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Correlation of normal stresses in polystyrene melts and its implications
Author(s) -
Oda Kunio,
White James L,
Clark Edward S.
Publication year - 1978
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.760180105
Subject(s) - polystyrene , materials science , rheology , molar mass distribution , shear stress , stress (linguistics) , thermodynamics , shear (geology) , correlation , composite material , polymer chemistry , polymer , mathematics , physics , philosophy , linguistics , geometry
It is found that the principal normal stress difference, N 1 , in commercial polystyrene melts is a unique function of shear stress σ 12 , independent of temperature and molecular weight, An empirical expression representing this relationship is developed. The functional dependence reported does not represent data for narrow molecular weight distribution polystyrenes, generally significantly overpredicting N 1 values. The basis for this behavior is discussed. The implications of the N 1 − σ 12 relationship to some rheological and processing problems are described.