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Effect of Nano-and Micro-Silica Fillers on Polyurethane Foam Properties by I. Javni; W. Zhang; V. Karajkov; Z. S. Petrovic; V. Divjakovic is a Materials Science article available to read on EtoBox.

What is Effect of Nano-and Micro-Silica Fillers on Polyurethane Foam Properties about?

Two series of rigid and flexible polyurethane foams were prepared with two types of silica fillers. The density of the flexible foams was 60 kg/m ^3^ and that of rigid 30 kg/m3. The fillers were micro-silica of the average particle size of 1.5 mm and nano-silica of the average particle size of 12 nm. The concentration of fillers varied from 0–20%. The micro-silica filler did not show any significant effect on density of either rigid or flexible foams. Nano-silica increased the density of both types of foams only at concentration above 20%. Nano-silica lowered the compression strength of both types of foams at all concentrations while micro-silica exhibited the same effect at concentrations above 10%. The hardness and compression strength in flexible polyurethane foams with nano-silica was increased and the rebound resilience decreased. Reduced density of foams was not changed by nano-silica concentrations up to 20%. It is assumed that the nano-filler, as an additional physical crosslinker, increased modulus of the flexible segment in the polyurethane matrix, resulting in increased hardness and compression strength. The micro-filler in flexible foams lowered hardness and compression

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Author

I. Javni; W. Zhang; V. Karajkov; Z. S. Petrovic; V. Divjakovic

Publisher

SAGE Publications

Published

2002

Language

EN

Field

Materials Science (Physical Sciences)