Download PDF by Aris Doelman, Annie R. Gregges, Edward M. Barrall II: Analytical Calorimetry: Volume 4

By Aris Doelman, Annie R. Gregges, Edward M. Barrall II (auth.), Roger S. Porter, Julian F. Johnson (eds.)

ISBN-10: 1461564433

ISBN-13: 9781461564430

ISBN-10: 146156445X

ISBN-13: 9781461564454

Thermal research cuts a extensive swathe via modern technological know-how. inside this area, advances in instrumentation let the applying of quantitative calorimetry to the complete spectrum of recent fabrics. this is illustrated might be no higher than by way of the set of contributions which make up this quantity four of Analytical Calorimetry. The study supported during this fourth quantity of Analytical Calorimetry covers a large choice of themes. the diversity exhibits the sophistication which thermal research is attaining and extra­ ly the ever-widening functions which are being constructed. The contributions to the quantity signify, partly, papers provided ahead of the department of Analytical Chemistry on the Fourth Symposium on Analytical Chemistry held on the 172nd nationwide assembly of the yankee Chemical Society, August 29 - September three, 1976. a number of extra key contributions are integrated through well-liked staff within the box. Julian F. Johnson Roger S. Porter v Quantitative Scanning Calorimetry with automated information Acquisition and aid . . . . . . . 1 Aris Doelman, Annie R. Gregges, and Edward M. Barrall, II Thermodynamic houses of a sequence of P-N-Alkyl-P'-Cyanobiphenyls 19 E. M. Barrall II, R. J. Cox, A. Doelman, N. Clecak, J. A. Logan, and A. R. Gregges Thermodynamic homes of a chain of 37 P-N-Alkoxy-P'-Cyanobiphenyls R. J. Cox, E. M. Barrall II, A. Doelman, N. J. Clecak, J. A. Logan, R. D. Diller, and A. R. Gregges a brand new Equation for Predicting Polyethylene Lifetimes from Thermal info fifty one Cary F.

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F. YELIN analysis. The oxygen uptake procedure (1) is based on volumetric measurements of the rate at which oxygen combines with a polymer under isothermal conditions. An apparatus suitable for this test is shown in Figure 1. The data developed is shown graphically in Figure 2. Either the time required for consumption of a specified amount of oxygen may be measured or the extrapolated induction period obtained. The induction period or oxidative induction time is characteristic of the reaction of polyenes under these conditions.

Here, subcell is employed as defined by Vand (13). The polymorphism observed both in this work and by Gray (2) is in agreement with an n-alkane arrangement of the tails. For lower carbon numbers of the series, below octyl, the entropy differences between orthorhombic and triclinic arrangements is small, and either form may dominate depending on the conditions of recrystallization. This polymorphic behavior has been reported by Larsson for the glycerides where n-alkane packing is recognized (14).

The alkoxy series, in common with the alkyl series, appears to have an intercalated solid phase with the molecular order residing in paraffinic subcells. REFERENCES 1. 2. Gray, G. , Harrison, K. J. and Nash, J. , Electron Lett. 130 (1973). , Gray, G. , Harrison, K. , and Nash, J. , Hulme, D. , Korton, J. and Raynes, E. , Proceedings of the Symposium on Ordered Fluids and Liquid Crystals, R. S. Porter and J. F. 6l7. J. COX ET AL. 3. Gray, G. , Harrison, K. J. and Nash, J. , 1, 381 (1975). 4. Kahn, F.

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Analytical Calorimetry: Volume 4 by Aris Doelman, Annie R. Gregges, Edward M. Barrall II (auth.), Roger S. Porter, Julian F. Johnson (eds.)

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