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Rabat, Morocco

Qaiss A.,Laval University | Saidi H.,Hassan II Academy of Science and Technology | Saidi H.,University Agdal | Fassi-Fehri O.,Hassan II Academy of Science and Technology | And 2 more authors.
Polymer Engineering and Science

Cellular polypropylene-calcium carbonate based piezoelectric films were obtained using biaxial stretching and gas-mediated inflation followed by a corona discharge treatment using home-made devices. The obtained results revealed a cellular structure that develops at the interface between the solid particles and the polymer matrix and the final piezoelectric coefficient was found to depend both on the gas pressure profile and on time. The inflation step gives better results when the gas pressure is increased in stepwise manner allowing the gas to adequately intrude the cavities and maintain the required pressure. The overall results are discussed in terms of processing conditions and in terms of the developed microstructure. POLYM. ENG. SCI., 2012. © 2012 Society of Plastics Engineers Copyright © 2012 Society of Plastics Engineers. Source

Qaiss A.,Laval University | Qaiss A.,Mohammed V University | Saidi H.,Mohammed V University | Saidi H.,University Agdal | And 6 more authors.
Journal of Applied Polymer Science

Porous polymer films were generated by biaxial stretching of polypropylene (PP) and high-density polyethylene (HDPE) filled with various amounts of calcium carbonate particles. The porosity of the films was measured by mercury porosimetry, and the obtained results were related to the processing conditions and to the morphology development during the biaxial stretching. The results showed that increasing the calcium carbonate (CaCO3) concentration and the draw ratio resulted in porosity increase for PP-based composite films and in a decreased porosity in HDPE-based composite films. Such peculiar behavior was connected to interfacial specific interactions between the matrix and the dispersed particles as well as to the crystallinity of the films. © 2011 Wiley Periodicals, Inc. Source

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