms of vinyl sulfonic acids, were polymerized by reversible addition-fragmentation chain transfer (RAFT) polymerization Polymers having relatively narrow mol. weight distributions and pre-determined mol. weights were obtained by the polymerization of all monomers using a suitable xanthate-type chain transfer agent (CTA). The RAFT polymerizations of EES and TCLES were found to proceed in controlled fashions under suitable conditions, as confirmed by the formation of narrow polydispersity products, mol. weights controlled by the monomer/chain transfer agent ratio, and linear increases in mol. weight with conversion. Deprotection of the Et group of poly(EES) by LiBr in refluxing 2-butanone proceeded smoothly to give water-soluble poly(lithium vinyl sulfonate). Poly(potassium vinyl sulfonate) was also obtained by the deprotection of poly(TCLES) using potassium tert-butoxide. The syntheses of thermoresponsive block copolymers involving poly(lithium vinyl sulfonate) segments were conducted by RAFT polymerization of N-isopropylacrylamide using poly(EES) macro-CTA, followed by deprotection. THe thermally-induced phase separation behavior and assembled structures of the block copolymers were also studied in aqueous solution In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7COA of Formula: C14H12S2).
Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is 绾?valerolactone.COA of Formula: C14H12S2
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics