Plastics — Differential Scanning Calorimetry (DSC) — Part 3: Determination of Temperature and Enthalpy of Melting and Crystallization
Warning — The use of this International Standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate health and safety practices and to determine the applicability of regulatory limitations prior to use.
1 Scope
This part of GB/T 19466 specifies a method for the determination of the temperature and enthalpy of melting and crystallization of crystalline or semi-crystalline plastics.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of GB/T 19466. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 19466.1-2004 Plastics — Differential Scanning Calorimetry (DSC) — Part 1: General Principles (idt ISO 11357-1:1997)
3 Terms and Definitions
For the purposes of this part, the terms and definitions given in GB/T 19466.1 and the following apply.
3.1
melting
the transition stage between a fully crystalline or partially crystalline solid state and a liquid of variable viscosity
Note: The transition, also referred to as fusion, is characterized by an endothermic peak in the DSC curve.
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3.2
crystallization
the transition stage between the amorphous liquid state and a fully crystalline or partially crystalline solid state
Note: The transition is characterized by an exothermic peak in the DSC curve. An exception to this definition is the case of liquid crystals, where the term “amorphous liquid” should be replaced by “ordered liquid”.
3.3
enthaipy of fusion
the heat required to melt a material at constant pressure, measured in kJ/kg
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Principle
5 Apparatus and Materials
6 Test Specimens
7 Test Conditions and Specimen Conditioning
8 Calibration
9 Procedure
10 Expression of Results
11 Precision
12 Test Report
Annex A (Informative) Precision for Measurements of HDPE and PP
Bibliography
