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Preparation and Properties of Aqueous Castor Oil‐based Polyurethane–Silica Nanocomposite Dispersions through a Sol–Gel Process
Author(s) -
Xia Ying,
Larock Richard C.
Publication year - 2011
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201100203
Subject(s) - nanocomposite , castor oil , polyurethane , materials science , polymer , nanoparticle , chemical engineering , polymer nanocomposite , aqueous solution , composite material , nanotechnology , organic chemistry , chemistry , engineering
Waterborne castor oil‐based polyurethane–silica nanocomposites with the polymer matrix and silica nanoparticles chemically bonded have been successfully prepared through a sol–gel process. The formation of silica nanoparticles in water not only reinforces the resulting coatings, but also increases the crosslink density of the nanocomposites. The 29 Si solid state NMR spectrum indicates the formation of silica and the TEM indicates that the nanoparticles are embedded in the polymers, resembling a core–shell structure. The silica nanoparticles in the polymer matrix play an important role in improving both the mechanical properties and the thermal stabilities of the resulting nanocomposites. This work provides an effective and promising way to prepare biorenewable, high performance nanocomposite coatings.