It's certainly possible with PP with the right grade if designed correctly in a correctly designed mould and if moulded correctly. Note there are a few ifs in there. I am presuming PSU is polysulphone. I was not aware its molecule was linear enough to draw down to bring the molecules parallel enough to be all perpendicular enough to the axis of the hinge.
Regards
Pat
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PSU is Polysulfone and is used in medical equipment. I am making a bachelor project for a medical device where i need to make this living hinge. this material is unchangeable. i just need some guidelines to confirm if this material is application for making a hinge.
I don't think polysulfone would make a very good living hinge. It has a high modulus, and coupled with very low elongation properties, likely to snap on the first cycle.