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Toward uniform polymer architecture through stereospecific living polymerization and chromatographic separation technique
Author(s) -
Hatada Koichi,
Nishiura Takafumi,
Kitayama Tatsuki,
Ute Koichi
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971180119
Subject(s) - macromonomer , materials science , polymer chemistry , polymer , methyl methacrylate , tacticity , polymerization , poly(methyl methacrylate) , gel permeation chromatography , molar mass distribution , chemical engineering , composite material , engineering
Isotactic ( it ‐) and syndiotactic ( st‐ ) poly(methyl methacrylate)s (PMMAs) were fractionated into uniform PMMAs (without molecular weight distribution) by supercritical fluid chromatography (SFC). The SFC technique was applied to the isolation of uniform it ‐ and st ‐PMMAs with a hydroxy group ( it ‐ and st ‐PMMA‐OH) at the chain end. Equimolar amounts of uniform it ‐ and st ‐PMMA‐OHs were coupled with sebacoyl dichloride to form uniform stereoblock PMMA. The reaction of uniform st ‐PMMA‐OH with methacryloyl chloride gave uniform PMMA macromonomer with methacryloyl group at the chain end. The resulting uniform macromonomer was polymerized radically and the products were fractionated into uniform comblike polymers (1mer to 4mer) by means of gel‐permeation chromatography (GPC). The uniform st ‐PMMA‐OH was reacted with 1, 3, 5‐benzenetricarbonyl trichloride to form uniform st ‐tri‐armed star polymer. Some of the properties of these uniform stereoregular polymer architectures were studied.