Thermal decomposition behavior of blocked diisocyanates derived from mixture of blocking agents

Min Lee Jung, Sankaraiah Subramani, Soo Lee Young, Jung-Hyun Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

To improve the performance and reduce raw material costs, blocked isocyanates were prepared with mixture of blocking agents in many industries. Three blocked isocyanates (adducts) namely ε-caprolactam/benzotriazole- blocked 4,4′-diphenylmethane diisocyanate (MDI), toluene-2,4-diisocyanate (TDI) and 4,4′-dicyclohexylmethane diisocyanate (H12MDI) were synthesized. Six reference adducts were also prepared by blocking MDI, TDI, and H12MDI with ε-caprolactam (ε-CL) or benzotriazole. The reactions were carried out in acetone medium and dibutyltin dilaurate (DBTDL) was used as a catalyst. The progress of the blocking reaction was monitored by IR spectroscopy. De-blocking temperatures (dissociation temperatures) of these adducts were studied using DSC and TGA and the results were correlated. As expected, the thermal analysis data showed that de-blocking temperature of blocked aromatic isocyanates was lower than that of the blocked aliphatic isocyanates. The low de-blocking temperature of blocked aromatic isocyanate could be due to electron withdrawing benzene ring present in the blocked isocyanates. It was also found that benzotriazole-blocked adducts de-blocked at higher temperature compared with ε-CL-blocked adducts.

Original languageEnglish
Pages (from-to)427-434
Number of pages8
JournalMacromolecular Research
Volume13
Issue number5
Publication statusPublished - 2005 Oct 1

Fingerprint

Isocyanates
Pyrolysis
Caprolactam
Toluene 2,4-Diisocyanate
Toluene
Temperature
Acetone
Thermoanalysis
Infrared spectroscopy
Benzene
Raw materials
Catalysts
Electrons
Costs
Industry
benzotriazole

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Jung, Min Lee ; Subramani, Sankaraiah ; Young, Soo Lee ; Kim, Jung-Hyun. / Thermal decomposition behavior of blocked diisocyanates derived from mixture of blocking agents. In: Macromolecular Research. 2005 ; Vol. 13, No. 5. pp. 427-434.
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Thermal decomposition behavior of blocked diisocyanates derived from mixture of blocking agents. / Jung, Min Lee; Subramani, Sankaraiah; Young, Soo Lee; Kim, Jung-Hyun.

In: Macromolecular Research, Vol. 13, No. 5, 01.10.2005, p. 427-434.

Research output: Contribution to journalArticle

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