Download e-book for iPad: Analytical Calorimetry: Volume 4 by Aris Doelman, Annie R. Gregges, Edward M. Barrall II

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 enable the applying of quantitative calorimetry to the complete spectrum of recent fabrics. this is often illustrated possibly no larger than through the set of contributions which make up this quantity four of Analytical Calorimetry. The examine supported during this fourth quantity of Analytical Calorimetry covers a large choice of issues. the variety shows the sophistication which thermal research is attaining and extra­ ly the ever-widening purposes which are being built. The contributions to the quantity symbolize, partially, papers provided prior to 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. numerous extra key contributions are integrated by means of well-liked staff within the box. Julian F. Johnson Roger S. Porter v Quantitative Scanning Calorimetry with automatic information Acquisition and aid . . . . . . . 1 Aris Doelman, Annie R. Gregges, and Edward M. Barrall, II Thermodynamic homes of a chain 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 sequence 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 facts fifty one Cary F.

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Additional resources for Analytical Calorimetry: Volume 4

Example text

55 PREDICTING POLYETHYLENE LIFETIMES FROM THERMAL DATA TABLE I Experimental Samples Sample Number Stabilizer Added I None 130-200 II None 120-180 II. 10% Santanox 150-220 II. 20% Cyanox STDP 155-200 III None 160-230 Induction Time TemEerature Range C TABLE II Arrhenius Data From Induction Times SamEle Pre-exEonential Coef. Ea (kcal. 18 x 10- 13 31. F. YELIN Thermal Analysis A Perkin-Elmer Model DSC-2 was used to measure all oxidative induction times. 10. Samples were cold pressed and cut out to fit the standard aluminum sample pans.

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 equality of the absolute magnitude of the entropy change between n-alkanes and p-n-alkyl-p'-cyanobiphenyls is particularly THERMODYNAMIC PROPERTIES OF THE P-N-ALKYL-P'-CYANOBIPHENYLS 35 unusual.

Solid to Mesophase Transition Entropy as a Function of Alkyl Chain Length for a Series of p-n-alkoxy-p'-cyanobiphenyls THERMODYNAMIC PROPERTIES OF THE P-N-ALKOXY-P'-CYANOBIPHENYLS 47 by moving the microscope slide and cover slip. The Nematic+Isotropic liquid transition appears, in Fig. 5, to have an appreciable pre-melting component which was not noted on the lower homologs. This resulted in some uncertainty in the base line construction. The statistics on repeated integration of the nematic+isotropic liquid transitions were poorer than for the smaller but sharper smectic+nematic transition.

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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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