Temperature-triggered release of a liquid cross-linker micro-encapsulated in a glassy polymer for low temperature curing
| Autor: | Jozua Laven, D. Senatore, R.A.T.M. van Benthem, A. Tessa ten Cate |
|---|---|
| Přispěvatelé: | Materials and Interface Chemistry |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Hydron
Polyester resin Materials science Polymers and Plastics PVP High Tech Systems & Materials chemistry.chemical_compound Powder coating Materials Chemistry Epoxidized oil Composite material Materials chemistry.chemical_classification TS - Technical Sciences Industrial Innovation Fluid Mechanics Chemistry & Energetics Organic Chemistry technology industry and agriculture Polymer Epoxy Controlled release Polyester chemistry RMC - Responsive Materials & Coating visual_art visual_art.visual_art_medium Glass transition |
| Zdroj: | Polymer, 1, 54, 75-83 Polymer, 54(1), 75-83. Elsevier |
| ISSN: | 0032-3861 |
| Popis: | In order to prevent a liquid epoxy cross-linker from premature, Arrhenius-law predicted, reaction with an acid-functional polyester resin, the liquid cross-linker has been physically separated from the resin by encapsulation while release is only possible by a temperature-controlled trigger. The glass transition temperature Tg of the polymeric encapsulant was used to trigger the softening of the polymeric capsule. Epoxidized linseed oil (ELO) cross-linker was encapsulated as 0.1 μm diameter droplets in 16 μm diameter microparticles (poly(N-vinyl)pyrrolidone) (PVP) by means of spray-drying. The resulting nano-composite microparticles were used to cross-link the acid functional polyester in a powder coating. It was found that below Tg the encapsulation considerably slows down the (premature) cross-link reaction. Beyond Tg also a slowdown was found but in this case it was caused by the mere presence of PVP rather than by the state of encapsulation of the cross-linker: PVP as a strong hydron bond acceptor slows down the reaction of epoxy with the acid groups of the polyester. In conclusion, the Tg of the encapsulant was successfully used as a temperature trigger for realizing the controlled release of a liquid reactant in a reactive polymer matrix. © 2012 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect