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Composites of high density polyethylene and different grades of calcium carbonate: Mechanical, rheological, thermal, and morphological properties
Author(s) -
Teixeira Sylvia C. S.,
M. Moreira Maria,
Lima Aline P.,
Santos Luciene S.,
da Rocha Bianca M.,
de Lima Edson S.,
da Costa Raphael A. A. F.,
da Silva Ana Lúcia N.,
Rocha Marisa C. G.,
Coutinho Fernanda M. B.
Publication year - 2006
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.23920
Subject(s) - high density polyethylene , materials science , composite material , rheology , crystallinity , calcium carbonate , polyethylene , composite number , agglomerate , rheometry , toughness , scanning electron microscope , extrusion , filler (materials) , izod impact strength test , ultimate tensile strength
Calcium carbonate (CaCO 3 )/high density polyethylene (HDPE) composites were prepared in a HAAKE twin screw extruder, using the experimental conditions defined by the factorial experimental design presented in a prior study. In this study, the effect of different grades (Ca 1 and Ca 2 ) and CaCO 3 content (varying from 0 to 15 wt %) on the mechanical, rheological, thermal, and morphological properties was evaluated. The results showed that the addition of the filler provoked a decrease on the impact strength, stress at break, and yield stress properties in relation to the pure HDPE. A consequent increase on the modulus of elasticity, indicating an increase on the rigidity of the composite, was observed. It was also verified a tendency to increase the toughness and the viscosity of the composites as CaCO 3 was added. Scanning electron micrographs showed that as the filler was incorporated to HDPE matrix, CaCO 3 particles tended to agglomerate, especially that grade constituted of particles of smaller size. The thermal analysis showed that the addition of mineral filler caused a decrease on the crystallinity degree. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 2559–2564, 2006