University of Jos Institutional Repository >
Natural Sciences >
Chemistry >

Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/268

Title: Effects of CaCO3 and Kaolin Filler Loadings on Curing Rates of Polyurethane Foams
Authors: Dalen, M.B.
Ibrahim, A.Q
Adamu, H.M
Nurudeen, A.A
Keywords: isocyanate content,
curing rates,
conventional polyol (CPO),
polymer polyol (PPO).
Issue Date: 27-Jun-2014
Publisher: International Research Journal of Pure & Applied Chemistry
Citation: Pp 691-709
Series/Report no.: Vol.4;No.6
Abstract: Commercial kaolin (Al2Si2O5(OH)4), a clay mineral obtained on the Upper Plateau (Jos, Central Nigeria) was characterized for physical properties such as moisture content (= 1.30%), sieved particle size (= 150μm) and (Apparent Bulk Density (= 0.40g/cm3) and compared to CaCO3, a rock mineral and a conventional filler presently used extensively in the foam industry in Nigeria, with moisture content (= 0.60%), sieved particle size (= 150μm) and (Apparent Bulk Density (= 0.75g/cm3). CPO and PPO foam formulations using conventional (CPO) and polymer (PPO) polyols with variations of kaolin and CaCO3 filler loading were investigated for curing rates. The results showed that curing decrease immediately after cream times for both fillers.The results also showed that the rate of curing is faster for kaolin filled foams than CaCO3 filled foams with the free isocyanate content exhibiting increases with filler loading indicating that fillers delay curing rates. However, this effect was observed to be more pronounced for CaCO3 filler than kaolin for the two types of polyols considered especially after aging for 720mins.This demonstrates that polymerization is usually incomplete because of the active isocyanate groups still present.
URI: http://hdl.handle.net/123456789/268
Appears in Collections:Chemistry

Files in This Item:

File Description SizeFormat
Effects of CaCO3 and Kaolin Filler Loadings on.pdf1.68 MBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback