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Polymers 2018, 10(11), 1182; https://doi.org/10.3390/polym10111182

Relaxation Dynamics in Polyethylene Glycol/Modified Hydrotalcite Nanocomposites

1
Department of Applied Science and Technology and Local INSTM Unit, Politecnico di Torino, Viale T. Michel 5, 15121 Alessandria, Italy
2
Department of Science and Technological Innovation, Università del Piemonte Orientale “A. Avogadro”, Viale T. Michel 11, 15121 Alessandria, Italy
3
Departamento de Química Física, Facultade de Química, and Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
4
Department of Applied Science and Technology and Local INSTM Unit, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy
*
Author to whom correspondence should be addressed.
Received: 24 September 2018 / Revised: 16 October 2018 / Accepted: 20 October 2018 / Published: 24 October 2018
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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. View Full-Text
Keywords: rheological behavior; polyethylene glycol; organo-modified hydrotalcite; grafting reactions; annealing rheological behavior; polyethylene glycol; organo-modified hydrotalcite; grafting reactions; annealing
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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 (CC BY 4.0).
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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.

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