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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
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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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2007
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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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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