In this report, attempts have been made to study the influence of various factors like level of catalyst system and blowing agent, and functionality and viscosity of polyols, on the structures of various soy polyol-based polyurethane foams. Efforts are made to correlate the relative rigidity of various foams with the foaming reactions probed by infrared (IR) spectroscopy. IR observations have been complemented by thermal analysis and electron microscopic studies. Measurements on density and compressive strength have been conducted to verify the rigidity of different foam systems indicated by IR and thermal analysis.
Singh, A.P. and Bhattacharya, M. (2004). Viscoelastic Changes and Cell Opening of Reacting Polyurethane Foams from Soy Oil, Polym. Eng. Sci., 44: 1977—1986.
2.
Guo, A., Javni, I. and Petrovic, Z. (2000). Rigid Polyurethane Foams Based on Soybean Oil , J. Appl. Polym. Sci., 467: 467—473.
3.
Backus, J.K., Blue, C.D., Boyd, P.M., Cama, F.J., Chapman, J.H., Eakin, J.L., Harasin, S.J., McAfee, E.R., McCarthy, C.G., Rieck, J.N., Schmelzer, H.G. and Squiller, E.P. (1988). Polyurethanes, Encyclopedia of Polymer Science and Engineering, Vol. 243, Wiley, New York.
4.
Falke, P., and Kudoke, C., Rotermund, I. and Zaschke, B. (1999). Some Aspects of Matrix Formation of Flexible Polyurethane Foams, J. Cell. Plast., 35: 43—68.
5.
Mondal, P. and Khakhar D.V. (2004). Regulation of Cell Structure in Water Blown Rigid Polyurethane Foam, Macromol. Symp., 216: 241—254.
6.
Araujo, R.C.S. , Pasa, V.M.D. and Melo. V.N. (2005). Effects of Biopitch on the Properties of Flexible Polyurethane Foams, Eurp. Polym. J., 41: 1420—1428.
7.
Ning, L., Ning, W.D. and Kang, Y.S. (1997). Hydrogen Bonding Properties of Segmented Polyether Poly(urethane-urea) Copolymer, Macromolecules, 30: 4405—4409.
8.
Banik, I. and Sain, M.M. (2007) Structure of Glycerol and Cellulose Fiber Modified Water Blown Soy Polyol Based Polyurethane Foams, J. Reinf. Plast. Comp., accepted.
9.
Oka, H., Tokunaga, Y., Masuda, T., Kiso, H. and Yoshimura, H. (2006). Characterization of Local Structures in Flexible Polyurethane Foams by Solid-State NMR and FTIR Spectroscopy, J. Cell. Plast., 42: 307—323.
10.
Oprea, S. (2000). Effect of Structure on the Thermal Stability of Polyester Urethane Urea Acrylates, Polym. Degrad. Stab., 75: 9—15.
11.
Gaboriaud, F. and J.P. Vantelon, J. P. ( 1982). Mechanism of Thermal Degradation of Polyurethane Based on MDI and Propoxylated Trimethylol Propane, J. Polym. Sci . Part A, 20: 2063—2071.
12.
Chattopadhyay, D.K., Sreedhar, B. and Raju, K.V.S.N. (2005). Thermal Stability of Chemically CrossLinked Moisture Cured Polyurethane Coatings, J. Appl. Polym. Sci., 95: 1509—1518.
13.
Sain, M. and Panthapulakkal, S. (2006). Bioprocess Preparation of Wheat Straw Fibers and Their Characterization, Ind. Crops. Product, 23: 1—8.
