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Base catalyzed proton transfer polymerization of 1‐hydroxypentamethylcyclotrisiloxane. Comparison of hyperbranched polymer microstructure and properties to those of highly regular linear analogs
Author(s) -
Paulasaari Jyri K.,
Weber William P.
Publication year - 2000
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20000901)201:14<1585::aid-macp1585>3.0.co;2-3
Subject(s) - cationic polymerization , phosphazene , superbase , triethylamine , polymer chemistry , polymerization , monomer , polymer , chemistry , ring opening polymerization , catalysis , materials science , organic chemistry
Treatment of 1‐hydroxypentamethylcyclotrisiloxane ( 1 ), an A 2 B monomer, with a phosphazene P 4 ‐ t ‐Bu superbase followed by quenching with phenyldimethylchlorosilane/triethylamine leads to a hyperbranched polysiloxane ( 2 ). The microstructure and properties of 2 are compared to those of highly regular linear analogs obtained by anionic or cationic regiospecific ring opening polymerization of 1‐(phenyldimethylsiloxy)pentamethylcyclotrisiloxane ( 3 ).