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Synthesis of MQ silicone resins through hydrolytic condensation of ethyl polysilicate and hexamethyldisiloxane
Author(s) -
Huang Wei,
Huang Ying,
Yu Yunzhao
Publication year - 1998
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/(sici)1097-4628(19981128)70:9<1753::aid-app13>3.0.co;2-v
Subject(s) - hexamethyldisiloxane , hydrolysis , polymer chemistry , molar mass distribution , silicone , catalysis , chemistry , organic chemistry , condensation , materials science , polymer , thermodynamics , physics , plasma , quantum mechanics
MQ silicone resins were synthesized through hydrolytic condensation of ethyl polysilicate and hexamethyldisiloxane. The structure of the MQ resins was characterized by NMR and GPC. The concentration of an acid catalyst was essential for the capping of functional groups with the monofunctional units. The acid‐catalyzed resins had a narrow molecular weight distribution. After postcondensation catalyzed by a base, the molecular weight distribution became bimodal. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 70: 1753–1757, 1998