ISSN:
1573-4846
Keywords:
sol-gel
;
silica-poly(ethylene oxide) hybrid material
;
epoxide polymerization
;
optical properties
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Structural evolution and optical properties of the silica-poly(ethylene oxide) hybrid films prepared from γ-glycidoxypropyltrimethoxysilane (GPTS) and 1-methylimidazol (MI) are studied. Polymerization of the epoxy groups is achieved by using 1-methylimidazol as a thermal curing agent. In liquid state 1H &13 C NMR spectroscopy, it is found that silica condensation mainly occurs without epoxy ring opening. The epoxide polymerization is confirmed by using FT-IR, solid state CP-MAS 13C-NMR, and differential scanning calorimetry (DSC). The hybrid material is densified due to the epoxide polymerization as well as silica condensation with thermal curing. As a result, the thermal curing increases refractive index and extinction coefficient and shifts UV optical absorption edge to longer wavelength.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1008717219952
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