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Synthesis and characterization of poly(HEMA‐ co ‐MMA)‐ g ‐POSS nanocomposites by combination of reversible addition fragmentation chain transfer polymerization and click chemistry
Author(s) -
Islam Md. Rafiqul,
Bach Long Giang,
Park Jong Myung,
Hong SeongSoo,
Lim Kwon Taek
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.37520
Subject(s) - polymer chemistry , materials science , chain transfer , polymerization , nanocomposite , click chemistry , methacrylate , methyl methacrylate , copolymer , raft , reversible addition−fragmentation chain transfer polymerization , fourier transform infrared spectroscopy , radical polymerization , polymer , chemical engineering , composite material , engineering
New hybrid poly(hydroxyethyl methacrylate‐ co ‐methyl methacrylate)‐ g ‐polyhedral oligosilsesquioxane [poly(HEMA‐ co ‐MMA)‐ g ‐POSS] nanocomposites were synthesized by the combination of reversible addition fragmentation chain transfer (RAFT) polymerization and click chemistry using a grafting to protocol. Initially, the random copolymer poly(HEMA‐ co ‐MMA) was prepared by RAFT polymerization of HEMA and MMA. Alkynyl side groups were introduced onto the polymeric backbones by esterification reaction between 4‐pentynoic acid and the hydroxyl groups on poly(HEMA‐ co ‐MMA). Azide‐substituted POSS (POSSN 3 ) was prepared by the reaction of chloropropyl‐heptaisobutyl‐substituted POSS with NaN 3 . The click reaction of poly(HEMA‐ co ‐MMA)‐alkyne and POSSN 3 using CuBr/PMDEATA as a catalyst afforded poly(HEMA‐ co ‐MMA)‐ g ‐POSS. The structure of the organic/inorganic hybrid material was investigated by Fourier transformed infrared, 1 H‐NMR, and 29 Si‐NMR. The elemental mapping analysis of the hybrid using X‐ray photoelectron spectroscopy and EDX also suggest the formation of poly(HEMA‐ co ‐MMA)‐anchored POSS nanocomposites. The XRD spectrum of the nanocomposites gives evidence that the incorporation of POSS moiety leads to a hybrid physical structure. The morphological feature of the hybrid nanocomposites as captured by field emission scanning electron microscopy and transmission electron microscopic analyses indicate that a thick layer of polymer brushes was immobilized on the POSS cubic nanostructures. The gel permeation chromatography analysis of poly(HEMA‐ co ‐MMA) and poly(HEMA‐ co ‐MMA)‐ g ‐POSS further suggests the preparation of nanocomposites by the combination of RAFT and click chemistry. The thermogravimetric analysis revealed that the thermal property of the poly(HEMA‐ co ‐MMA) copolymer was significantly improved by the inclusion of POSS in the copolymer matrix. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013