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Showing 1 to 9 of 9 for “"Secondary relaxation"”.
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Secondary relaxation processes in neat and binary glass formers studied by 2H NMR spectroscopy
… to the base circle of a cone, i.e. also the secondary relaxation is not significantly affected by the translational symmetry of the PC phase. As alpha- and beta-process do not merge in cyanocyclohexane, pronounced effects were observed at high temperatures: for the first time an additional …
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Detection and characterisation of secondary relaxations in solids using thermally stimulated current spectroscopy
… for the detection and characterisation of secondary relaxation phenomena in the crystalline state for a number of low-molecular weight organic materials (LOMs), namely α-alanine, β-alanine, a co-crystal system (salicylic acid and benzamide) and the drug paracetamol (form I). The aim of the …
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Physical Aging of Miscible Polymer Blends
… differences in the compositional dependence of secondary relaxation intensity, segmental cooperativity which dictates glass formation kinetics, and density (prior to aging). The variation of volume relaxation rate with aging temperature and composition was interpreted based upon these …
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Synthesis and Characterization of Poly(arylene ether sulfone)s with Novel Structures and Architectures
… cyclohexyl units impart a higher magnitude of secondary relaxation than the terephthaloyl units while maintaining high modulus, suggesting that these polymers may have higher impact strength than the ones with no cyclohexyl units.
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Study of relaxation processes in simple glass formers by means of 2H NMR spectroscopy
… echo decays, spin-lattice and spin-spin relaxation). We focused our attention on glass forming liquids that were composed of simple, rigid molecules in order to study the properties of the secondary relaxation processes (beta-processes) in the glassy state (0.5Tg<T<Tg). For several …
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A study of the mechanisms of milling-induced enhancement of solubility and dissolution rate of poorly soluble drugs
… phase, that can be characterised by dielectric relaxation spectroscopy (DRS), ii) THz spectroscopy provides estimates for residual crystallinity in lactose monohydrate that were much lower than the estimates from the thermal techniques. Such estimates of residual crystallinity are considered to …
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Primary and Secondary Relaxations in Neat and Binary Glass Formers Studied by Means of Dielectric Spectroscopy
… the temperature evolution of primary and secondary relaxation phenomena. The other objective is to gain insight into the microscopic origin of the beta-process (a secondary relaxation observed for T<Tg) in neat and binary systems, as well as the primary relaxation phenomena in binary …
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Photon correlation spectroscopy study of slow relaxation in alkali germanate and phosphate germanate glass melts
The study of relaxation dynamics in network-forming oxide glass melts has been a long-standing challenge in condensed matter physics, owing in large part to the scarcity of experimental data compared to the wealth of studies conducted on molecular liquids and organic polymers. Over the past two …
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Dielectric Properties of Molecular Glass Formers; from the Liquid State to the Tunneling Regime
… work starts with analyzing the characteristic relaxation features in molecular systems above Tg. Here, secondary relaxation processes emerge on the high frequency side of the main (alpha) relaxation peak, namely the excess wing (EW) and the beta-process. The EW manifests itself in the …