Poly(styrene-alt-maleic anhydride)-block-poly(methacrylate-ran-styrene) block copolymers with tunable mechanical properties by nitroxide mediated controlled radical polymerization

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• 作者：Benoît H. Lessard ; Sarah Mackay ; Adrien Métafiot ; Milan Marić
• 关键词：nitroxide mediated controlled radical polymerization (NMP) ; maleic anhydride (MA) ; methacrylate ; alternating copolymer ; block copolymer
• 刊名：Macromolecular Research
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：24
• 期：8
• 页码：710-715
• 全文大小：415 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Polymer Sciences
  Characterization and Evaluation of Materials
  Soft and Granular Matter, Complex Fluids and Microfluidics
  Nanochemistry
  Nanotec
  
• 出版者：The Polymer Society of Korea, co-published with Springer
• ISSN：2092-7673
• 卷排序：24

文摘

Poly(styrene-alt-maleic anhydride)-block-poly(methacrylate-ran-styrene) block copolymers were synthesized from low dispersity (M_w/M_n=1.24) and perfectly alternating poly(styrene-alt-maleic anhydride) macroinitiators, by nitroxide mediated controlled radical polymerization (NMP), using various methacrylate-rich mixtures: methyl methacrylate/styrene (MMA/S), ethyl methacrylate/styrene (EMMA/S), n-butyl methacrylate/styrene (BMA/S) and benzyl methacrylate/styrene (BzMA/S). Some irreversible termination was present during the chain extension from the macroinitiator, resulting in some bimodality in the molecular weight distribution of the final block copolymer (≈2% to ≈25% dead chains) which is common for methacrylate/styrene copolymerizations by NMP. The resulting final block copolymers were determined to be methacrylate-rich (molar ratio XMA/S ≈3.3 to 5.5) by 1H NMR and the resulting glass transition temperature (T_g) of the chain-extended segments were found to be similar to the coresponding pure poly(methacrylate)s. NMP allows the controlled placement of functional maleic anhydride containing segments within a block copolymer with tunable mechanical properties by simple substitution of methacrylate monomer used in synthesis.