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REVISTA DE CHIMIE
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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2016, Volume 67, Issue 10,





Monika Sandor, Cristina Lavinia Nistor, Cristian Petcu, Violeta Purcar, Mircea Vuluga, Sabina Nitu, Bogdan Trica, Dan Donescu
Oxidative Degradation of Polyether Polyol - Silica Hybrids
Prepared by Sol - Gel Process

Abstract:

The paper presents the preparation and properties of new silica hybrid materials, synthesized in the presence of two commercially available polyether polyols (PETOL-36-3 BR or PETOL-48-3 MB), as such or functionalized with (3-isocyanatopropyl)triethoxysilane (NCOTEOS). The two polyether polyols are actually branched polyether triols, produced from glycerine-propoxylated-ethoxylated and having primary (PETOL-36-3 BR) and respectively secondary (PETOL-48-3 MB) hydroxyl end-groups. The functionalization of the two triols with NCOTEOS was made in the lab, in order to improve the coupling efficiency of the polymeric component to the silica network, produced in situ by the sol-gel reactions of triethoxymethylsilane (MeTES) and triethoxyvinylsilane (VTES). The polyol/NCOTEOS molar ratio was 1/1. Thus, the attachment of the ethoxysilane functions to the end of one of the polyol’s branch was achieved through urethane bonds, formed after the reaction of the hydroxyl end group of the polyol with the isocyanatopropyl- function of NCOTEOS. Evaluation of the coupling degree of the polyols to the silica network and of the rheological behavior during synthesis, as well as the 13C NMR spectra indicated that the functionalization of the polyols with NCOTEOS occurred. The oxidation onset temperature (OOT) of hybrid materials was investigated for evaluating the hybrids stability towards the oxidative degradation. The intensity of chemiluminescence (CL) emission of the obtained materials was measured after exposing to ionizing radiation (radiation dose 0.5 kGy/h). It was found that the oxidation onset temperatures for the reference samples decreased faster with the increase of the irradiating dose for samples based on the un-modified polyols, comparing with samples based on the polyols functionalized with NCOTEOS. Therefore, by the functionalization of the polyols with NCOTEOS an improved quality of the final hybrid materials was observed. Keywords: sol-gel method, hybrid systems, polyether polyols, chemiluminescence

Issue: 2016, Volume 67, Issue 10
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This article is published under the Creative Commons Attribution 4.0 International License
 
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