Novel precursors suitable for RIM polyurethane networks

Autor: Richard H. Still, John L. Cawse, John L. Stanford
Rok vydání: 1985
Předmět:
Zdroj: British Polymer Journal. 17:233-238
ISSN: 1934-256X
0007-1641
DOI: 10.1002/pi.4980170227
Popis: The synthesis and development of novel, furan-based diisocyanates (FDI) and myrcene-based polyols (PM) with potential for polyurethane production are presented. Pure FDI compounds, similar in structure to 4,4'-methylenediphenylene diisocyanate (MDI) were prepared unambiguously from fur-furylamine as liquids of low volatility, stable down to 0° C. making them particularly suitable for RIM. Comparative kinetics studies with n-butanol show the FDIs to behave as benzylic compounds with reactivities intermediate between those of aryl and alkyl diisocynates. Studies were made on segmented copolyurethanes prepared from FDI and polyol mixtures of 1,4-butane diol (BD) and polytetrahydrofuran (Mn. 1010). Hydroxyfunctional polymyrcenes were prepared from myrcene in n-butanol at 100° C using hydrogen peroxide as initiator. The liquid rubbers formed (Mn, 2000-4000; with fn, 2.3-1.3 respectively) were shown by n.m.r. to comprise mainly substituted 1,4-butadiene units and are similar to the commercially available polybutadienes (PB). Copolyurethane elastomers were prepared from polyol blends of PM and 1,4-butane diol reacting with MDI. Both series of FDI-and PM-based copolyurethanes were shown by d.s.c. d.m.a. and tensile measurements to possess properties comparable to analogous materials formed from, respectively, MDI- and PB-based systems. In addition to their suitability for RIM, the results show the feasibility of deriving polyurethane feedstocks from naturally-occurring, non-oil based sources.
Databáze: OpenAIRE
Externí odkaz: