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Synthesis of polysiloxanes with pendant methoxy‐substituted aromatic fragments
Author(s) -
Mukbaniani O.,
Titvinidze G.,
Dundua A.,
Doroshenko M.,
Tatrishvili T.
Publication year - 2007
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.27133
Subject(s) - hydrosilylation , polymer chemistry , differential scanning calorimetry , chemistry , thermogravimetry , gel permeation chromatography , glass transition , catalysis , organic chemistry , polymer , inorganic chemistry , physics , thermodynamics
The synthesis of new polysiloxanes was performed via hydrosilylation reactions of polymethylhydrosiloxane with 4‐allyl‐1‐methoxybenzene and 4‐allyl‐1,2‐dimethoxybenzene in the presence of Karstedt's catalyst {Pt 2 [(VinSiMe 2 ) 2 O] 3 } and platinum hydrochloric acid (0.1 M solution in tetrahydrofuran). The hydrosilylation reactions were carried out at 60°C. The molar ratio of SiH groups to the allylic compound was 1 : 1.2. The synthesized oligomers were characterized with 1 H‐NMR, Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetry, and gel permeation chromatography. In the presence of platinum hydrochloric acid, not all active SiH bonds took part in hydrosilylation, and because of this, gelation took place and the molecular masses of the extracted parts increased 7–8 times; in contrast to this, in the presence of Karstedt's catalyst, all active SiH bonds participated in hydrosilylation, and an increase in the molecular masses did not occurs. The influence of substituted methoxy groups on the glass‐transition temperatures was studied. © 2007 Wiley Periodicals, Inc. JAppl Polym Sci, 2008