FTIR-ATR studies of the structure and dynamics of water molecules in polymeric matrixes. A comparison of PET and PVC

Article Abstract:

A Fourier transform infrared study of the perturbation of water 'sorbed' into the polymers PET and PVC as a function of crystallinity or plasticizer content has found direct evidence for the breaking of the water network in the polymer matrix in their component bands, a process depending on the polymer chemical and/or physical properties. Interactions of water with the polymer at the lower end of the hydrogen bond interaction scale were also observed. The intensity enhancement parameter, P, a measure of the perturbation of a particular water distribution due to dissolution in the polymer matrix, was also computed. It varies systematically with density in PET. For PVC, the plasticizer content significantly affects the sorption process and the equilibrium content and state of water.

Water, Polyvinyl chloride, Molecular spectra, Polyethylene terephthalate

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Supramolecular structure of the LiPFN-PVP system: 19F NMR studies

Article Abstract:

A study was conducted to analyze the supramolecular structure of lithium perfluorononanoate in D2O and in solutions of D2O supporting poly(vinylpyrrolidone) at different molecular weights. 19 F nuclear magnetic resonance spectroscopy was carried out to characterize the structure. The Varian HPLC and TSK PWx1 Toso Haas columns were utilized to perform gel-filtration chromatography. Results indicated a splitting of the CF3 resonance and a 1:1 ratio of bound micelles/free micelles.

Usage, Nuclear magnetic resonance spectroscopy, Micelles

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Site torsional motion and dispersive excitation hopping transfer in pi-conjugated polymers

Article Abstract:

An investigation into photoexcitations linked to intrachain, backbone modes of a flexible pi-conjugated polyarylene polymer is presented and their effect on the relaxational dynamics of migrative excitation is discussed.

Excited state chemistry

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