Relaxation Dynamics in Polyethylene Glycol/Modified Hydrotalcite Nanocomposites
Please use this identifier to cite or link to this item:
http://hdl.handle.net/10347/22327
Files in this item
Metadata
Title: | Relaxation Dynamics in Polyethylene Glycol/Modified Hydrotalcite Nanocomposites |
Author: | Arrigo, Rossella Antonioli, Diego Lazzari, Massimo Gianotti, Valentina Laus, Michele Montanaro, Laura Malucelli, Giulio |
Affiliation: | Universidade de Santiago de Compostela. Centro de Investigación en Química Biolóxica e Materiais Moleculares Universidade de Santiago de Compostela. Departamento de Química Física |
Subject: | Rheological behavior | Polyethylene glycol | Organo-modified hydrotalcite | Grafting reactions | Annealing | |
Date of Issue: | 2018 |
Publisher: | MDPI |
Citation: | Arrigo, R.; Antonioli, D.; Lazzari, M.; Gianotti, V.; Laus, M.; Montanaro, L.; Malucelli, G. Relaxation Dynamics in Polyethylene Glycol/Modified Hydrotalcite Nanocomposites. Polymers 2018, 10, 1182 |
Abstract: | Polyethylene glycol-based nanocomposites containing an organo-modified hydrotalcite with loadings ranging from 0.5 to 5 wt.% were prepared by melt mixing performed just above the melting point of the polymer matrix. In these conditions, the dispersion of the nanofiller within the polymer matrix was quite homogeneous as revealed by TEM analyses. The effect of various thermal treatments and filler loadings was thoroughly investigated by means of rheological, morphological and gas chromatography-mass spectrometry, hyphenated to thermogravimetry analysis tests. Unfilled polyethylene glycol exhibited a continuous decrease in complex viscosity upon heating. In contrast, the complex viscosity of nanocomposites containing nanofiller loadings higher than 1 wt.% showed first a decrease, followed by an increase in the complex viscosity as the temperature increases, exhibiting a minimum between 130 and 140 °C. Annealing at 180 °C for different times further increased the viscosity of the system. This unusual behavior was explained by the occurrence of grafting reactions between the –OH terminal groups of the polyethylene glycol chains and the hydroxyl groups of the organo-modified filler, thus remarkably affecting the relaxation dynamics of the system |
Publisher version: | https://doi.org/10.3390/polym10111182 |
URI: | http://hdl.handle.net/10347/22327 |
DOI: | 10.3390/polym10111182 |
E-ISSN: | 2073-4360 |
Rights: | © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/) |
Collections
-
- CIQUS-Artigos [391]
- QF-Artigos [107]
Except where otherwise noted, this item's license is described as © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)