کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5183895 | 1381032 | 2012 | 12 صفحه PDF | دانلود رایگان |
Design, synthesis, morphology, mechanical properties and in vitro oxidative stability of new class of surface modified thermoplastic elastomers containing mixed soft rubbery poly(n-butyl acrylate-b-dimethylsiloxane-b-n-butyl acrylate) (PnBA-b-PDMS-b-PnBA) block and glassy poly methyl methacrylate (PMMA) end blocks have been reported. Thus well-defined pentablock copolymers such as PMMA-b-PnBA-b-PDMS-b-PnBA-b-PMMA were synthesized by Atom Transfer Radical Polymerization (ATRP). Moderate amount of PDMS (8-15 wt%) in the copolymers significantly enhances the oxidative stability of the surface and contact angle of water in compare to neat PMMA-b-PnBA-b-PMMA copolymer. The phase morphology of such type of copolymers was studied in detailed which suggests that the mixed soft PnBA-b-PDMS-b-PnBA part forms single phase and the degree of phase separation between PnBA-b-PDMS-b-PnBA and PMMA in PMMA-b-PnBA-b-PDMS-b-PnBA-b-PMMA copolymer is higher than the degree of phase separation between PnBA and PMMA in PnBA-b-PDMS-b-PnBA copolymer. This approach of surface modification was extended to synthesize PMMA-b-PLMA-b-PDMS-b-PLMA-b-PMMA (PLMA = polylauryl methacrylate) block copolymers with improved surface properties.
Journal: Polymer - Volume 53, Issue 7, 22 March 2012, Pages 1453-1464