The image is taken From Callister's Materials Science and Engineering.
After glass transition, the polymer chains are mostly free to rotate and wiggle, but cannot slide past each other until close to melting point. So, with temperature, why there is no continuous decrement of viscoelastic modulus (for a fixed applied strain, after same time)? Is this because the chain "freeing for movement" and "fleeing for sliding past" are kinetically activated sharply beyond a certain temperature (say, Arrhenius kinetics), and in the plateau zone the glass-transition related chain "free to movement" activation is virtually close to 100% while melting related "free to slide past" activation is virtually zero?
Amorphous polystyrene does not have a melting temperature. Only what is (semi-)crystalline can melt. As I understand it, the graph would only make sense if it were semi-crystalline polystyrene... am I missing something?
Hi Sumit,
the short answer to your question is yes I‘d think so. Obviously it’s material dependent as Martin mentioned and won’t occur similarly for every sample type.
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