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GB/T 33047.2-2021Plastics - Thermogravimetry (TG) of polymers - Part 2: Determination of activation energy (English PDF)

塑料聚合物热重法（TG）第2部分：活化能的测定

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

August 20, 2021

Implementation date

March 1, 2022

Scope

GB/T 33047.2-2021 is the English-translated version of 塑料聚合物热重法（TG）第2部分：活化能的测定.

GB/T 33047.2-2021 is the Chinese standard "Plastics - Thermogravimetry (TG) of polymers - Part 2: Determination of activation energy". Its scope clause reads: This document specifies a method to determine the activation energy Ea in the Arrhenius equation of the polymer decomposition reaction using the thermogravimetric method.

This method is only suitable for reactions with a single mechanism. For multi-step reactions, the reaction mechanism of each step is single. Its clauses include terms and definitions.

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Document preview — GB/T 33047.2-2021

National Standard of the People's Republic of China

Classification: G 31

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
1 Scope
2 Normative references
3 Terms and definitions

1 Scope

This document specifies a method to determine the activation energy Ea in the Arrhenius equation of the polymer decomposition reaction using the thermogravimetric method.

This method is only suitable for reactions with a single mechanism. For multi-step reactions, the reaction mechanism of each step is single.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations

Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

This document.

ISO 11358-1 Plastic Polymer Thermogravimetry (TG) Method Part 1.General Principles [Plastics-Thermogravimetry (TG) of polymers-Part 1.Generalprinciples]

3 Terms and definitions

ISO 11358-1 and the following terms and definitions apply to this document.

3.1 Arrhenius equation Arrhenius formula

The formula for the relationship between the rate constant of a chemical reaction and the temperature.

Note. The reaction rate constant k, expressed by Arrhenius equation (1), is as follows.

k=Aexp-Ea/RT (1)

Where.

R---gas constant, 8.314J·K-1·mol-1;

T---absolute temperature, the unit is open (K);

A-refers to the former factor, the unit is per second (s-1);

Ea---activation energy, in units of coke per mole (Jmol-1);

k ---Reaction rate constant (=dalpha/dt), the unit is per second (s-1).

3.2 Activationenergy

The energy required for an atom or molecule to change from a ground state to an active state where chemical reactions easily occur.

Note. The unit is joule per mole (J·mol-1).

3.3 Conversion rate

The ratio of the mass loss of the reaction at a specific time and temperature to the final mass loss.

Note 1.Given by equation (2).

alpha = (mi-mt)/(mi-mf) (2) […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 11358

Cited by

GB/T 44234-2024Nanotechnology—Measurement of thermodynamic and kinetic parameters of interface interaction between nanomaterials and gases—Microgravimetric analysis method

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