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Studies on the stress relaxation of polystyrenes in the rubbery‐flow region
Author(s) -
Narkis M.,
Hopkins I. L.,
Tobolsky A. V.
Publication year - 1970
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760100203
Subject(s) - materials science , relaxation (psychology) , molar mass distribution , stress relaxation , modulus , plasticizer , stress (linguistics) , thermodynamics , distribution (mathematics) , polymer , polymer chemistry , composite material , creep , mathematics , psychology , social psychology , mathematical analysis , linguistics , philosophy , physics
Relaxation modulus curves for narrow distribution and broad distribution polystyrenes are compared and the significant effect of molecular weight distribution on these curves is shown. An empirical three‐parameter equation is shown to describe the stress relaxation behavior of narrow distribution polystyrenes. New data for high molecular weight, narrow distribution polystyrenes are presented and used to extend the applicability of previous quantitative relations for higher molecular weights. The stress relaxation technique is shown to be sensitive to the type of plasticizer used at low concentrations.