Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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A Study on Transformation of Dynamic DSC Results into Isothermal Data for the Formation Kinetics of a PU Elastomer

  • Ahn, WonSool (Department of Chemical Engineering, Keimyung University)
  • Received : 2018.04.27
  • Accepted : 2018.05.16
  • Published : 2018.06.30
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Abstract

The present study examines the transformation of dynamic DSC data into the equivalent isothermal data for the formation kinetics of a polyurethane elastomer. The reaction of 2'-dichloro-4,4'-methylenedianiline (MOCA) with a PTMG/TDI-based isocyanate prepolymer was evaluated. DSC measurement was performed in the dynamic scanning mode with several different heating rates to obtain the reaction thermograms. Then, the data was transformed into the isothermal data through a procedure based on Ozawa analysis. The main feature of this procedure was the transformation of $({\alpha}-T)_{\beta}$ curves from dynamic DSC into $({\alpha}-t)_T$ curves using the isoconversional $(t-T)_{\alpha}$ diagram. Validity was discussed for the relationship between the dynamic DSC data and the transformed isothermal results.

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References

  1. D. K. Chattopadhyay and K. V. S. N. Raju, "Structural engineering of polyurethane coatings for high performance applilncations", Prog. Polym. Sci., 32, 352 (2007). https://doi.org/10.1016/j.progpolymsci.2006.05.003
  2. S. M. Clift, "Understanding the dynamic properties of polyurethane cast elastomers", J. Elastomers and Plastics, 23, 66 (1991). https://doi.org/10.1177/009524439102300105
  3. K. Gisselfält 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, 265 (2003). https://doi.org/10.1002/mame.200390023
  4. X.-D. Chen, N.-Q. Zhou1, 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-thioltoluene diamine", J. Biomedical Sci. Eng., 2, 245 (2009). https://doi.org/10.4236/jbise.2009.24038
  5. C. M. Thompson, S. G. Taylor, and W. W. Mcgee, "Gel permeation chromatographic analysis of polyurethane prepolymer synthesis kinetics. I. The effect of catalyst", J. Polym. Sci. Part A: Polym. Chem., 28, 333 (1990). https://doi.org/10.1002/pola.1990.080280209
  6. S. Parnell, K. Min, and M. Cakmak, "Kinetic studies of polyurethane polymerization with Raman spectroscopy", Polymer, 44, 5137 (2003). https://doi.org/10.1016/S0032-3861(03)00468-3
  7. V. W. A. Verhoeven, A. D. Padsalgikar, K. J. Ganzeveld, L. P. and B. M. Janssen, "A kinetic investigation of polyurethane polymerization for reactive extrusion purposes", J. Appl. Polym. Sci., 101, 370 (2006). https://doi.org/10.1002/app.23848
  8. Y. Cui, L. Hong, X. Wang, and X. Tang, "Evaluation of the cure kinetics of isocyanate reactive hot-melt adhesives with differential scanning calorimetry", Appl. Polym. Sci., 89, 2708 (2003). https://doi.org/10.1002/app.12394
  9. http://www.tainstruments.com/pdf/ literature/TA073.pdf, "A Review of DSC Kinetics Methods", TA Instruments.
  10. D. Rosu, C. N. Cascval, F. Mustata, and C. Ciobanu, "Cure kinetics epoxy resins by non-isothermal DSC data", Thermochim Acta, 383, 119 (2002). https://doi.org/10.1016/S0040-6031(01)00672-4
  11. X. Ramis and J. M. Salla, "Time-temperature transformation (TTT) cure diagram of an unsaturated polyester resin", J. Polym. Sci., Part B: Polym. Phys., 35, 371 (1997).
  12. A. Atarsia and R. Boukhili, "Relationship between isothermal and dynamic cure of thermosets via the isoconversion representation", Polym. Eng. Sci., 40, 607 (2000). https://doi.org/10.1002/pen.11191
  13. M. V. Alonso, M. Oliet, J. Garcia, F. Rodriguez, and J. Echeverria, "Transformation of dynamic DSC results into isothermal data for the curing kinetics study of the resol resins", J. Thermal Anal. Calorim., 26, 797 (2006).
  14. M. R. Kamal and S. Sourour, "Kinetics and thermal characterization of thermoset cure", Polym. Eng. Sci., 13, 59 (1973). https://doi.org/10.1002/pen.760130110
  15. Senum, G. I. and Yang, R. T., "Rational approximations of the integral of the Arrhenius function", J. Thermal Anal., 11, 445 (1977). https://doi.org/10.1007/BF01903696
  16. W. Ahn and S.-H. Eom, "A Study on Reaction Kinetics of PTMG/TDI Prepolymer with MOCA by Non-Isothermal DSC", Elastomers and Composites, 50, 92 (2015). https://doi.org/10.7473/EC.2015.50.2.092