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Standard Test Method for the Assignment of the Glass Transition Temperature by Modulated Temperature Differential Scanning Calorimetry
Automaticky preložený názov:
Štandardná skúšobná metóda pre postúpenie teplota skleného prechodu modulovaným Teplotný diferenčný skenovací kalorimetria
NORMA vydaná dňa 15.4.2009
Označenie normy: ASTM E2602-09
Poznámka: NEPLATNÁ
Dátum vydania normy: 15.4.2009
Kód tovaru: NS-45710
Počet strán: 4
Približná hmotnosť: 12 g (0.03 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
cure, degree of cure, differential scanning calorimetry, glass transition temperature, modulated temperature differential scanning calorimetry, thermal analysis, ICS Number Code 17.200.10 (Heat. Calorimetry)
Significance and Use | ||||||||||||||
Materials undergo an increase in molecular mobility at the glass transition seen as a sigmoidal step increase in the heat capacity. This mobility increase may lead to kinetic events such as enthalpic recovery, chemical reaction or crystallization at temperatures near the glass transition. The heat flow associated with the kinetic events may interfere with the determination of the glass transition. The glass transition is observed in differential scanning calorimetry as a sigmoidal or step change in specific heat capacity. MTDSC provides a test method for the separation of the heat flow due to heat capacity and that associated with kinetic events making it possible to determine the glass transition in the presence of interfering kinetic event. This test method is useful in research and development, quality assurance and control and specification acceptance. Other methods for assigning the glass transition temperature include differential scanning calorimetry (Test Method E 1356), thermomechanical analysis (Test Method E 1545) and dynamic mechanical analysis (Test Method E 1640) |
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1. Scope | ||||||||||||||
1.1 This test method describes the assignment of the glass transition temperature of materials using modulated temperature differential scanning calorimetry (MTDSC) over the temperature range from –120 to + 600 °C. The temperature range may be extended depending upon the instrumentation used. 1.2 SI units are the standard. 1.3 There are no ISO equivalents to this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||||||||||||||
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