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The viscoelastic properties of PP/glass fiber composites in molten state
Author(s) -
Chiu WenYen,
Hsueh TzungCheng
Publication year - 1986
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1986.070320431
Subject(s) - materials science , composite material , viscoelasticity , rheometer , polypropylene , glass fiber , dynamic mechanical analysis , fiber , rheology , viscosity , dynamic modulus , die swell , shear rate , polymer , extrusion
The molten viscoelastic behavior of polypropylene/glass fiber composites (FRPP) were investigated under steady state and dynamic state. The steady viscosity was measured from both cone‐plate rheometer and capillary flow tester. The dynamic viscoelastic properties were measured from cone‐plate rheometer. The variation of molten viscoelastic behavior of FRPP with the composition, temperature, shear rate, and coupling agent are examined and discussed in this paper. Die swell phenomena of FRPP at different temperatures, shear rates, and compositions were also observed. The results were that the viscosity and modulus of FRPP increased with increasing the fiber content in FRPP. Pretreatment of glass fibers with coupling agent would enhance the interfacial adhesion between polypropylene and fibers, and the fiber length in FRPP was longer on the average. Die swell of FRPP significantly decreased by the presence of glass fibers.