Wunderlich studies

The determination of the heat capacity of a substance as a function of the temperature is by itself a very important application of DSC, because it may lead to values of the thermodynamic functions S%, //-" — //q, and Gy, mentioned in chapter 2. An example is the study of C6o carried out by Wunderlich and co-workers [271], The application of DSC in the area of molecular thermochemistry has been particularly important to investigate trends in transition metal-ligand bond dissociation enthalpies. The typical approach used in these studies, and its limitations, can be illustrated through the analysis of the reaction 12.27, carried out by Mortimer and co-workers [272] ... 

The work of Krebs and Wunderlich ( ) has been followed by a number of studies (3,13,15-20), demonstrating that particle size fractionation will also occur with a porous matrix. In this case,... 

The side-chain alkylation reaction of aromatic hydrocarbons has also been studied using unsaturated aromatic olefins, especially styrene. Pines and Wunderlich 43) found that phenylethylated aromatics resulted from the reaction of styrenes with arylalkanes at 80-125° in the presence of sodium with a promoter. The mechanism of reaction is similar to that suggested for monoolefins, but addition does not take place to yield a primary carbanion a resonance stabilized benzylic carbanion is formed [Reaction (23a, b)j. 

Transport polymerization has also been studied with other monomers, including methylene and other carbenes (phenylcarbene, 1,4-phenylenecarbene), silylenes such as Si2 and germy-lenes such as GeCl2 and Ge2 [Lee, 1977-1978 lee and Wunderlich, 1978]. 

Fltickiger-lsler, S., Baumeister, M., Braun, K., Gervais, V, Hasler-Nguyen, N., Reimann, R., Van Compel, J., Wunderlich, H. et al. (2004) Assessment of the performance of the Ames 11 assay a collaborative study with 19 coded compounds. Mutation Research, 558, 181-197. 

Gaur, U. and Wunderlich, B. Study of microphase separation in block copolymers of styrene and alpha-methylstyrene in the glass transition region using quantitative thermal analysis. Macromolecules 13, 1618 (1980)... 

Crystallisation of most polymers is accompanied by the separation of different molecular species, a process referred to as molecular fractionation. Bank and Krimm [147] provided the first direct evidence of molecular fractionation in polyethylene. The first extensive study performed by Wunderlich and Mehta [148] indicated that, at each crystallisation temperature, there exists a critical molar mass (MCIjt) such that the molecules of molar mass greater than Mcrjt, are able to crystallise at this temperature, whereas... 

For isotropic polyethylene, the hexagonal phase is usually observed at elevated pressure and temperature, in fact, above the triple point Q located at 3.4 kbar and 220 °C according to the pioneering work of Bassett et al. [20] and Wunderlich et al. [21]. Later, more detailed studies involving in situ light microscopy and X-ray studies showed that the equilibrium point, Q0, is located at even higher temperatures and pressures, 250 °C and 5.3 kbar, re-... 

More recently 211 At adsorbed on silver coated human serum albumin (HSA) microspheres has been used by Wunderlich, Doberenz and their colleagues46,94-99 to study the accumulation of the isotope in some tumour-bearing tissues of mice and pigs, and in one special case for human therapy100. 

Wunderlich, B. Study Of the change in specific heat of monomeric and polymeric glasses during the glass transition. J. Phys. Chem. 64,1052—1056 (1960). 

B. Wunderlich, Rensselaer Audio Courses in Thermal Anaysis and Polymers. For information contact the author or the Office of Continuing Study, Rensselaer Polytechnic Institute, Troy, N.Y. 12181 ... 

Fluckiger-Isler S, Baumeister M, Braun K, Gervais V, Hasler-Nguyen N, Reimann R, Van Gompel J, Wunderlich HG, Engelhardt G. Assessment of the performance of the Ames II assay A collaborative study with 19 coded compounds. Mutat Res 2004 558 181-97. 

The heat capacity of SnSe2(cr) was measured in the temperature range 230 to 570 Kina careful study by Wiedemeier, Pultz, Gaur, and Wunderlich [81WIE/PUL]. Their results are selected ... 

The structure of otonecine (125) was established by degradation. The presence of the transannular system was confirmed by the X-ray studies of Wunderlich on an alkaloid containing otonecine. This base is found as part of many seco-pyrrolizidine alkaloid structures. The existence of a new alkaloid, isosenkirkine, has been reported in preliminary form. It is stated to contain a new transannular base with the opposite chirality to otonecine... 

Czornyj G, Wunderlich B (1977) Preparationen and study of separated single crystals of extended-chain polyethylene. J. Polymer ScL, Polymer Phys. Ed. 75 1905... 

This seemingly simple entropy-separation process has been widely adopted in the thermodynamic studies of polymer crystallization. Nevertheless, the hypothetical principle underlying Eqs. (7.13) and (7.14), in conjunction with the physical meaning of the y value at the transition point, has been controversial in the literature [Karasz etal., 1977 Wunderlich and Czornyj, 1977 Naoki and Tomomatsu, 1980 Wiirflinger,... 

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