Thermal Decomposition Kinetics of Polyurethane Elastomers Prepared with Different Dianiline Chain Extenders Ahn, WonSool;
Thermal decomposition kinetics for two different types of polyurethane elastomers prepared with 2,2`-dichloro-4,4`-methylenedianiline (MOCA) and 3,5-dimethyl-thiotoluenediamine (Ethacure-300), based on PTMG/TDI isocyanate prepolymer, were studied using non-isothermal thermogravimetric analysis (TGA). Thermograms were obtained and analyzed using Friedman (FR) and Kissinger-Akahira-Sunose (KAS) methods for activation energy, . The results obtained showed that decomposition reaction of both samples was observed similarly to occur through three different stages, i.e., initial stage with vaporization of low molecular weight materials, second stage of urethane linkage decompositions, and later stage of polyol segment decompositions. However, activation energy values at each stage for the sample cured with Ethacure-300 was much lower than those for the sample with MOCA, exhibiting relatively lower thermal stability for the sample with Ethacure-300 than that with MOCA.
M. Barikani, N. Fazeli, and M. Barikani, "Study on thermal properties of polyurethane-urea elastomers prepared with different dianiline chain extenders", J. Polym. Eng., 33(1), 87 (2013).
K. Gisselfalt and B. Helgee, "Effect of Soft Segment Length and Chain Extender Structure on Phase Separation and Morphology in Poly (urethane-urea)s", Macromol. Mater. Eng., 288(3), 265 (2003).
X.-D. Chen, N.-Q. Zhou, and H. Zhang, "Preparation and properties of cast polyurethane elastomers with molecularly uniform hard segments based on 2,4-toluene diisocyanate and 3,5-dimethyl-thiotoluene diamine", J. Biomed. Sci. Eng., 2, 245 (2009).
T. O. Ahn, I. S. Choi, H. M. Jeong, and K. Cho, "Thermal and mechanical properties of thermo- plastic polyurethane elastomers from different polymerization methods", Polym. Int., 31, 329 (1993).
S. Yamasaki, D. Nishiguchi, K. Kojio, and M. Furukawa, "Effects of polymerization method on structure and properties of thermoplastic polyurethanes", J. Polym. Sci. Part B: Polymer Physics, 45, 800 (2007).
C. Demarest, "Life Beyond MOCA", PU Manufacturers Association Annual Meeting, Phoenix, Az May, 1 (2014).
X.-M. Qin, J.-W. Xiong, X.-H. Yang, X.-L. Wang, and Z. Zheng, "Preparation, Morphology, and Properties of cast Polyurethane-Urea Elastomers derived from Sulphone-Containing Aromatic Diamine", J. Appl. Polym. Sci., 104, 3554 (2007).
R. A. Beck and R. W. Truss, "The Effect of Curatives on the Fracture Toughness of PTMG/TDI Polyurethane Elastomers", Polymer, 36(4), 767 (1995).
J. A. F. F. Rocco, J. E. S. Lima, V. L. Lourenco, N. L. Batista, E. C. Botelho, and K. Iha, "Dynamic Mechanical Properties for Polyurethane Elastomers Applied in Elastomeric Mortar", J. Appl. Polym. Sci., 126, 1461 (2012).
S. V. Levchik and E. D. Weil, "Thermal decomposition, combustion and fire-retardancy of polyurethanes-a review of the recent literature", Polym. Int., 53, 1585 (2004).
Y. Zhang, Z. Xia, H. Huang, and H. Chen, "Thermal degradation of polyurethane based on IPDI", J. Anal. Appl. Pyrolysis, 84, 89 (2009).
W. D. Woolley, "Nitrogen-Containing Products from the Thermal. Decomposition of Flexible Polyurethane Foams", Br. Polym. J., 4, 27 (1972).
M. Paabo and B. C. Levin, "A Literature Review of the Chemical Nature and Toxicity of the Decomposition Products of Polyethylenes", Fire and Materials, 11(2), 55 (1987).
H. L. Friedman, "Kinetics of Thermal Degradation of Charforming Plastics from Thermogravimetry: Application to a Phenolic Plastic", J. Polym. Sci. Part C: Polymer Symposia., 6(1), 183 (1964).
M. J. Starink, "The determination of activation energy from linear heating rate experiments: A comparison of the accuracy of isoconversion methods", Thermochimica Acta., 404(1-2), 163 (2003).
A. K. Barick and D. K. Tripathy, "Effect of organoclay on the morphology, mechanical, thermal, and rheological properties of organophilic montmorillonite nanoclay based thermoplastic polyurethane nanocomposites prepared by melt blending", Polym. Eng. Sci., 50(3), 484 (2010).