Premium
Surface science and stability of networks prepared from hydroxy‐terminated polydimethylsiloxane and methyltriethoxysilane
Author(s) -
Wynne Kenneth J.,
Ho T.,
Johnston E. E.,
Myers Sharon A.
Publication year - 1998
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/(sici)1099-0739(199810/11)12:10/11<763::aid-aoc784>3.0.co;2-c
Subject(s) - polydimethylsiloxane , chemistry , hydrolysis , catalysis , polymer chemistry , thermal stability , chemical engineering , organic chemistry , engineering
Polydimethylsiloxane (PDMS) hybrid networks have been prepared by the reaction of PDMS(OH) 2 , average molecular weight 26 × 10 3 , 43.6 × 10 3 and 58 × 10 3 , and methyltriethoxysilane (MeTEOS, 10–60 wt%) using a dibutyltin dilaurate or dibutyltin diacetate catalyst. By hydrolysis and homo‐ and co‐condensation, MeTEOS forms a siliceous domain (MeSD) and acts as a crosslinker for the PDMS domain. Kinetic studies showed that high MeTEOS and catalyst concentrations and reduction of free surface area favor fast gelation and efficiency in converting MeTEOS to the MeSD. Under the water‐sparse conditions utilized, cure was slow and substantial evaporative loss of MeTEOS occurred. © 1998 John Wiley & Sons, Ltd.