Correlation between positron annihilation lifetime parameters and T1ρ relaxation times determined from solid state NMR at the compositional phase segregation point of graft copolymers

Elhrari, Wael; Assumption, Heidi; Mallon, Peter E.

doi:10.1016/j.polymer.2015.09.006

Cited by 1 publication

(2 citation statements)

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“…The signal at about 18 ppm is referred to the methyl groups belonging to Zr 4 oxocluster and to MMA [ 14 , 39 ]; the signal at 23 ppm, for the Zr 4 MAPTMS(1:100) hybrid, and the peaks at 45 ppm and at 55 ppm, the latter being only present in the Zr 4 MMA (1:100) and Zr 4 MMA/TFMA (7:3) (1:100) hybrids, are related to the main chains of the MMA-[ 40 ] and the MAPTMS-[ 41 ] based polymers. The broad signal at 68 ppm of the Zr 4 MAPTMS (1:100) hybrid is related to the methoxy carbon atoms of the silane [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

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Tuning the Activity of a Hybrid Polymer–Oxocluster Catalyst: A Composition—Selectivity Correlation

et al. 2021

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Zr-based oxoclusters MxOy(OR)w(OOR’)z are promising catalysts for the activation of hydrogen peroxide. However, they need to be integrated into suitable matrices to increase their hydrolytic stability and allow for their recovery after use. Polymeric materials can be successfully employed for this aim, since they modify the properties of the resulting hybrid materials, in terms of polarity and chemical affinity for the substrates, improving the catalytic activity. Herein, we report the synthesis of different acrylic polymers based on various co-monomers (methyl methacrylate (MMA), 2,2,2-trifluoroethylmethacrylate (TFMA) and 3-methacryloxypropyltrimethoxylsilane (MAPTMS)) covalently cross-linked by a Zr4-based oxocluster, whose composition was tuned to optimise the catalytic oxidation of methyl p-tolyl sulphide. To assess their properties and stability, the materials were characterised via Fourier Transform Infrared (FT-IR) and Raman spectroscopies, Thermogravimetric Analysis (TGA), Solid-State NMR (SS-NMR) and X-Ray Absorption Spectroscopies XAS, before and after catalytic turnover.

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Section: Resultsmentioning

confidence: 99%

“…The broad signal at 68 ppm of the Zr 4 MAPTMS (1:100) hybrid is related to the methoxy carbon atoms of the silane [ 41 ]. The carbonyl group of MMA is visible at 178 ppm [ 39 ], while the weak signals between 120 and 140 ppm are assigned to residual unreacted olefinic carbon atoms.…”

Section: Resultsmentioning

confidence: 99%