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ASTM E1824-08
Standard Test Method for Assignment of a Glass Transition Temperature Using Thermomechanical Analysis
4 стр.
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Разработчик:
Зарубежные/ASTM
Сборник (ASTM):
14.02 Particle and Spray Characterization; Forensic Sciences; Accreditation & Certification; Forensic Psychophysiology; Nanotechnology; Forensic Engineering / Характеристика гранул и аэрозолей; Судебные науки; Аккредитация и сертификация; Судебная психофизиология; Нанотехнологии; Судебная инженерия
Тематика:
Thermal Analysis
Описание
Значение и использование

The glass transition is dependent on the thermal history, softening agents or additives of the material to be tested. For amorphous and semicrystalline materials the assignment of a glass transition temperature may lead to important information about thermal history, processing conditions, stability, progress of chemical reactions, and mechanical and electrical behavior.

Thermomechanical analysis provides a rapid means of detecting changes in hardness or linear dimensional change associated with the glass transition. Dimensional changes measured as a specimen is heated over the Tg region may include the interaction of several effects: an increase in the coefficient of expansion, a decrease in the modulus, which under a constant stress leads to increased extension, stress relief leading to irreversible dimensional change (shrinkage in one dimension, expansion in another dimension), and physical aging effects which change the kinetics of the dimensional change.

This test method is useful for research and development, quality control, and specification acceptance testing; particularly of films and fibers.

Область применения

1.1 This test method describes a procedure for theassignment of a glass transition temperature of materials onheating using thermomechanical measurements under prescribedexperimental conditions.

1.2 This test method may be used as a complement toTest Method E 1545 and is applicable to amorphous or to partiallycrystalline materials in the form of films, fibers, wires, etc.that are sufficiently rigid to inhibit extension during loading atambient temperature.

1.3 The generally applicable temperature range forthis test method is − 100 to 600 °C. This temperature range may be altereddepending upon the instrumentation used.

1.4

1.5 There is no ISO method equivalent to thismethod.

1.6 This standard does notpurport to address all of the safety concerns, if any, associatedwith its use. It is the responsibility of the user of this standardto establish appropriate safety and health practices and determinethe applicability of regulatory limitations prior touse.

Ключевые слова:
glass transition; glass transition temperature; Tg; tensile mode; thermomechanicalanalysis (TMA); thermodilatometry; Glass transition (Tg)temperature; Tensile mode; Thermodilatometry; Thermomechanicalanalysis (TMA);