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The Effect of Calcium Carbonate Nanofiller on the Mechanical Properties and Crystallisation Behaviour of Polypropylene

Hanim H., and Zarina R., and Ahmad Fuad M.Y., and Mohd. Ishak Z.A., and Azman Hassan, (2008) The Effect of Calcium Carbonate Nanofiller on the Mechanical Properties and Crystallisation Behaviour of Polypropylene. Malaysian Polymer Journal, 31 (1). pp. 38-49. ISSN 18237789

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Official URL: http://www.fkkksa.utm.my/mpj/images/080301_4han.pdf

Affiliations

SIRIM Berhad. Advanced Materials Research Centre
SIRIM Berhad. Advanced Materials Research Centre
SIRIM Berhad. Advanced Materials Research Centre
Universiti Sains Malaysia. School of Materials and Mineral Resources Engineering
Universiti Teknologi Malaysia. Faculty of Chemical and Natural Resources Engineering

Abstract

Polypropylene/calcium carbonate (PP/NPCC) nanocomposites were prepared using a co-rotating twin screw extruder at filler loadings of 5, 10 and 15 weight%. The impact strength and modulus of PP showed some improvement with the incorporation of the nanofiller while the tensile strength deteriorated. SEM photomicrographs showed evidence of NPCC agglomeration within the PP matrix, indicating that the level of shear stress generated during melt compounding was far from adequate to break-up the nanofiller. WAXD results showed the appearance of β-phase PP in the nanocomposites with 10 and 15 weight % NPCC. The influence of NPCC filler on the crystallisation behaviour of PP were also investigated using a DSC. Incorporation of NPCC shifted the crystallisation exotherms of PP towards higher temperatures, indicating that the nanofiller has acted as a nucleating agent for PP. The reduced values of half crystallisation times also implied that the introduction of NPCC has accelerated the crystallisation rate of PP.

Item Type:Journal
Additional Information:The authors would like to thank the Ministry of Science, Technology and Innovation (MOSTI), Malaysia for the IRPA research grant (project no.03-01-01-0052-EA001). The authors would also like to thank Zalena Saem and Azura Ruhan for their kind assistance in conducting the SEM analysis.
Keywords:polypropylene, nano-sized calcium carbonate, nanocomposites, crystallisation
Subjects:Q Science, Computer Science
T Technology, Engineering
ID Code:6166

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