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8706717 
Journal Article 
Liquid Crystalline Polyurethane Containing Biphenyl Units 
Tanaka, M; Nakaya, T 
1986 
1 
Kobunshi Ronbunshu
ISSN: 0386-2186 
43 
5 
311-314 
English 
Polyurethanes were synthesized by the reaction of 4,4′-di(2-hydroxymethyloxy)biphenyl with diisocyanates such as hexamethylene diisocyanate (HDI), dicyclohexylmethane 4,4′-diisocyanate (H12MDI), cyclohexane 1,3-di(methylisocyanate) (H6XDI), 2,4-tolylene diisocyanate (TDI), and 4,4′-diphenylmethane diisocyanate in DMF for 1.5 hr at 100-140°C in the absence of catalysts. The polyurethanes obtained from HDI, H12MDI, H6XDI and TDI exhibited mesomorphic phase at 188-203°C, 147-172°C, 135-193°C and 151-193°C, respectively. 1986, The Society of Polymer Science, Japan. All rights reserved. 
4,4′-Di(2-hydroxyethyloxy)biphenyl; Diisocyanate; Liquid Crystalline State; Polyurethanes