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Poly(ethylene glycol) plasticizer is blended with a PEO-based single-ion conductor to lower the glass transition temperature of the ionomer and solvate the lithium counterions. With increasing plasticizer content at room temperature, FTIR spectra indicate that the fraction of ions in isolated ion pairs increases relative to those in ionic aggregates, and X-ray scattering data indicate that the ionic...
The molecular dynamics of solutions of poly(2-vinylpyridine) (P2VPy) and a series of low molecular weight phenols containing from one to six hydroxyl groups were investigated using broadband dielectric spectroscopy (DRS). Dynamic mechanical analysis, Fourier transform infrared spectroscopy, differential scanning calorimetry, small-angle X-ray scattering and wide-angle X-ray diffraction were employed...
Two South African coals of the same rank and age, but different in maceral composition were subjected to extensive structural analyses. Inertinite-rich Highveld coal (dominated by semifusinite) and vitrinite-rich Waterberg coal were studied to determine structural differences and similarities. The two coals had similar carbon content (∼84%, dmmf) and vitrinite reflectance (mean-maximum 0.71% for vitrinite-rich...
The volume phase transitions in hydrogen bonded polymer gels are investigated. The elastic contribution is obtained by a modification of the Flory–Rehner approach proposed previously, where the affine deformation assumption is abandoned and instead the assumptions of the c* model of de Gennes are adopted. The mixing term is modified to account for hydrogen bonding. The calculations (both binary and...
It has been determined from an infrared analysis of miscible blends of n-butyl methacrylate-co-4-vinylphenol and styrene-co-2-vinyl pyridine copolymers that the fraction of hydrogen-bonded carbonyl groups actually increases with temperature. At first glance, this is counterintuitive, but it is entirely consistent behaviour for a multicomponent hydrogen-bonding system containing competing acceptor...
Self-association and interassociation equilibrium constants determined from i.r. studies of miscible poly(2,6-dimethyl-4-vinyl phenol) (PDMVPh) and poly(2,6-diisopropyl-4-vinyl phenol) (PDIPVPh) blends with poly(n-butyl methacrylate) and an ethylene-co-vinyl acetate (EVA) copolymer are used to calculate theoretical miscibility windows for the homologous series of poly(n-alkyl methacrylate)s and the...
Equilibrium constants that describe the self-association of poly(2,6-dimethyl-4-vinyl phenol) and poly(2,6-diisopropyl-4-vinyl phenol) together with their interassociation to complimentary (co)polymers that contain carbonyl moeties, such as methacrylates and acetoxy groups, have been determined from i.r. studies of miscible polymer blend systems containing poly(n-butyl methacrylate) and an ethylene-co-vinyl...
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