One‐Pot Synthesis of PTFEMA‐b‐PMMA‐b‐PTFEMA by Controlled Radical Polymerization with a Difunctional Initiator in Conjugation with Photoredox Catalyst of Ir(ppy)3 Under Visible Light. Issue 22 (17th October 2013)

• Record Type: Journal Article
• Authors: Zhang, Xianhong; Zhao, Changwen; Ma, Yuhong; Chen, Haochuan; Yang, Wantai
• Is Part Of: Macromolecular chemistry and physics. Volume 214:Issue 22(2013:Nov.)
• Page Start: 2624
• Page End: 2631
• Publication Date: 2013-10-17
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201300442
• Languages: English
• ISSNs: 1022-1352

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Visible‐light‐induced free radical polymerization of methyl methacrylate (MMA) and 1, 1, 1‐trifluoroethyl methacrylate (TFEMA) with a difunctional initiator, dimethyl 2, 6‐dibromoheptanedioate (DMDBHD), conjugated with a photoredox catalyst, tris(2‐phenylpyridinato)iridium(III) (<italic>fac</italic>‐[Ir(ppy)<sub>3</sub>]), is investigated. Kinetic studies demonstrate that homopolymerizations of both MMA and TFEMA are controlled radical polymerizations. The linear increase of molecular weights with monomer conversion and the narrow PDIs (1.2–1.4) reveal a good living character. In addition, PTFEMA‐<italic>b</italic>‐PMMA‐<italic>b</italic>‐PTFEMA triblock copolymer is prepared by a one‐pot process with sequential monomer addition. The <alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgg3x90rgz9" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math display="inline" altimg="urn:x-wiley:10221352:macp201300442:equation:macp201300442-math-0002" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mover accent="true"><mml:mi>M</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi mathvariant="normal">n</mml:mi></mml:msub></mml:math></alternatives> of the triblock copolymers increases linearly with monomer conversion and the PDI of block copolymers is still maintained around 1.2–1.4. Experimental data confirm that the products are pure block polymers. Furthermore, the molar fraction of the TFEMA monomeric unit in the block copolymer is about 21.96%, close to the theoretical value 21.00% calculated from the monomer conversion. <boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgg3x90rdcw" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>