Modification of polypropylene films for antistatic and anti-scratch properties

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2007
Kürkçü, Pınar
Polypropylene films are widely used in industry, especially for packaging purposes. However, these films become statically charged when they are subject to friction. The accumulation of charges in some applications can be harmful, especially for the electronic devices and can cause undesirable appearance due to the attraction of dusts. Furthermore, minimum susceptibility to mechanically induced surface damage is a desired property since scratches reduce the mechanical strength and the bright texture of the film in packaging of commercial items and limit the applications of the material. This study aims to provide antistatic character to polypropylene films by the utilization of conductive fillers which function independent of humidity and enhance their scratch resistance by means of aromatic based additives. Polypyrrole-polypropylene composites including 2%, 5%, 7% and 9% pyrrole were synthesized by chemical modification. 2% of pyrrole was adequate to provide antistatic character to the films. Moreover, they attained conductive property when the pyrrole content exceeds 7%. Polypropylene based materials containing four different compositions of 1,7-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, pphenylene diamine and hydroquinone were prepared by mechanical mixing. Scratch resistance of polypropylene films increased significantly with the insertion of additives. The material containing 2% 1,7-dihydroxynaphthalene introduced the highest enhancement by more than 60%. Moreover, mechanical analysis results showed that insertion of the additives except hydroquinone increased Young’s modulus of the polypropylene films. In addition, tensile strength and elongation at break of polypropylene films were enhanced significantly with insertion of the additives regardless of the additive type.

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Citation Formats
P. Kürkçü, “Modification of polypropylene films for antistatic and anti-scratch properties,” M.S. - Master of Science, Middle East Technical University, 2007.