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Modification of Syndiotactic Polypropylene with Nano-Calcium Carbonate and Halloysite
- Source :
- International Polymer Processing. 33:314-321
- Publication Year :
- 2018
- Publisher :
- Walter de Gruyter GmbH, 2018.
-
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.
- Subjects :
- Polypropylene
Materials science
Polymers and Plastics
General Chemical Engineering
02 engineering and technology
engineering.material
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Halloysite
Industrial and Manufacturing Engineering
Grain size
0104 chemical sciences
chemistry.chemical_compound
Calcium carbonate
chemistry
Chemical engineering
Tacticity
Nano
Materials Chemistry
engineering
Carbonate
Stearic acid
0210 nano-technology
Subjects
Details
- ISSN :
- 21958602 and 0930777X
- Volume :
- 33
- Database :
- OpenAIRE
- Journal :
- International Polymer Processing
- Accession number :
- edsair.doi...........c22d0088b2d90fa540d0cb97b4e75439