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Block copolymer of 2‐methyl‐2‐oxazoline with silica gel an organic‐inorganic hybrid polymer
Author(s) -
Chujo Yoshiki,
Ihara Eiji,
Kure Shigeo,
Suzuki Keisuke,
Saegusa Takeo
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910420125
Subject(s) - copolymer , polymer chemistry , materials science , silanol , silane , polymerization , hybrid material , polymer , bifunctional , triethoxysilane , chemistry , organic chemistry , catalysis , composite material , nanotechnology
Ring‐opening polymerization of 2‐methyl‐2‐oxazoline followed by termination with 3‐aminopropyltriethoxysilane produced poly(N‐acetylethylenimine) (polyoxazoline) (POZO) having a terminal triethoxysilyl group. Triethoxysilyl‐terminated telechelic POZO was also prepared by using bifunctional initiators. These silane coupling POZOs were subjected to reaction with silanol groups at the surface of silica gel to modify its surface hydrophilicity. Triethoxysilyl‐terminated POZOs were also subjected to acid‐catalyzed co‐hydrolysis polymerization with tetraethoxysilane by the so‐called sol‐gel method to produce a novel organic‐inorganic hybrid polymer (block copolymer). The hybrid obtained was a homogeneous, transparent, glassy composite material, which showed more hydrophilicity in comparison with that of silica gel without POZO segments. On the other hand, a hybrid polymer consisting of poly(2‐ethyl‐2‐oxazoline) and silica gel showed amphiphilic properties absorbing both water and organic solvents. Pyrolysis of these hybrids at 600°C produced silica having micro‐pores.