Effect of Oxidation Temperature on the Crystalline Phase of Polypropylene in Composites with Single-Walled Carbon Nanotubes

O. M. Palaznik; Палазник О. М.; P. M. Nedorezova; Недорезова П. М.; V. G. Krasheninnikov; Крашенинников В. Г.

doi:10.31857/S2308112023700591

Effect of Oxidation Temperature on the Crystalline Phase of Polypropylene in Composites with Single-Walled Carbon Nanotubes

作者: Palaznik O.M.¹, Nedorezova P.M.¹, Krasheninnikov V.G.¹
隶属关系:
1. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
期: 卷 65, 编号 4 (2023)
页面: 296-305
栏目: КОМПОЗИТЫ
URL: https://ter-arkhiv.ru/2308-1120/article/view/650820
DOI: https://doi.org/10.31857/S2308112023700591
EDN: https://elibrary.ru/VEFJEZ
ID: 650820

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详细

The effect of thermal oxidation on the crystalline phase of polypropylene in composites with single-walled carbon nanotubes has been studied. The composites are synthesized in propylene bulk using a homogeneous catalytic system rac-Me2Si(2-Me-4PhInd)2ZrCl2, activated by methylaluminoxane. The effect of thermal oxidation on thermophysical characteristics (the heat of melting and the melting temperature) measured by DSC and changes occurring in the polymer investigated by IR spectroscopy is studied. Changes in the structure of PP during thermo-oxidative degradation are studied by DSC at 140 and 170°С, that is, before and after melting of the samples. It is shown that the oxidized PP in the composites possesses a higher degree of crystallinity and a more perfect structure than the pure PP. At 170°С the effect of thermo-oxidative stabilization is observed only at low filling degrees (up to 3 wt %), in agreement with the TGA data. An analysis of IR spectra demonstrates that the presence of nanotubes in PP‑based composites during oxidation slows down the formation of oxygen-containing groups in the polymer. The conclusion is made that carbon nanotubes inhibit the thermal oxidation of polypropylene in the composites.

参考

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