Premium
Polyesters based on two silarylene or germarylene moieties: Synthesis under phase‐transfer conditions
Author(s) -
Tagle L. H.,
Terraza C. A.,
Leiva A.,
Alvarez P.
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.30645
Subject(s) - heteroatom , polyester , polymer chemistry , catalysis , phase (matter) , aqueous solution , hydrolysis , glass transition , chemistry , condensation polymer , phase transfer catalyst , materials science , organic chemistry , polymer , alkyl
Polyesters (PEs) containing two heteroatoms (Si and/or Ge) in the main chain, derived from the acid dichlorides bis(4‐chloroformylphenyl) ethylmethylsilane, bis(4‐chloroformylphenyl) diethylsilane, bis(4‐chloroformylphenyl) diethylgermane, and bis(4‐chloroformylphenyl) di‐ n butylgermane and from the diphenols bis(4‐hydroxyphenyl) ethylmethylsilane, bis(4‐hydroxyphenyl) diethylsilane, bis(4‐hydroxyphenyl) diethylgermane, and bis(4‐hydroxyphenyl) di‐ n butylgermane, were synthesized under phase‐transfer conditions with three quaternary ammonium salts as phase‐transfer catalysts and three NaOH concentrations in the aqueous phase. PEs were characterized with IR and NMR spectroscopy, including 29 Si‐NMR. In general, the yields and intrinsic viscosities were low, and in some cases, an increase in these parameters was shown as a result of the catalyst effect. An increase in the NaOH concentration caused a decrease in the yields because of a hydrolytic process. PEs with Si were thermally more stable than those with Ge. The glass‐transition temperatures decreased when the side chains bonded to the heteroatoms were longer. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009