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Preparation and properties of Waterborne polyurethane/nanosilica composites: A diol as extender with triethoxysilane group
Author(s) -
Wang Gang,
Ma Guozhang,
Hou Caiying,
Guan Taotao,
Ling Lixia,
Wang Baojun
Publication year - 2014
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.40526
Subject(s) - polyurethane , triethoxysilane , extender , materials science , ultimate tensile strength , diol , isophorone diisocyanate , polypropylene glycol , hydroxymethyl , thermal stability , composite material , polymer chemistry , emulsion , chemical engineering , organic chemistry , chemistry , polyethylene glycol , engineering
Waterborne polyurethane (WPU) was prepared from toluene diisocyanate, polypropylene glycol, 2,2‐bis(hydroxymethyl)propionic acid and a diol containing triethoxysilane group as the chain extender which was synthesized via Michael addition between 3‐triethoxysilylpropylamine and 2‐hydroxyethylacrylate. Different amounts of nanosilica were incorporated into the WPU to prepare WPU/nanosilica composites. The results showed that the particle size of the emulsions increased and their viscosity decreased first and then increased with increasing the amount of nanosilica. Incorporation of nanosilica into WPU enhanced the water contact angle and thermal stability of the composites films, meanwhile, their tensile strength and hardness increased first and then decreased. However, increasing the amount of nanosilica resulted in reduction in the elongation at break of the films. It suggested that nanosilca was anchored into the side chain of WPU due to the condensation process between the triethoxysilane group in the side chain of WPU molecular and the silanols group on the surface of nanosilica. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40526.