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Study of polymer powder and melt rheology using a constant pressure, non‐isothermal rheometer
Author(s) -
Lee BiingLin
Publication year - 1986
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.760261405
Subject(s) - rheometer , materials science , rheology , composite material , polymer , die swell , compaction , viscosity , extrusion
A rheological analysis is proposed on a non‐conventional, constant pressure, non‐isothermal rheometer. The test usually starts with a polymer powder and ends with melt extrudate. The volume‐ (or displacement of plunger) temperature curve of the test is analyzed according to the following model: (1) at a temperature below the glass transition temperature, the test is related to the packing and/or compaction of powders, and also the compressive deformation of powders; (2) as the temperature is raised to where polymer flow begins, the test is analyzed according to melt viscous flow. The activation energy of flow of a polymer may also be estimated using this rheometer. Comparison and correlation of data using other techniques (e.g. torsional pendulum dynamic measurement, capillary rheometer, Rheometric dynamic spectrometer) will also be discussed.