Effect of clay dispersion on the rheological properties and flammability of polyurethane-clay nanocomposite elastomers

Autor:	Marco Berta, Chris Ian Lindsay, Alberto Saiani, R. D. Gunaratne
Rok vydání:	2009
Předmět:	Materials science Nanocomposite Polymers and Plastics General Chemistry Elastomer Exfoliation joint Surfaces Coatings and Films chemistry.chemical_compound Montmorillonite chemistry Materials Chemistry UL 94 Thermoplastic elastomer Composite material Flammability Polyurethane
Zdroj:	Journal of Applied Polymer Science. 112:2847-2853
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.29771
Popis:	Polyurethane-clay nanocomposite elastomers were synthesized using polyol-clay blends with different levels of dispersion, which affected the final elastomer microstructure. A PU-clay microcomposite elastomer containing partially dispersed clay showed poorer mechanical and similar fire properties to the unmodified polyurethane. More complete dispersion of the clay into the polyol led to an exfoliated structure in the final elastomer. This showed a higher modulus and kept a viscoelastic behavior to higher temperature than the pristine PU. The enhancement of mechanical and thermal properties in the nanocomposite elastomer can be attributed to the degree of clay exfoliation, and this also prevented dripping during the UL 94 fire test. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Databáze:	OpenAIRE
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