Micromechanics of stress relaxation in amorphous glassy PMMA Part II: application of the RT model
This paper describes computer simulations and experimental results of stress relaxation carried out in polymethyl methacrylate (PMMA). The results are analysed in terms of the RT model proposed earlier. The main theoretical result is that transitions of side-groups, or parts thereof, can account for approximately 10% of stress relaxation. The experimentally observed relaxation strength in a time of approximately 3 h at 50 K below Tg is of the order of 40-60%. These facts provide conclusive...[Show more]
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