Effect of Polyol/Di-Isocyanates Concentration and Temperature on the Synthesis of Polyurethane Foam

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2014 by IJETT Journal
Volume-17 Number-3
Year of Publication : 2014
Authors : S. Abdehamid Ahmed


S. Abdehamid Ahmed. "Effect of Polyol/Di-Isocyanates Concentration and Temperature on the Synthesis of Polyurethane Foam", International Journal of Engineering Trends and Technology (IJETT), V17(3),115-119 Nov 2014. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group


A number of polyurethanes (PUs) from renewable resource e were synthesized by reacting castor oil with polymeric 4,4 ?diphenylmethane diisocynate (PMDI). Different NCO/OH ratios such as 1.2, 1.5, 1.8 and 2 was applied. Preparation of polyurethane werecarried out at 17, 30, 40, 50, 65 and 72 oC for each NCO/OH ratio. Milled fiber glass with average size 200 µm was dispersed in the pre-polymer with weight fractions 5 up to 50% by intense mixing (1000 rpm) in open and isothermal systems in order to study the effect of the filler contents on the gel time. The results showed that both of the temperature and the NCO/OH ratio have a significant effect on the gel time. Filler loading showed no significant effect on the gel time of the isothermal system. Predictable gel time model which is function in the temperature and NCO/OH ratio was achieved. This model can play an important role to estimate the safe conversion for reactor operation and the cycle time during the polyurethane production.


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Castor oil, PMDI, Polyurethane, Fiber glass, Gel time, EDS, SEM