Macromolecular Research

, Volume 13, Issue 5, pp 427–434 | Cite as

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

  • Jung Min Lee
  • Sankaraiah Subramani
  • Young Soo Lee
  • Jung Hyun Kim


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.


blocked isocyanate blocking agent deblocking behavior adducts dissociation 


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Copyright information

© The Polymer Society of Korea and Springer 2005

Authors and Affiliations

  • Jung Min Lee
    • 1
  • Sankaraiah Subramani
    • 1
  • Young Soo Lee
    • 1
  • Jung Hyun Kim
    • 1
  1. 1.Nanosphere Process and Technology Laboratory, Department of Chemical EngineeringYonsei UniversitySeoulKorea

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