Industrial application of molecular computations on the dimerization of methylene diphenyl diisocyanate

R. Zsanett Boros, Anita Rágyanszki, I. Csizmadia, Béla Fiser, Andrea Guljas, László Farkas, B. Viskolcz

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In the polyurethane industry, the undesirable dimerization and oligomerization of methylene diphenyl diisocyanate (MDI) are unwanted and problematic phenomena. The relative ratios of these dimers and oligomers have a strong temperature dependence, and they can be formed below and above the melting point of MDI (316.15 K). All possible structures of the isomers and their dimers were optimized, and then their thermodynamic functions were calculated at the M06-2X/6-31(d,p) level of theory. The dimerization of isocyanate groups can result in four-, five-, and six-membered rings. The four-membered ring is the most stable one due to the aromatic electrons in π orbitals of the uretidione ring. The relative stability of the dimers is therefore influenced by the steric effects and the relative positions of isocyanate groups. The most stable dimer is the one which is formed from the reaction of the p,o- and o,p-MDI isomers due to their intrinsic interactions, which were classified, and their impact on dimer stability was discussed.

Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalReaction Kinetics, Mechanisms and Catalysis
DOIs
Publication statusAccepted/In press - Mar 7 2018

Fingerprint

diisocyanates
Dimerization
dimerization
methylene
Dimers
Industrial applications
dimers
Isocyanates
isocyanates
Isomers
rings
isomers
Oligomerization
Polyurethanes
oligomers
Oligomers
melting points
Melting point
industries
4,4'-diphenylmethane diisocyanate

Keywords

  • Dimerization
  • Isocyanates
  • Methylene diphenyl diisocyanate
  • Quantum chemical calculations

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Cite this

Industrial application of molecular computations on the dimerization of methylene diphenyl diisocyanate. / Boros, R. Zsanett; Rágyanszki, Anita; Csizmadia, I.; Fiser, Béla; Guljas, Andrea; Farkas, László; Viskolcz, B.

In: Reaction Kinetics, Mechanisms and Catalysis, 07.03.2018, p. 1-14.

Research output: Contribution to journalArticle

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