ISO 4765:2022 PDF

Name: ISO 4765:2022 — Chemically-induced ultra-weak photon emission (UPE) — Measurement as an analysis method of degradation of polymeric material
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Chemically-induced ultra-weak photon emission (UPE) — Measurement as an analysis method of degradation of polymeric material

Название (английский):

ISO 4765:2022

Chemically-induced ultra-weak photon emission (UPE) — Measurement as an analysis method of degradation of polymeric material

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 26
Дата публикации:: 1 апреля 2022 г.
Издание:: ISO IS 4765 edition 1 version 1
ICS:: 83.080.01

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Описание (английский):

This document provides a method for assessing the very early oxidative degradation state of polymers during outdoor weathering and indoor accelerated weathering tests and the influence of various additives can also be evaluated. This method is based on an analytical method in which the degree of progress of the oxidative degradation reaction of a polymer is sensitively detected by measurement of chemically induced ultra-weak photon emission (UPE).

Abstract

Похожие стандарты

Другие стандарты ISO

Overview - ISO 4765:2022 (UPE measurement for polymer degradation)

ISO 4765:2022 defines a standardized analytical method for detecting very early oxidative degradation of polymeric materials by measuring chemically-induced ultra‑weak photon emission (UPE). The method is applicable during outdoor weathering and indoor accelerated weathering tests and supports evaluation of the influence of additives (e.g., stabilizers). UPE measurement sensitively tracks oxidation kinetics (instantaneous emission) and the cumulative amount of oxidation products (time-integrated emission), enabling early-stage degradation assessment.

Key topics and technical requirements

Measurement principle

UPE (chemiluminescence) arises when peroxides formed during oxidation decompose and emit photons. Instantaneous UPE is proportional to reaction rate; integrated UPE correlates with oxidation product amount.
The method is a relative comparison tool, not an absolute aging metric.

Sample preparation

Typical sample mass: 10 mg to 20 g; use a balance with at least 1 mg resolution.
Samples of the same composition should have the same mass and surface area; handle with gloves and remove contaminants.

UPE measuring apparatus

Must control temperature (isothermal and/or non‑isothermal) and atmosphere (inert gas like N2 and oxidation‑accelerating gas like O2).
Light detection via highly sensitive photodetectors (e.g., photomultiplier tube (PMT) or cooled CCD); detectors are ideally cooled to below 0 °C to improve sensitivity.
Sample chamber features: quartz aperture plate, gas inlet/outlet, heating section, and a low‑emission sample container (stainless steel or aluminium commonly used).
Protective functions (e.g., shutter) and data processing for time‑course and numerical output are required.

Measurement parameters

Gate time (integration period) typically between 0.1 s and 10 s.
Procedures include background/dark current measurement, sensitivity checks (calibrated light source and empty‑container background), and confirmation of detector stability.

Reporting

Time‑course plots, peak metrics (height, area, time), and test conditions (atmosphere, temperature, gate time) should be included in the test report.

Applications and users

Practical uses:

Early detection of oxidative degradation during outdoor weathering and accelerated weathering.
Comparative evaluation of antioxidants and additive performance.
Monitoring residual stabilization and estimating oxidation induction time (OIT) trends.

Typical users:

Polymer R&D and formulation scientists
Quality control laboratories in plastics, coatings and composites industries
Accelerated weathering and materials testing labs
Additive manufacturers and failure‑analysis teams

Related standards / notes

The document states no normative references. It includes informative annexes with examples (e.g., OIT evaluation and UPE time courses) and emphasizes that the method is relative and complementary to other characterization techniques.

Keywords: ISO 4765:2022, ultra‑weak photon emission, UPE, chemiluminescence, polymer degradation, oxidative ageing, oxidation induction time, photomultiplier tube, accelerated weathering.

ISO 4765:2022 PDF

Abstract

Похожие стандарты

Overview - ISO 4765:2022 (UPE measurement for polymer degradation)

Key topics and technical requirements

Applications and users

Related standards / notes

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