Mechanical properties of i-PP/CaCO3 composites
Article first published online: 10 MAR 2003
Copyright © 1991 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 42, Issue 12, pages 3101–3110, 20 June 1991
How to Cite
Maiti, S. N. and Mahapatro, P. K. (1991), Mechanical properties of i-PP/CaCO3 composites. J. Appl. Polym. Sci., 42: 3101–3110. doi: 10.1002/app.1991.070421204
- Issue published online: 10 MAR 2003
- Article first published online: 10 MAR 2003
- Manuscript Accepted: 12 OCT 1990
- Manuscript Received: 6 MAR 1990
Tensile and impact behavior of CaCO3-filled polypropylene was studied in the composition range 0–60 wt % filler. Tensile modulus increased while tensile strength and breaking elongation decreased with increase in CaCO3 content. The modulus increase and elongation decrease were attributed to increased filler–polymer interaction resulting in reduction in molecular mobility, while increased amorphization and obstruction to stress transfer accounted for the tensile strength decrease. Analysis of tensile strength data showed introduction of stress concentration in the composites. Izod impact strength at first increased up to a critical CaCO3 content, beyond which the value decreased. Surface treatment of CaCO3 with a titanate coupling agent LICA 12 enhances the adhesion of the filler and polymer, which further modifies the strength properties. Scanning electron microscopic studies indicated better dispersion of CaCO3 particles upon surface treatment, which effected the changes in the strength properties of the composites.