On the Effect of Organic Substitution of Silicon Alkoxides in Poly(Vinyl Acetate) Organic-Inorganic Composites
| Autor: | Bradley K. Coltrain, Christine J. T. Landry |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Silicon Hydrogen bond chemistry.chemical_element General Chemistry Polymer Silicate chemistry.chemical_compound Polymerization chemistry Alkoxide Polymer chemistry Materials Chemistry Ceramics and Composites Vinyl acetate Composite material Sol-gel |
| Zdroj: | Journal of Macromolecular Science, Part A. 31:1965-1973 |
| ISSN: | 1520-5738 1060-1325 |
| DOI: | 10.1080/10601329409350111 |
| Popis: | Organic-inorganic composites (OICs) were prepared via the in-situ polymerization of an organically (phenyl) substituted trialkoxysilane, phenyltriethoxysilane (PhTEOS), in the presence of poly(vinyl acetate) (PVAc). The mechanical reinforcement above T g previously observed in OICs of unfunctionalized organic polymers such as PVAc with acid catalyzed in-situ polymerized tetraalkoxysilane was not observed when the tetraalkoxysilane was replaced with PhTEOS. Although both systems are optically transparent and both exhibit a high degree of hydrogen bonding between the carbonyl of PVAc and the residual hydroxyls of the silicate, the polymerization of the alkoxide is different. The tetra-functional alkoxide polymerizes to form a load-supporting silicate network, leading to a high plateau in the tensile modulus above T g, whereas the trifunctional alkoxide reacts to form primarily low molecular weight oligomers. These increase the T g of the PVAc but do not provide mechanical reinforcement. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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