Blocking and Deblocking of Diisocyanate to Synthesize Polyurethanes

Diisocyanates, particularly toluene diisocyanate (TDI), are useful for the preparation of various polyurethanes with specific applications as leather-like materials, adhesives and insoles, etc. Blocking agents can be used for the operational simplicity and to reduce the hazards of TDI. In this paper...

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Published in:Polymers 2021-08, Vol.13 (17), p.2875
Main Authors: Jana, Sourita, Samanta, Debasis, Fahad, Mir Muhammad, Jaisankar, Sellamuthu N., Kim, Hongdoo
Format: Article
Language:English
Subjects:
Adducts
Blocking
Contact angle
Differential scanning calorimetry
Heat measurement
Infrared analysis
Infrared spectroscopy
Insoles
Leather
NMR spectroscopy
Phenols
Polyethylene glycol
Polyols
Polyurethane
Pyrazole
Regeneration
Solvents
Temperature
Thermogravimetric analysis
Toluene
Toluene diisocyanates
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cited_by cdi_FETCH-LOGICAL-c322t-21978b11256d0d35866d5249830611208a63e6e3717746faddb61837960e44bf3
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container_end_page
container_issue 17
container_start_page 2875
container_title Polymers
container_volume 13
creator Jana, Sourita
Samanta, Debasis
Fahad, Mir Muhammad
Jaisankar, Sellamuthu N.
Kim, Hongdoo
description Diisocyanates, particularly toluene diisocyanate (TDI), are useful for the preparation of various polyurethanes with specific applications as leather-like materials, adhesives and insoles, etc. Blocking agents can be used for the operational simplicity and to reduce the hazards of TDI. In this paper, we reported the use of 3-(4-bromo-phenyl)-1H-pyrazole to block toluene diisocyanate (TDI). FTIR, NMR, thermogravimetric analysis, contact angle analysis and differential scanning calorimetry (DSC) were used for the characterization. The effectiveness of the blocking was confirmed by spectroscopic techniques. The DSC thermogram showed that blocked adducts deblock at 240 °C, causing the regeneration of TDI, and causing the diisocyanates to react with polyols of different molecular weights, forming polyurethanes. The characterization of the polyurethanes was performed by infrared spectroscopy, nuclear magnetic resonance spectroscopy, thermogravimetric analysis, differential scanning calorimetry and a contact angle study.
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subjects Adducts
Blocking
Contact angle
Differential scanning calorimetry
Heat measurement
Infrared analysis
Infrared spectroscopy
Insoles
Leather
NMR spectroscopy
Phenols
Polyethylene glycol
Polyols
Polyurethane
Pyrazole
Regeneration
Solvents
Temperature
Thermogravimetric analysis
Toluene
Toluene diisocyanates
title Blocking and Deblocking of Diisocyanate to Synthesize Polyurethanes
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