Modifications of hydrosiloxane polymers for coating applications
| Autor: | D B MacQueen, Y D Blum |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
chemistry.chemical_classification
Reaction mechanism Materials science Hydrosilylation General Chemical Engineering Chemical modification Surfaces and Interfaces Polymer engineering.material Surfaces Coatings and Films Catalysis chemistry.chemical_compound chemistry Transition metal Chemical engineering Coating Chemistry (miscellaneous) Polymer chemistry engineering Curing (chemistry) |
| Zdroj: | Surface Coatings International Part B: Coatings Transactions. 84:27-33 |
| ISSN: | 1476-4865 |
| Popis: | An alternative approach to the formation of resins by hydrolysis-condensation reactions has been developed and evaluated. It combines the use of inexpensive polysiloxanes and transition metal catalysts to easily modify polymers in a one-pot reaction. Polyhydridomethylsiloxane (PHMS) serves as the base polymer, and it can be cured or modified by dehydrocoupling or a combination of hydrosilylation-dehydrocoupling reactions, both catalysed by transition metal catalysts (Pt and Ru). The modified polymers are linear and contain very high mol% of Si-OH and combinations of Si-OH and Si-OR pendant groups. These groups assist the bonding to surfaces when the modified polymers are deposited as coatings. They then cure by condensation and hydrolysis-condensation reactions, catalysed by both acids and bases. The modified polymers are used for low-temperature paintlike applications, especially where ambient curing is desirable. This article discusses modifications of PHMS for coating applications and describes potential coating applications and typical coating strategies. |
| Databáze: | OpenAIRE |
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