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Pietrzak L, Piorkowska E, Galeski A, Bojda J, Sowinski P. Modification of Syndiotactic Polypropylene with Nano-Calcium Carbonate and Halloysite. INT POLYM PROC 2018. [DOI: 10.3139/217.3521] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Composites of syndiotactic polypropylene (sPP) with 5 to 17 vol.° of halloysite and 2.5 to 7.5 vol.° of stearic acid modified nano-calcium carbonate, having an average grain size of 80 nm, were prepared and examined. The effect of fillers on thermal properties of sPP was different; halloysite increased markedly peak crystallization temperature. The composites with the highest filler contents, 7.5 vol.° of calcium carbonate and 17 vol.° of halloysite, exhibited a solid-like behavior at 170 °C, with the storage modulus exceeding the loss modulus in the entire frequency range, that is 512 to 0.1 rad s−1. The composites with halloysite exhibited decreased Izod impact strength compared to neat sPP. On the contrary, 2.7 fold improvement of the impact strength was found for the composites with nano-calcium carbonate. Moreover, nano-calcium carbonate did not worsen the drawability of the materials during uniaxial drawing. It was found that debonding at calcium carbonate/sPP interface occurred both during the impact test and tensile drawing facilitating the plastic deformation of the polymer.
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Affiliation(s)
- L. Pietrzak
- Centre of Molecular and Macromolecular Studies , Polish Academy of Sciences, Lodz , Poland
| | - E. Piorkowska
- Centre of Molecular and Macromolecular Studies , Polish Academy of Sciences, Lodz , Poland
| | - A. Galeski
- Centre of Molecular and Macromolecular Studies , Polish Academy of Sciences, Lodz , Poland
| | - J. Bojda
- Centre of Molecular and Macromolecular Studies , Polish Academy of Sciences, Lodz , Poland
| | - P. Sowinski
- Centre of Molecular and Macromolecular Studies , Polish Academy of Sciences, Lodz , Poland
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