New thermal study of polymerization and degradation kinetics of methylene diphenyl diisocyanate
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This work investigates the thermal polymerization process of a methylene diphenyl diisocyanate (MDI) monomer as well as its thermal degradation following the ICTAC recommendations. MDI monomer is widely used as a synthetic resin in the production of MDF panels, as it provides compaction of the eucalyptus fibers by polymerization. Thermogravimetry/derivative thermogravimetric-differential thermal analysis (TG/DTG-DTA), differential scanning calorimetry, and mid-infrared spectroscopy were used in this study. The polymerization process (An) and degradation (Fn) process exhibited activation energy equal to 149.70 and 80.22 kJ mol−1, respectively. The combined the FTIR and kinetic information makes it possible to suggest the mechanism reaction, which is an inedited data in literature.
KeywordsPolymerization Degradation Methylene diphenyl diisocyanate Non-isothermal kinetics Thermal studies
The authors wish to thank CAPES (proc. 024/2012 Pro-equipment), POSMAT/UNESP) and FAPESP (processes: 2013/09022-7 and 2017/08820-8), CNPq (Processes 302267/2015-8 and 302753/2015-0) for financial support, as well as Netzsch-Brazil for providing kinetic computational program (Netzsch kinetics Neo Trial).
- 1.Product Safety Assessment. DOW Modified Methyl Diphenyl Diisocyanate (MDI) Products 2015;1–8.Google Scholar
- 11.Zhang Q, Li H, Liu H. Study on polymerization kinetics of methylene diphenyl diisocyanate. Acta Chim Sinica. 2011;69:605–9.Google Scholar
- 12.Zhang J, Tang Y, Liu J, Chen Y. Thermal stability and thermal degradation reaction kinetics of 4,4′-Diphenylmethane diisocyanatetrimer. Asian J Chem. 2014;26:1527–9.Google Scholar
- 14.Netzsch—Thermokinetics. https://kinetics.netzsch.com/en/. Acessed 09 Sep 2017.
- 16.American Society for Testing and Materials—ASTM. ASTM-E1356: Standard test method for assignment of the glass transition temperatures by differential scanning calorimetry. West Conshohocken: ASTM; 2014.Google Scholar
- 19.Moukhina E. Determination of kinetic mechanisms for reactions measured with thermoanalytical instruments. J Therm Anal Calorim. 2012;109(1203–121):4.Google Scholar
- 20.Friedman HL. Kinetics of thermal degradation of char-forming plastics from thermogravimetry. Application to a phenolic plastic. J Polym Sci. 1964; 183–195.Google Scholar
- 23.Miller JN, Miller JC. Statistics and chemometrics for analytical chemistry. 6th ed. Harlow: Pearson Education Limited; 2010.Google Scholar
- 27.American Society for Testing and Materials—ASTM. ASTM-E1641: Standard test method for decomposition kinetics by thermogravimetry. West Conshohocken: ASTM; 1999.Google Scholar
- 28.American Society for Testing and Materials—ASTM. ASTM-E1877: Standard practice for calculating thermal endurance of materials from thermogravimetric decomposition data. West Conshohocken: ASTM; 1999.Google Scholar
- 29.National Institute of Standards and Technology—NIST. IR Spectrum methylene diphenyl diisocyanate. Webbook NIST; 2009.Google Scholar
- 30.Silverstein RM, Webster FX, Kiemle DJ, editors. Spectrometric Identification of organic compounds. 7th ed. Wiley, 2005.Google Scholar
- 33.Brown TE, LeMay HE, Bursten BE. Murphy C, Woodward P.Chemistry: the central science. 9th ed. Boston: Pearson, 2005.Google Scholar