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Effect of polymer matrix on the rheology of hydroxyapatite‐filled polyethylene composites
Author(s) -
Joseph R.,
McGregor W. J.,
Martyn M. T.,
Tanner K. E.,
Coates P. D.,
Bonfield W.
Publication year - 2002
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.10951
Subject(s) - materials science , high density polyethylene , composite material , shear thinning , rheology , composite number , polyethylene , polymer , shear rate , melt flow index , shear (geology) , copolymer
The effect of matrix polymer and filler content on the rheological behavior of hydroxyapatite‐filled injection molding grade high‐density polyethylene (HDPE) has been studied. Studies of the flow curves revealed that the matrix and the composite exhibit three distinct regions in the flow curve, namely, a pseudoplastic region at low to moderate shear rates, a plateau and a second pseudoplastic region at high shear rates. The shear stress corresponding to the plateau (τ c ) is dependent on both the filler concentration and the melt temperature. Addition of HA in the HDPE matrix increases the value of τ c and decreases compressibility of the melt. An increase in temperature also raises the value of τ c . From the nature of flow curves it is concluded that the matrix polymer largely decides the rheology of the composite.