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Rheological properties of calcium silicate‐filled isotactic polypropylene
Author(s) -
Maiti S. N.,
Singh Gurunam,
Nordin Ibrahim Mohd.
Publication year - 2002
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.11539
Subject(s) - rheology , materials science , composite material , silicate , tacticity , shear thinning , viscosity , shear rate , calcium silicate , polypropylene , filler (materials) , polymer , chemical engineering , polymerization , engineering
The melt rheological behavior of calcium silicate‐filled isotactic polypropylene, with filler volume contents of 0–17.8%, was determined at 493 K. The composites followed the power law in shear stress versus shear rate variations and were shear thinning. Initially, apparent melt viscosity decreased until a critical filler volume content of 8.5% was reached. However, on further increase in calcium silicate concentration, apparent melt viscosity increased. Melt elasticity also showed an initial decrease until 8.5% filler content was reached and then an increase beyond this filler content. Surface treatment of calcium silicate with a titanate coupling agent, LICA 38, modified the rheological properties because of the plasticizing/lubricating effect of LICA 38. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1511–1518, 2003