By W. W. Wendlandt (auth.), H. G. Wiedemann (eds.)

ISBN-10: 3034874138

ISBN-13: 9783034874137

ISBN-10: 3034874154

ISBN-13: 9783034874151

Earlier efforts within the box of thermal research have been concerned about the demonstration of the applicability of suggestions to a vast spectrum of fabrics and to set up the connection of such thoughts with different extra approved equipment. whereas such efforts will and will proceed, the 3rd foreign convention was once distinctive in that the 1st criteria have been disclosed for differential thermal research. This used to be the end result of the overseas, cooperative attempt of the ICTA's Standardization Committee. the criteria at the moment can be found from the United State's nationwide Bureau of criteria. hence, thermal research may be thought of to have attained its majority. Reali­ zation of complete adulthood might be anticipated within the close to destiny. Inclusion of plenary lectures in those volumes represents an important departure from earlier meetings. this modification is the results of the ICTA's popularity of its academic tasks. within the Foreword of the lawsuits of the second one overseas Confer­ ence, Professor L. Berg expressed the desire that thermal tools of research might locate wider software in technology and expertise. The quotation above, including the papers offered, point out the achievement of this desire. Xerox company C. B. Murphy Rochester, N.Y., U.S.A. President, ICTA 1968-1971 X sick PREFACE For the earlier 20 years thermoanalytical tools have reached a degree of substantial value, that is rather a result of advancements within the region of instrumentation.

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Furthermore, it is a fact that the true sample temperature cannot be measured within the sample but only the furnace temperature. Therefore,the true sample temperature has to be determined by applying a positive or negative temperature correction - called temperature lag to the temperature reading. This temperature lag is caused by the thermal resistance between furnace wall and sample. During an endothermic or exothermic caloric effect, an additional correction for the sample temperature, called differential temperature, has to be made.

3. Differential temperature In order to calibrate the ordinate scale in °C instead off V, a conversion has to be made. For this purpose the slope of a melting curve of a pure substance has to be determined. For a pure substance melting is known to be isothermal, while the reference cup is heated with the selected heating rate. The slope of the melting curve directly yields the sensitivity of the differential thermocouples in

29 THERMAL ANALYSIS · VOL. 4 0 10 T(O) 20 Fig. 6: Simulation of DTA curves for the broad step-change in thermal diffusivity of Fig. 08 em. Y=[qt-T(O)]-(qR 2 /4k), the amplitude from the glassy baseline in °C. The heating rate q is expressed in °C/sec. T(O) is arbitrarily in °C. 30 B. M. 4 em. I 60 1/ I I I / I -- -- __ ....... _______ _ I I I I ~ I I I I 40 T (OJ Fig. 7: Simulation of DTA curves for the narrow step-change in thermal diffusivity of Fig. 4 em. Y/q;t-(T(O)/q, the amplitude divided by heating rate, expressed in seconds.

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Advances in Instrumentation by W. W. Wendlandt (auth.), H. G. Wiedemann (eds.)


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