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Effect of dispersion of particles on viscoelasticity of CaCo 3 ‐filled polypropylene melts
Author(s) -
Li Lin,
Masuda Toshiro
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.760301407
Subject(s) - viscoelasticity , materials science , rheology , dispersion (optics) , polypropylene , composite material , plateau (mathematics) , particle (ecology) , particle size , polymer , shear (geology) , dynamic modulus , dynamic mechanical analysis , optics , chemical engineering , mathematical analysis , oceanography , physics , mathematics , engineering , geology
Viscoelastic properties of polypropylene melts filled with small (0.15 μm) and large (4.0 μm) CaCO 3 particles have been measured. The effects of particle size, loading, and rheological history on the dispersion of particles have been investigated. The dispersion of particles was found to decisively influence the viscoelastic properties of these filled polymers. The systems filled with large particles exhibit a relatively stable viscoelastic behavior. The small particle‐filled polymers with low loading are stable similarly to the large particle‐filled system. For the system filled with 30 wt% small particles, there appears a “second plateau” in the storage modulus G ′ curve in low frequency region and the height of the second plateau depends strongly on the rheological history. The results are interpreted in terms of the formation of an internal structure of particles. It was found that the internal structure of particles is broken up by a steady shear flow and the dispersion of particles is changed.