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Extrudate swelling and viscoelasticity of rigid PVC compounds
Author(s) -
Huneault Michael A.,
Carreau Pierre J.,
Lafleur Pierre G.,
Gupta Ved P.
Publication year - 1992
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730140403
Subject(s) - die swell , viscoelasticity , rheometry , swelling , materials science , creep , composite material , elasticity (physics) , relaxation (psychology) , extrusion , psychology , social psychology
In this paper, we investigate the effects of processing aids, impact modifiers, inorganic fillers, and resin molecular weight on the postextrusion swelling of rigid PVC compounds. Rotational rheometry measurements of the loss tangent in dynamic mode and of the recoverable shear in creep mode are made to evaluate PVC's elasticity. Long elastic relaxation times are found for rigid PVC. This apparent contradiction, i.e., relatively low swell but very high elastic relaxation time, is explained by taking into account the two‐phase flow behavior of PVC.