Reprocessing effects on polypropylene/silica nanocomposites
Article first published online: 17 DEC 2013
Copyright © 2013 Wiley Periodicals, Inc.
Journal of Applied Polymer Science
Volume 131, Issue 10, May 15, 2014
How to Cite
2014). Reprocessing effects on polypropylene/silica nanocomposites. J. Appl. Polym. Sci. 131, 40242, doi: 10.1002/app.40242and (
- Issue published online: 14 FEB 2014
- Article first published online: 17 DEC 2013
- Manuscript Accepted: 1 DEC 2013
- Manuscript Received: 30 SEP 2013
- nanowires and nanocrystals;
- thermal properties;
- mechanical properties
A polypropylene matrix was melt compounded with a given amount (2 vol %) of both untreated (hydrophilic) and surface treated (hydrophobic) fumed silica nanoparticles with the aim to investigate the influence of the time under processing conditions on the microstructure and thermo-mechanical properties of the resulting materials. Chain scission reactions induced by thermal processing caused a remarkable decrease of the melt viscosity, as revealed by the melt flow index values of both neat matrix and nanocomposites, but the degradative effect was significantly hindered by the presence of silica nanoparticles. It was observed that the size of nanofiller aggregates noticeably decreased as the compounding time increased, especially when hydrophobic silica nanofiller was considered. While the melting temperature seemed to be unaffected by the processing time, a remarkable embrittlement of the samples was observed for prolonged compounding times. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40242.