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Hyper Branched Silica Precursor Poly(alkoxysiloxane): Influence of Alkyl Group Modification on Thermal Stability and Conversion to Silica
Author(s) -
SwatonHöckels Michael,
Peter Karin,
Möller Martin
Publication year - 2017
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201600186
Subject(s) - alkyl , monomer , thermal stability , polymer chemistry , gravimetric analysis , thermogravimetric analysis , chemistry , chemical engineering , condensation reaction , chemical modification , organic chemistry , materials science , catalysis , polymer , engineering
Alkyl group modified hyper branched poly(alkoxysiloxane)s (PAOS) were synthesized via a one‐pot co‐monomer route based on a non‐aqueous condensation reaction. By using tri(ethoxyalkylsilane) as co‐monomer we are able to introduce a high amount of alkyl groups into the PAOS molecule. The chemical structure and degree of modification were analyzed by 29 Si‐NMR and GPC. According to thermal gravimetric analysis (TGA) the conversion of PAOS to silica is highly affected by type and the content of the modifying units. With increasing of both the chain length and the quantity of alkyl groups the rate of conversion of PAOS to silica is decreased. Additionally, we discuss the influence of atmosphere and temperature on the degree of conversion to silica within a defined time.