SYNTHESIS OF α,ω–DI(HYDROXY)POLYISOBUTYLENE AS MACRODIOL FOR THE PREPARATION OF POLYURETHANES
The aim of this study is to develop a synthesis method for PUs based on macrodiols with excellent hydrolytic/oxidative stability. We started our investigations with a commercially available polycarbonate (PC) because it has a relatively good resistance to hydrolysis.2 In order to increase the biostability a small amount of polydimethylsiloxane (PDMS)3 was added as comacrodiol. As the polyisobutylene (PIB) moiety exhibits hydrolytic and oxidative stability4, it is to be expected that PUs based on PIB should have the same properties. Because a PIB-macrodiol is not commercially available, it seemed appropriate to perform the synthesis in our laboratory.
- 8 PC-PUs were synthesized and characterized.
- exo-terminated PIB was synthesized using H2O/AlCl3.nBu2O/DiCumOH as initiating system.
- two strategies for the synthesis of HO-PIB-OH were successfully developed.
- PIB-PU has a good reactivity towards H12MDI.
/ M. A. Maurus, L. Kitaeva, C. Liu, T. Maier, W. Schramm, G. Lorenz /