Segmented polyester polyurethanes have been studied by Cooper and coworkers.23,24 Similarly, creation
of chemical bonds between elastomer and UPR, using methacrylate end-capped carboxy terminated nitrile
rubber25 or isocyanate end-capped polybutadiene26 or
epoxy terminated nitrile rubber,27 has also been explored.
The mechanical properties of resins and laminates
are improved by this technique