Polyurea/polysiloxane ceramer coatings

Tetraethylorthosilicate (TEOS) oligomers were prepared through the hydrolysis and condensation of TEOS with water. The mixture of TEOS oligomers was characterized by FT-IR, 29Si NMR and electrospray ionization-mass spectrometry (ESI-MS). The ESI-MS and 29Si NMR data show molecular weight ranges from...

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Bibliographic Details
Published in:Progress in organic coatings 2000, Vol.38 (2), p.97-110
Main Authors: Ni, Hai, Simonsick, William J., Skaja, Allen D., Williams, Jonathan P., Soucek, Mark D.
Format: Article
Language:English
Subjects:
Applied sciences
Coatings
Coatings. Paints, varnishes and inks
Exact sciences and technology
Film formation and curing, properties, testing
Isocyanate
Polymer industry, paints, wood
Polysiloxane
Polyurea
Tetraethylorthosilicate
Thermal properties
Viscoelastic properties
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Summary:Tetraethylorthosilicate (TEOS) oligomers were prepared through the hydrolysis and condensation of TEOS with water. The mixture of TEOS oligomers was characterized by FT-IR, 29Si NMR and electrospray ionization-mass spectrometry (ESI-MS). The ESI-MS and 29Si NMR data show molecular weight ranges from 400 to 2000 g/mol and many cyclic species exist in addition to linear oligomers. The mechanical and tensile properties were evaluated as functions of TEOS oligomer concentration and silane-functionalized isocyanurate concentration. In addition, viscoelastic properties, thermal properties and morphology of the ceramer coatings were investigated using dynamical mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) with energy dispersion X-ray analysis (EDAX). The data showed that ceramer coating properties were affected by both TEOS oligomer content and silane-functionalized isocyanurate content. Also, the adhesion was enhanced by incorporating the TEOS oligomers into the polyurea/polysiloxane coatings.
ISSN:0300-9440
1873-331X
DOI:10.1016/S0300-9440(00)00079-5