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International Journal of Polymer Science
Volume 2016, Article ID 7873120, 10 pages
http://dx.doi.org/10.1155/2016/7873120
Research Article

New Evidences on the Process Sensitivity of Some Renewable Blends Based on Starch considering Their Melt Rheological Properties

1National Research and Development Institute for Chemistry and Petrochemisrty ICECHIM, 202 Splaiul Independentei, 060021 Bucharest, Romania
2Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Gheorghe Polizu, 011061 Bucharest, Romania
3Faculty of Mechanical Engineering and Mechatronics, University Politehnica of Bucharest, 313 Spaiul Independentei, 060042 Bucharest, Romania
4Research Institute of Organic Auxiliary Products ICPAO, 8 Carpati, Medias, 551022 Sibiu County, Romania

Received 26 September 2014; Accepted 21 January 2015

Academic Editor: Jean-Marc Saiter

Copyright © 2016 Doina Dimonie et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The degradability and processability of new renewable materials based on starch and PVOH were studied using the melt flow index (MFI) method by measuring the melt rheological properties which depend not only on the extrusion conditions and material formulation but also on the macromolecule characteristics which can be modified by chemical degradation. These results were correlated with other material properties like color and cross-linking degree. The obtained results show that flowing in the melted state of the studied materials is accompanied by a second process of chains chemical degradation. It was observed that, at the same level of additivation, under identical extrusion conditions, the melted blends with corn starch as main component are highly mechanically sensitive and degrade mostly by chains scission and those with PVOH as major component are highly temperature sensitive and degrade mainly by cross-linking. The obtained results show also that each PVOH-starch blend requires particular formulation and individual windows of melt processing conditions. These results are a good proof that the MFI method is a good path to study the degradability and moldability of process sensitive polymeric materials like those based on starch and PVOH.