Fine colloidal silica as reinforcing filler in polyurethane polymers

Autor:	J.-E. A. Otterstedt, O. E. Otterstedt, C.-H. Andersson, J. Ekdahl, J. Backman
Rok vydání:	1987
Předmět:	chemistry.chemical_classification Materials science Polymers and Plastics Colloidal silica General Chemistry Polymer Silicate Surfaces Coatings and Films Polyester chemistry.chemical_compound chemistry Materials Chemistry Particle size Composite material Tetrahydrofuran Polyurethane Fumed silica
Zdroj:	Journal of Applied Polymer Science. 34:2575-2582
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.1987.070340720
Popis:	Colloidal silica in the particle size range 1.4–10 nm was extracted in to tetrahydrofuran (THF). Alkali silicate solutions with SiO2 : M2O (M = Li, Na, K, Cs) ratios ranging from 3:1 to 20:1 were used as source of silica particles in the size range 1.4–4.4 nm whereas commercial silica sols were used for particles in the range 5–10 nm. Films of polyester- and polyether-based polyurethane-containing colloidal silica were prepared and their mechanical properties measured. The reinforcing effect increased with increasing silica content and showed a maximum between 1.5 and 2.5 nm for polyether-based polyurethane and between 4 and 6 nm for polyester-based polyurethane. The area under the hysteresis loops of the stress–strain curves also showed maximum in the same particle size ranges for the two types of polyurethane. Reinforcement mechanisms are discussed in terms of interactions between small particles and hard or soft segments of the polymer chains.
Databáze:	OpenAIRE
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