Bulk and Shear Relaxation Processes in Poly-i-butyl Methacrylate

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Copyright (c) 1968 The Japan Society of Applied Physics
, , Citation Eiichi Morita et al 1968 Jpn. J. Appl. Phys. 7 451 DOI 10.1143/JJAP.7.451

1347-4065/7/5/451

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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10.1143/JJAP.7.451