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Synthesis and swelling behavior of amphiphilic comb‐like branched polymer (AA‐co ‐ CMS)‐g‐PMMA
Author(s) -
Zhang Peng,
Feng Ying,
Sang Qian,
Dong Xiucai,
Zhou Rui,
Zhao Jiruo
Publication year - 2009
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1557
Subject(s) - polymer chemistry , copolymer , swelling , materials science , azobisisobutyronitrile , methyl methacrylate , side chain , acrylic acid , polymer , amphiphile , composite material
Copolymerization of acrylic acid and p ‐chloromethylstyrene ( p‐ CMS) in dioxane initiated with α , α ′‐azobisisobutyronitrile was carried out to produce macroinitiator P(AA‐co‐CMS) containing PhCH 2 Cl group at 65°C. Then methyl methacrylate was grafted onto P(AA‐co‐CMS) backbone using PhCH 2 Cl group as an initiation site and FeCl 2 /triphenyl phosphine complex as a catalyst. The resulted copolymer (AA‐co‐CMS)‐g‐PMMA with a comb‐like branched structure has a hydrophilic backbone (PAA) and hydrophobic side chains (PMMA). Compositions and structures of macroinitiator and the grafted product of P(AA‐co‐CMS)‐g‐PMMA were determined by 1 H‐NMR, infrared (IR), and gel permeation chromatography (GPC). The average graft number, the average length of branch chains, the graft ratio, and the graft efficiency were investigated. The swelling behavior of the comb‐like branched polymer was also investigated. The gradual increase of swelling ratios was accompanied by an increase of pH and temperature. The kinetic exponents indicated that the swelling transport mechanisms transformed from Fickian diffusion to non‐Fickian transport as the decreasing pH. Copyright © 2009 John Wiley & Sons, Ltd.