Studies on the effect of extraction of isophorone diisocyanate-based segmented polyurethanes |
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| Authors: | N Shunmuga Kumar and M Jayabalan |
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| Institution: | (1) Sree Chitra Tirunal Institute for Medical Sciences and Technology, Division for Technical Evaluation of Biomaterials, BMT Wing, 695 012 Trivandrum, India |
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| Abstract: | Linear segmented polyurethane was synthesised, using isophorone diisocyanate (IPDI), poly(tetramethylene oxide) glycol (PTMG)
and 1,4 butanediol, for use in biomedical applications. The chemical stability of this polyurethane in hot methanol during
Soxhlet extraction was studied by viscosity measurements, thermal studies, mechanical tests, ultraviolet and infrared spectral
studies, and gel permeation chromatography. Hot methanol degrades the polymer at the allophanate linkages, while extracting
low molecular weight polyurethane fractions. More urea linkages are formed in the extracted polymer. |
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| Keywords: | Polyurethane isophorone diisocyanate extraction degradation allophanate linkage |
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