| Abstract |
Hybrid organosilica microspheres (MSs) doped with aqueous glycerol are tested as enablers for self curing polyurethane one-component foams (OCF). The MSs have been characterized by Scanning Electron Microscopy, Fourier Transformed Infrared Spectroscopy, Thermal Gravimetric Analyses and leaching test. Shaking rate, of the pre-polymer inside the aerosol can, and curing speed tests of the sprayed foam, in a low moisture environment, were performed in order to evaluate the effect of the MSs on the OCF can s lifespan, as well as their contribution to the PU foam s curing process. The organic functionality of these silica-based MSs (methyl and glycidyloxy groups) was found to be responsible for a reduced leaching and low water absorption tendency, which is critical for a longer shelf life of the product required for commercial applications. In addition, the methyl functional MSs presented a significant increase in the curing rate of the PU foam. (C) 2016 Elsevier Inc. All rights reserved. |
