Abstract
Relaxation of the bulk and shear moduli of poly-i-butyl methacrylate is investigated using the modified rotating plate method. Both shifted factors for bulk and shear moduli follow the WLF equation of poly-n-butyl methacrylate. The reduced function of bulk moduli indicates a relatively narrow distribution of relaxation times compared with that of shear moduli. The average bulk relaxation time is found to be nearly five times as long as the average shear relaxation time.
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