Effect of different isocyanates on the properties of soy‐based polyurethanes

Abstract

New types of polyurethanes were prepared by reacting soybean oil-based polyol and different isocyanates. The polyurethanes can be used as foams, elastomers, coatings, adhesives, etc. Their properties strongly depend on crosslinking density and the structure of isocyanates. Aromatic triisocyanates impart the highest density, glass transition, modulus, and tensile strength, but have the lowest elongation at break, swelling in toluene, and impact resistance. Aliphatic triisocyanates and diisocyanates give rubbery materials with the highest elongation at break, highest swelling, and the lowest tensile strength. Polyurethanes with aromatic and cycloaliphatic diisocyanates were similar in properties, with values between those of the two groups.

Cyclic Carbonates Based on Vegetable Oils

“…%, atmospheric pressure, 110 °C), assumed that Tamami's results on the achievement of conversion of 94 % are wrong. The comparison of EG conversion data received by infrared spectroscopy method and a titrimetric method (100 and 78 % respectively) made the basis of such assumption and showed that the chemical method gives more precise results [7]. The data of physical-mechanical NIPU testing testify indirectly to a lower than 94 % conversion of EG for CC obtained by Tamami [7].…”

“…The main part of researches is devoted to epoxidized soybean oil (ESBO) carbonation [6][7][8][9][10][11][12], in some works the epoxidized linseed oil (ELSO) [5,13] is used. Such choice is defined by the availability of these oils which are large-capacity products [14], they are widely applied at halogenated polymers processing (for example, polyvinylchloride).…”

“…Despite the wide range of catalysts, applied to obtain CC [1,2,4], catalytic systems on the basis of tetrabutylammonium bromide (TBAB) have become widely applied for CCVO synthesis [5][6][7][9][10][11][12][13]15], they are a large-capacity industrial product. The optimum of TBAB dosage is 2÷7 mol %, as relating to epoxy groups of a substrate.…”

“…The first work on the receiving of CCVO was carried out at the atmospheric pressure [6] in 2004. In the following years the carbonation of epoxidized oils at the atmospheric pressure was carried out by a number of researchers [5][6][7][8][9]13], who noted a considerable period of time (as a rule, some days) necessary for the achievement of high values of EG oil conversion, and the fast growth of viscosity in the process of carbonation.…”

“…Javni and Tamami did not note the formation of oligomeric products, the results of gelpermeation chromatography (GPC) [6,7] testified to this. There are no data on the optimum of CCVO synthesis temperature at atmospheric pressure.…”