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4903699 
Journal Article 
Effect of H12MDI isomer composition on mechanical and physico-chemical properties of polyurethanes based on amorphous and semicrystalline soft segments 
Saralegi, A; Etxeberria, A; Fernandez-D'Arlas, B; Mondragon, I; Eceiza, A; Angeles Corcuera, M 
2013 
1 
Polymer Bulletin
ISSN: 0170-0839
EISSN: 1436-2449 
70 
8 
2193-2210 
WOS:000321921800004 
Two series of segmented thermoplastic polyurethanes were synthesized having 33 wt % hard segment based on 4,4'-dicyclohexyl methane diisocyanate with different trans-trans isomer contents and 1,3-propanediol chain extender. The soft segments were based on poly(hexamethylene-pentamethylene carbonate)diol and poly(butylene sebacate)diol, amorphous and semicrystalline polyol, respectively. 4,4'-Dicyclohexyl methane diisocyanate with different trans-trans isomer contents were obtained by fractional crystallization of commercial diisocyanate and were characterized by differential scanning calorimetry and nuclear magnetic resonance spectroscopy. 4,4'-Dicyclohexyl methane diisocyanate trans-trans isomer lead to some interesting properties in the synthesized polyurethanes, due to the more ordered hard domains formed by packing of trans-trans 4,4'-dicyclohexyl methane diisocyanate. Thereby, as 4,4'-dicyclohexyl methane diisocyanate trans-trans isomer content increased, a better phase separated structure was observed. 
Biocompatible polymer; 4,4 '-Dicyclohexyl methane diisocyanate; Crystallinity; Geometrical isomer; Phase separation