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TG/FTIR/MS study on the influence of nanoparticles content upon the thermal decomposition of starch/poly(vinyl alcohol) montmorillonite nanocomposites

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Abstract

The effect of the nanoclay content on the thermal decomposition of nanocomposites based on poly(vinyl alcohol)/thermoplastic starch, as intercalated hybrids, has been established. The changes in the decomposition products distribution and their evolution have been investigated by coupled thermogravimetric analysis, Fourier transform infrared spectroscopy, and mass spectrometry. Detailed analysis of the in situ vapor phase showed that the poly(vinyl alcohol)/starch/clay nanocomposites display a completely different distribution pattern of degradation product, depending on nanoclay content. By in situ vapor phase FTIR and MS spectroscopic techniques, both decomposition compounds of the constituent polymers and some new ones, depending on the nanoparticles content, are identified. The effect of the increase in nanoparticles content consists mainly in variation of some volatile compounds evolution, such as formic acid, water, formaldehyde, propionic acid, methanol, acetic acid carbon dioxide, benzene, etc., which in the case of nanocomposites is very complex. Thus, a content of 2–4 wt% organically-modified montmorillonite hinders the decomposition of the poly(vinyl alcohol)/starch blend. Both characteristic temperature of evolution of the main compounds increases by increasing its content and evolution starting time is delayed; while the untreated nanoclay acts like a catalyst, which decreases characteristic temperatures and evolution time with increasing its content. The temperature dependence of the maximum evolution rate of various compounds on the nanoclay content is very complex as, in the case of nanocomposites, of both primary and secondary reactions and transport phenomena occur simultaneously. Generally, this behavior is related to the dispersion of nanoclays in the polymeric matrix.

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Acknowledgments

Manuela-Tatiana Nistor thanks the financial support to Romanian National Authority for Scientific Research, CNCS–UEFISCDI, through PN-II-ID-PCE-2011-3-0187 project.

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  1. Department of Physical Chemistry of Polymers, “Petru Poni” Institute of Macromolecular Chemistry, 700487, Iasi, Romania

    Manuela-Tatiana Nistor & Cornelia Vasile

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  1. Manuela-Tatiana Nistor
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  2. Cornelia Vasile
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Correspondence to Cornelia Vasile.

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Nistor, MT., Vasile, C. TG/FTIR/MS study on the influence of nanoparticles content upon the thermal decomposition of starch/poly(vinyl alcohol) montmorillonite nanocomposites. Iran Polym J 22, 519–536 (2013). https://doi.org/10.1007/s13726-013-0152-4

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  • DOI: https://doi.org/10.1007/s13726-013-0152-4

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