Synthesis and structure characterization of ladder-like polymethylsilsesquioxane (PMSQ) by isolation of stereoisomer

Title
Synthesis and structure characterization of ladder-like polymethylsilsesquioxane (PMSQ) by isolation of stereoisomer
Authors
이희승최승석백경열홍순만이응찬이종찬황승상
Keywords
Polymethylsilsesquioxane; Stereoisomer; Polycondensation; Silsesquioxane; Ladder-like
Issue Date
2012-06
Publisher
European polymer journal
Citation
VOL 48, NO 6, 1073-1081
Abstract
The stereo cyclic siloxane compounds having tetra hydroxyl and tetra methyl group were synthesized by hydrolysis of tetrahydrido tetramethyl cyclosiloxane consisting of four stereoisomers. Among the stereo cyclic isomers, cis-trans-cis tetrahydroxyl tetramethyl cyclosiloxane (2) was separated by recrystallization and was used as a monomer species for preparation of ladder-like polymethylsilsesquioxane (PMSQ). The isolated isomer was directly polymerized in THF with potassium carbonate (K2CO3) by systematic ring condensation. The hydrolyzed stereoisomers were characterized by 1H and 29Si NMR, and HPLC. The structure of the synthesized PMSQs were characterized by size exclusion chromatography (SEC), MALDI-TOF mass, 29Si NMR, and small angle X-ray scattering (SAXS).
URI
http://pubs.kist.re.kr/handle/201004/42383
ISSN
00143057
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KIST Publication > Article
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