As per ISO with this method, a sample and a reference are subjected to a controlled temperature program heating, cooling or isothermal. The actual measured properties are the temperature of the sample and the temperature difference between sample and reference. From the raw data signals, the heat flow difference between sample and reference can be determined. The DSC systems are based on relevant instrument and application standards, e. Melting temperatures and enthalpies heats of fusion Crystallization temperatures and enthalpies Post-crystallization Glass transition temperatures Oxidative-induction time OIT and oxidative-onset temperature OOT Degree of crystallinity Solid-solid transitions Decomposition onset Polymorphism Phase transitions Liquid crystal transitions Eutectic purity Purity Determination Reaction temperatures and enthalpies Cross-linking reactions curing Degree of curing Specific heat capacity cp Distribution of crystal molecular weight qualitative, via peak shape Compatibility Kinetic studies.

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Designation: D — Copyright ASTM. Standard Test Method for. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

N OTE 1—True heats of fusion can only be determined in conjunction with structure investigation, and frequently, specialized crystallization techniques are needed. N OTE 2—This test method may be used in conjunction with Test Method D or E to simultaneously determine the temperatures of melting and crystallization.

N OTE 3—This test method may not be applicable to all types of polymers as written see 6. It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility of regulatory limitations prior to use. The ISO standard provides additional information not supplied by this test method. Referenced Documents. Current edition approved April 10, Published July Originally published as D — Last previous edition D — Terminologies E and E Summary of Test Method.

The heat of fusion, the heat of crystallization, and also the effect of annealing can be determined in polymers that possess them. Some polymers such as polyarylamides can be crystallized only from solution. Other polymers such as crystallizable polystyrene can only be annealed above their glass transition temperature. When this test method is used for polymers of this type, carefully annealed samples must be tested without conditioning.

Unless effects of moisture are to be studied, use of dry purge gas is recommended and is essential for operation at subambient temperatures.

D N OTE 7—Other specimen sizes may be used but shall be reported. The selection of temperature and time are critical when the effect of annealing is studied. Minimize the time of exposure to high temperatures. N OTE 8—Other heating rates may be used but shall be reported. It is the responsibility of the user of other rates to demonstrate equivalency to this standard. N OTE 9—For some polymers, this high-temperature annealing may result in degradation of the specimen.

In such cases, shorter annealing times may be used but shall be reported. Use this curve for the calculation of the heat of crystallization D Hc. Use this curve for the calculation of the heat of fusion D Hf. Precision and Bias. That is, bias 5 mean observed enthalpy of melting — known value.

Weissberger and B. Rossiter, eds. Wiley and Sons, Inc. The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

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ASTM D 3417 – 99 pdf free download



Differential Scanning Calorimetry (DSC)




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