NDLI: Effect of Nano and Micro-Silica Fillers on Polyurethane Foam Properties

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Effect of Nano and Micro-Silica Fillers on Polyurethane Foam Properties

Content Provider	Scilit
Author	Javni, I. Zhang, W. Karajkov, V. Petrovic, Z. S. Divjakovic, V.
Copyright Year	2020
Description	Two series of polyurethane foams both rigid and flexible were prepared with two types of silica fillers. The density of the flexible foams was 60 $kg/m^{3}$ and that of rigid 30 $kg/m^{3}$. The fillers were micro silica, of the average particle size of 1.5 pm 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 both rigid and 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 filled with nano-silica was not changed up to 20% of the concentration. 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 strength, but increased rebound resilience. Wide angle x-ray scattering (WAXS) showed amorphous morphology of both flexible and rigid foams filled with nano-silica. WAXS of the micro-silica filled foams showed the presence of randomly oriented crystalline quartz particles and the amorphous structure of the polymeric matrix. Book Name: Polyurethanes Expo 2001
Related Links	https://content.taylorfrancis.com/books/download?dac=C2006-0-04523-6&isbn=9780429332609&doi=10.1201/9780429332609-80&format=pdf
Ending Page	561
Page Count	5
Starting Page	557
DOI	10.1201/9780429332609-80
Language	English
Publisher	Informa UK Limited
Publisher Date	2020-06-29
Access Restriction	Open
Subject Keyword	Book Name: Polyurethanes Expo 2001 Characterization and Testing of Materials Polyurethane Nano Silica Micro Silica Flexible Foams Foams Both Rigid
Content Type	Text

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