Affiliation:
1. Department of Polymer Science, University of Madras, Guindy Campus, Chennai-600025, India
Abstract
Phenol blocked hexamethylenediisocyanate adducts and polyisocyanates were synthesized and their
structure was validated by FTIR, 1H & 13C NMR spectroscopy, TGA, DSC and CO2 evolution techniques
were used to evaluate the deblocking temperature of blocked isocyanates. Gel time studies of blocked
isocyanates with terathane polyol and solubility study of blocked isocyanates with different polyols
were conducted to demonstrate the structure-property correlation. Epoxy-polyurethane films were
produced utilizing the blocked isocyanates reported in this work with epoxy resin and their structure
was verified by ATR Spectroscopy. TGA, DSC, shore A hardness, tensile strength and flexural strength
analysis were used to investigate the thermal and mechanical characteristics of these films. The findings
of deblocking temperature and gel time revealed that unsubstituted phenol blocked isocyanates and
polyisocyanates deblock at lower temperatures and cure for a shorter time period than substituted
phenol blocked isocyanates. Thermal and mechanical characteristics of epoxy-polyurethane films based
on blocked polyisocyanates are satisfactory.
Publisher
Asian Journal of Chemistry
Cited by
4 articles.
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