Bulk and Shear Relaxation Processes in Poly-i-butyl Methacrylate
- 1 May 1968
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 7 (5), 451-461
- https://doi.org/10.1143/jjap.7.451
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.Keywords
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