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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 large swathe via modern technology. inside of this area, advances in instrumentation let the applying of quantitative calorimetry to the whole spectrum of recent fabrics. this is illustrated might be no higher than via the set of contributions which make up this quantity four of Analytical Calorimetry. The learn supported during this fourth quantity of Analytical Calorimetry covers a wide selection 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 symbolize, partly, papers awarded sooner than 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 through trendy employees 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 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 houses 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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The purity of this material is only slightly lower than the C7 homolog. 0001%) was apparent on the 10 fold sample chromatrogram. A solid-solid transition is obvious in the DSC scan shown in Fig. 6. , a true solid-solid transition with no mesophase formation occurring after the first transition. Both a smectic and nematic mesophase are formed with the smectic much more energetic than in the C8 homolog. The expanded DSC trace is shown in Fig. 7. It is apparent that the nematic mesophase has a higher heat capacity than either the smectic or the isotropic liquid, which presented integration problems in the heat evaluation.

The data were collected and analyzed using on line data acquisition/reduction programs written for the IBM System/7-360/ 195. The solid to mesophase transition entropy was found to increase by the same amount per carbon number as the n-a1kanes. However, the absolute magnitude of the transition is larger by almost two carbon numbers than that expected from the corresponding paraffin. This four entropy unit (cal/mole/oK) offset is probably due to an increase in molecular dipole interactions caused by the alkoxy-bipheny1 linkage, which is supported by the thermal properties of p-n-a1ky1-p'- cyanobipheny1s.

The value of the nematic to isotropic liquid transition also appears to be low, Figure 9. However, this may not be the case. ) up to the p-p'-di-n-heptoxy derivative (10). u. for the p-p'-di-n-decyloxy derivative where the nematic vanishes. Thus, the low value of the p-n-hexyl-p'-cyanobiphenyl could be accurate and represent the last number of an alternating nematic sequence cited above. It is also interesting to note that the first smectic formed by the p-p'-di-n-alkoxyazoxybenzenes occurs at carbon length seven (10).

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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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