@Article{JRM.2014.634132,
AUTHOR = {Tamara Calvo-Correas, Mirna A. Mosiewicki, M. Angeles Corcuera, Arantxa Eceiza, Mirta I. Aranguren},
TITLE = {Linseed Oil-Based Polyurethane Rigid Foams: Synthesis and  Characterization},
JOURNAL = {Journal of Renewable Materials},
VOLUME = {3},
YEAR = {2015},
NUMBER = {1},
PAGES = {3--13},
URL = {http://www.techscience.com/jrm/v3n1/49612},
ISSN = {2164-6341},
ABSTRACT = {Rigid polyurethane foams were synthesized by using a vegetable oil-based polyol and 4,4-diphenylmethane 
diisocyanate prepolymer as the majority of reactives,. The polyol was produced by hydroxylation of crude 
linseed oil with performic acid generated in situ by the reaction of hydrogen peroxide and formic acid. The 
characterization by FTIR, H1
NMR, iodine and hydroxyl values of the polyol and its comparison with the 
original linseed oil supports the success of the reaction. The reference foam was subsequently modifi ed by 
substituting part of the linseed oil polyol with glycerol, diethylene glycol, and a polyethylene glycol (all of 
them of lower molecular weight than the natural polyol). As was expected, glycerol acts as a crosslinker, 
increasing density and compression properties of the foams. The analysis of the compression results 
highlighted the importance of the concentration of the polymeric isocyanate (pMDI) in the initial formulation. 
The pMDI concentration also played a role in the char formation of the foams according to thermogravimetric 
analysis. The higher crosslinking density of the glycerol-modifi ed foam resulted in better thermal stability 
among the different foams.},
DOI = {10.7569/JRM.2014.634132}
}