Transparent polymer/silica hybrid gels

Klein, Lisa C.; Beaudry, Christopher L.; Yamazaki, Seiji; Wójcik, Anna

doi:10.1117/12.279831

Cited by 1 publication

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“…The time-to-gel was measured with molecular weight 3400 and 5, 10 and 15% addition of PEO [23]. Compared to pure silica gels, PEO/Si02 gels have shorter gel times for pH <3, and similar gel times for pH >4.…”

Section: Resultsmentioning

confidence: 99%

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<title>Controlling transparency in polyethylene (PEO)/silica gels</title>

Klein

Beaudry²

1997

SPIE Proceedings

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One of the simpler organic/inorganic hybrids to prepare by the sol-gel process is polyethylene (PEO)/silica. The reason for its simplicity is that PEO is soluble in water. PEO contains ether oxygens -(O-CH2-CH2-)-that readily form hydrogen bonds. The refractive index of PEO is low, 1.4537, and its glass transition temperature can be as low as -65°C, generally making it a crystalline polymer at room temperature. Hybrids of PEO/silica were prepared with molecular weights 200, 1000, 2000, and 3400. The lower molecular weights (200 and 1000) produced transparent hybrids over a range of loadings. The higher molecular weights (>2000) produced samples that were sensitive to the loading and especially the time of mixing before the samples were cast into closed containers. These trends indicate a competition between the reactions that lead to gelling and the tendency to phase separate. By following these trends, both the scale of the microstructure and the degree of transparency were adjusted.

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Section: Resultsmentioning

confidence: 99%

“…The behavior in the PEO/Si02 system contrasts with the behavior in the PVAc/Si02 system [23]. We treat this system as a model system to highlight general trends in physical hybrids.…”

Section: Physical Hybridsmentioning

confidence: 99%