ISO 19935-3:2021 Plastics — Temperature modulated DSC —Part 3: Separation of overlapping thermal transitions
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Plastics — Temperature modulated DSC —Part 3: Separation of overlapping thermal transitions是国际标准化组织(International Organization for Standardization,简称ISO)于2021‑05‑19发布的ISO标准,适用于国际范围。标准截图

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标准文档类型为Plastics — Temperature modulated DSC —Part 3: Separation of overlapping thermal transitions高清PDF版本(文字版),标准文档内可进行搜索,可以复制原文,可粘贴。标准部分原文
INTERNATIONAL STANDARD ISO 19935-3:2021
Plastics — Temperature modulated DSC —
Part 3: Separation of overlapping thermal transitions
1 Scope
This document specifies a method for the separation of overlapping thermal transitions of plastics related to reversing and non-reversing heat flow rate, using temperature modulated differential scanning calorimetry.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 472, Plastics — Vocabulary
ISO 113571‑ , Plastics — Differential scanning calorimetry (DSC) — Part 1: General principles
ISO 199351‑ , Plastics — Temperature modulated DSC — Part 1: General principles
ISO 199352‑ :2020, Plastics — Temperature modulated DSC — Part 2: Measurement of specific heat capacity c
p
ISO 80000‑5 , Quantities and units — Part 5: Thermodynamics
3 Terms a nd definiti ons
For the purposes of this document, the terms and definitions given in ISO 472, ISO 113571‑ , ISO 199351 ‑
and ISO 80000‑5 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Symbols
4.1 Temperature modulation, T(t)
According to ISO 199351‑ .
4.2 Heating rate
According to ISO 199351‑ .
4.3 Heat flow rate, Φ(t)
According to ISO 199351‑ .
ISO 19935-3:2021
5 Principles
According to ISO 199351‑ .
The total heat flow rate signal is separated into a reversing and a non-reversing component by means of modulation of the heating rate. The reversing heat flow rate corresponds to the heat capacity component while the non-reversing heat flow rate corresponds to the kinetic component of the total heat flow rate.
Separation is limited to overlapping effects related to reversing (heat capacity) component and non‑
reversing (kinetic) component, respectively, on the time scale of modulation.
6 Apparatus and materials
The apparatus and materials shall be in accordance with ISO 199351‑ .
7 Calibration
7.1 General
According to ISO 199351‑ .
7.2 Calibration procedure
According to ISO 199352‑ .
7.3 Calibration of modulation amplitude
According to ISO 199351‑ .
7.4 Calibration of phase
According to ISO 199351‑ .
8 Procedure
8.1 General
The procedures of temperature modulated DSC, setting up the apparatus, loading the specimen into the crucibles, insertion of crucibles into the instrument, performing measurements, and removal of crucibles, shall be in accordance with ISO 113571‑ .
8.2 Experimental conditions
According to ISO 199352‑ .
The determination of reversing and non-reversing specific heat capacity shall be done in accordance with ISO 199351‑ .
8.3 Interpretation of results
According to ISO 199351‑ .
8.4 Examples of the results — S eparation of reversing and non-reversing heat flow rate
Figure 1 shows a typical example of quenched polyethylene terephthalate (PET).
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