2H solid-state NMR investigation of terephthalate dynamics and orientation in mixed-anion hydrotalcite-like compounds

Article Abstract:

2H variable-temperature solid-state nuclear magnetic resonance spectroscopy was used to study the dynamics and orientations of terephthalate (TA) anions in mixed-anion hydrotalcite-like compounds. An X-ray diffraction of the hydrotalcite-like compounds samples used in the study suggested that there were at least two interlayer regions. Results also indicated that the dynamics and orientations of terephthalate (TA) anions is influenced mainly by the presence of CO(sub 3)(super 2-) anions in the interlayer areas rather than the layer charge.

Terephthalic acid

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Thermal degradation in a trimodal poly(dimethylsiloxane) network studied by [super 1]H multiple quantum NMR

Article Abstract:

Thermal degradation of a filled, cross-linked siloxane material synthesized from poly(dimethylsiloxane) chains of three different average molecular weights and with two different cross-linking species is studied. The results suggest that thermal degradation proceeds by complex competition between oxidative chain scissioning and postcuring cross linking both of which contribute to embrittlement.

Science & research, Decomposition (Chemistry)

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Molecular dynamics simulations of ordering of poly(dimethylsiloxane) under uniaxial stress

Article Abstract:

Molecular dynamics simulations of bulk melts of poly(dimethylsiloxane) (PDMS) are utilized to study chain conformation and ordering under constant stress uniaxial extension at room temperature. Despite chain orientation and ordering in the direction of applied stress, crystallization is absent in the time and stress range of simulation.

Analysis, Observations, Siloxanes, Crystallization, Structure, Chemical properties

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