Atom transfer radical polymerization of styrene and methyl (meth)acrylates initiated with poly(dimethylsiloxane) macroinitiator: Synthesis and characterization of triblock copolymers

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[1] Semsarzadeh, Mohammad Ali
[2] Abdollahi, Mahdi
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Semsarzadeh, M.A. (semsarzadeh@modares.ac.ir) | 1600年 / John Wiley and Sons Inc卷 / 123期
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Poly(dimethylsiloxane)(PDMS)-based triblock copolymers were successfully synthesized via atom transfer radical polymerization (ATRP) initiated with bis(bromoalkyl)-terminated PDMS macroinitiator (Br-PDMS-Br). First; Br-PDMS-Br was prepared by reaction between the bis(hydroxyalkyl)-terminated PDMS and 2-bromo-2-methylpropionyl bromide. PSt-b-PDMS-b-PSt; PMMA-b-PDMS-b-PMMA and PMA-b-PDMS-b-PMA triblock copolymers were then synthesized via ATRP of styrene (St); methyl methacrylate (MMA) and methyl acrylate (MA); respectively; in the presence of Br-PDMS-Br as a macroinitiator and CuCl/PMDETA as a catalyst system at 80 oC. Triblock copolymers were characterized by FTIR; 1H-NMR and GPC techniques. GPC results showed linear dependence of the number-average molecular weight on the conversion as well as the narrow polydispersity indicies (PDI 1HNMR spectra and that calculated theoretically. Results showed that resulting copolymers have two glass transition temperatures; indicating that triblock copolymers have microphase separated morphology. © 2011 Wiley Periodicals; Inc;
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