TGA/DTA–FTIR–MS coupling as analytical tool for confirming inclusion complexes occurrence in supramolecular host–guest architectures

Varganici, Cristian–Dragos; Marangoci, Narcisa; Roşu, Liliana; Barbu-Mic, Cristian; Roşu, Dan; Pinteala, Mariana; Simionescu, Bogdan C.

doi:10.1016/j.jaap.2015.07.006

Cited by 18 publications

(6 citation statements)

References 40 publications

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“…Similar study was developed by Vargacini et al (2015) that described C-O-C vibrations with peak at ∼1109 cm −1 in inclusion complex involving 4,4′-bipyridinium-bis(siloxane) β-CD. This value peak is attributed to β-CD such as the present study (25). The PC and SC/β-CD showed intense bands of LIM's alkene group at 937 cm −1 suggesting complexation by these methods.…”

Section: Fourier Transform Infrared (Ft-ir) Spectroscopysupporting

confidence: 67%

Molecular Modeling and Physicochemical Properties of Supramolecular Complexes of Limonene with α- and β-Cyclodextrins

et al. 2016

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This study evaluated three different methods for the formation of an inclusion complex between alpha- and beta-cyclodextrin (α- and β-CD) and limonene (LIM) with the goal of improving the physicochemical properties of limonene. The study samples were prepared through physical mixing (PM), paste complexation (PC), and slurry complexation (SC) methods in the molar ratio of 1:1 (cyclodextrin:limonene). The complexes prepared were evaluated with thermogravimetry/derivate thermogravimetry, infrared spectroscopy, X-ray diffraction, complexation efficiency through gas chromatography/mass spectrometry analyses, molecular modeling, and nuclear magnetic resonance. The results showed that the physical mixing procedure did not produce complexation, but the paste and slurry methods produced inclusion complexes, which demonstrated interactions outside of the cavity of the CDs. However, the paste obtained with β-cyclodextrin did not demonstrate complexation in the gas chromatographic technique because, after extraction, most of the limonene was either surface-adsorbed by β-cyclodextrin or volatilized during the procedure. We conclude that paste complexation and slurry complexation are effective and economic methods to improve the physicochemical character of limonene and could have important applications in pharmacological activities in terms of an increase in solubility.

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Section: Fourier Transform Infrared (Ft-ir) Spectroscopysupporting

confidence: 67%

Molecular Modeling and Physicochemical Properties of Supramolecular Complexes of Limonene with α- and β-Cyclodextrins

et al. 2016

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“…It may be seen from Table 6 that one decomposition stage is observed for all nonirradiated and electron-beam-irradiated EPDM/butyl rubber samples, corresponding to the decomposition of EPDM for sample M and to its mixture with the butyl rubbers in the materials for the other samples. The presence of a single thermal degradation stage is also an indication of the good miscibility between material components, with the samples behaving as single-component systems [43]. The nonirradiated structures start to decompose in the temperature range 410–433 °C (T 5% ), whilst the those electron beam irradiated at 150 kGy thermally degrade at higher temperatures (415–445 °C).…”

Section: Resultsmentioning

confidence: 99%

Effects of Electron Beam Irradiation on the Mechanical, Thermal, and Surface Properties of Some EPDM/Butyl Rubber Composites

Stelescu

Airinei²,

Mănăilă

et al. 2018

Polymers

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The effects of electron beam irradiation on the properties of ethylene propylene diene monomer (EPDM)/butyl rubber composites in presence of a polyfunctional monomer were investigated by means of differential scanning calorimetry (DSC), thermal analysis, scanning electron microscopy (SEM), attenuated total reflection absorption infrared spectroscopy (ATR-IR), and mechanical and surface energy measurements. The samples were exposed over a wide range of irradiation doses (20–150 kGy). The EPDM matrix was modified with butyl rubber, chlorobutyl rubber, and bromobutyl rubber. The gel content and crosslink density were found to increase with the electron beam irradiation dose. The values of the hardness and modulus increased gradually with the irradiation dose, while the tensile strength and elongation at break decreased with increasing irradiation dose. The EPDM/butyl rubber composites presented a higher thermal stability compared to the initial EPDM sample. The incorporation of butyl rubbers into the EPDM matrix led to an increase in material hydrophobicity. A similar trend was observed when the irradiation dose increased. The greatest change in the surface free energy and the contact angles occurs at an irradiation dose of 20 kGy. The Charlesby–Pinner plots prove the tendency to crosslinking as the irradiation dose increases.

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“…It can be seen that all composites showed one thermal main decomposition stage, corresponding to the decomposition of EPDM and EPDM/butyl rubber mixture in the composites ( Figure 11 ). A single thermal degradation stage confirms the good miscibility between components [ 51 , 52 ]. The thermal degradation was shifted to higher temperatures (416–445 °C) ( T 5% ) for the samples irradiated at a dose of 150 kGy as compared to the non-irradiated composites (412–438 °C).…”

Section: Resultsmentioning

confidence: 81%

Radiation Processing and Characterization of Some Ethylene-propylene-diene Terpolymer/Butyl (Halobutyl) Rubber/Nanosilica Composites

Mănăilă

Airinei²,

Stelescu

et al. 2020

Polymers

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Composites based on ethylene–propylene–diene terpolymer (EPDM), butyl/halobutyl rubber and nanosilica were prepared by melt mixing and subjected to different doses of electron beam irradiation. The effect of irradiation dose on the mechanical properties, morphology, glass transition temperature, thermal stability and water uptake was investigated. The efficiency of the crosslinking by electron beam irradiation was analyzed by Charlesby–Pinner parameter evaluation and crosslink density measurements. The scanning electron microscopy data showed a good dispersion of nanosilica in the rubber matrix. An improvement in hardness and 100% modulus was revealed by increasing irradiation dose up to 150 kGy. The interaction between polymer matrix and nanosilica was analyzed using the Kraus equation. Additionally, these results indicated that the mechanical properties, surface characteristics, and water uptake were dependent on crosslink characteristics.

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TGA/DTA–FTIR–MS coupling as analytical tool for confirming inclusion complexes occurrence in supramolecular host–guest architectures

Cited by 18 publications

References 40 publications

Molecular Modeling and Physicochemical Properties of Supramolecular Complexes of Limonene with α- and β-Cyclodextrins

Molecular Modeling and Physicochemical Properties of Supramolecular Complexes of Limonene with α- and β-Cyclodextrins

Effects of Electron Beam Irradiation on the Mechanical, Thermal, and Surface Properties of Some EPDM/Butyl Rubber Composites

Radiation Processing and Characterization of Some Ethylene-propylene-diene Terpolymer/Butyl (Halobutyl) Rubber/Nanosilica Composites

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