RAFT Polymerization of Vinylthiophene Derivatives and Synthesis of Block Copolymers Having Cross-Linkable Segments was written by Mori, Hideharu;Takano, Ken;Endo, Takeshi. And the article was included in Macromolecules (Washington, DC, United States) in 2009.Formula: C14H12S2 This article mentions the following:
The polymerization of three vinylthiophene derivatives, 2-vinylthiophene (2VT), 3-vinylthiophene (3VT), and 2,5-dibromo-3-vinylthiophene (DB3VT), was carried out by reversible addition-fragmentation chain transfer (RAFT) process using six different chain transfer agents (CTAs). The novel doubly polymerizable monomer, DB3VT, undergoes controlled radical polymerization via the RAFT process, followed by Suzuki coupling reaction. Two dithiobenzoate-type RAFT agents, phenylethyl dithiobenzoate (CTA 2) and cumyl dithiobenzoate (CTA 3), were the most efficient to obtain poly(DB3VT) with controlled mol. weights and low polydispersities (Mw/Mn = 1.05-1.15). Good control of the polymerization of DB3VT was confirmed by the linear increase in the mol. weight with the conversion and the ability to extend the chain by a second addition of the monomer. Chain extension from poly(Me methacrylate) to DB3VT could be well controlled under suitable conditions and provided block copolymers having cross-linkable poly(DB3VT) segments with as-designed chain structures and low polydispersities. The block copolymers were also synthesized by RAFT polymerization of DB3VT using poly(Me acrylate) as a macro-chain transfer agent (macro-CTA). Modifications of the 2,5-dibromide group of poly(DB3VT) by Suzuki coupling reaction using difunctional boronic acid afforded a network material, whereas a soluble composite having an extended π-structure was obtained by the coupling reaction of the block copolymer, poly(Me methacrylate)-b-poly(DB3VT). In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Formula: C14H12S2).
Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. 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.Formula: C14H12S2
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics