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Rheology‐morphology relationships in nylon 6/liquid‐crystalline polymer blends
Author(s) -
La Mantia F. P.,
Valenza A.,
Paci M.,
Magagnini P. L.
Publication year - 1990
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.760300103
Subject(s) - materials science , rheology , capillary action , extrusion , composite material , shear rate , shear (geology) , shear flow , polymer , phase (matter) , fibril , viscosity , nylon 6 , chemical engineering , thermodynamics , organic chemistry , chemistry , physics , genetics , biology , engineering
Extrusion measurements have been carried out on blends of nylon 6 and a liquid‐crystalline copolyesteramide (LCP). The flow curves at low temperature show a behavior similar to that of pure LCP with a rapid rise of the viscosity at low shear rates. At high shear rates the viscosity is lower than that for each of the two components. This minimum has been attributed to the lack of interactions between the two phases and to the formation of fibrils of the LCP phase. The SEM analysis shows, indeed, that fibrils of the LCP phase are produced in the convergent flow at the inlet of the capillary at high shear rates. These fibrils are lost during the flow in the long capillary.