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Synthesis and characterization of hyperbranched poly(silyl ester)s
Author(s) -
Han Nianfeng,
Liu Zonglin,
Jin Liqiang
Publication year - 2006
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.24119
Subject(s) - silylation , disiloxane , differential scanning calorimetry , polymer chemistry , thermogravimetric analysis , adipate , glass transition , condensation polymer , polymer , materials science , thermal decomposition , chemistry , organic chemistry , catalysis , physics , thermodynamics
Hyperbranched poly(silyl ester)s were synthesized via the A 2 + B 4 route by the polycondensation reaction. The solid poly(silyl ester) was obtained by the reaction of di‐ tert ‐butyl adipate and 1,3‐tetramethyl‐1,3‐bis‐β(methyl‐dicholorosilyl)ethyl disiloxane. The oligomers with tert ‐butyl terminal groups were obtained via the A 2 + B 2 route by the reaction of 1,5‐dichloro‐1,1,5,5‐tetramethyl‐3,3‐diphenyl‐trisi1oxane with excess amount of di‐ tert ‐butyl adipate. The viscous fluid and soft solid poly(silyl ester)s were obtained by the reaction of the oligomers as big monomers with 1,3‐tetramethyl‐1,3‐bis‐β(methyl‐dicholorosilyl)ethyl disiloxane. The polymers were characterized by 1 H NMR, IR, and UV spectroscopies, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The 1 H NMR and IR analysis proved the existence of the branched structures in the polymers. The glass transition temperatures ( T g 's) of the viscous fluid and soft solid polymers were below room temperature. The T g of the solid poly(silyl ester) was not found below room temperature but a temperature for the transition in the liquid crystalline phase was found at 42°C. Thermal decomposition of the soft solid and solid poly(silyl ester)s started at about 130°C and for the others it started at about 200°C. The obtained hyperbranched polymers did not decompose completely at 700°C. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 3430–3436, 2006