ISO 16014-2:2019 PDF

Plastics — Determination of average molecular weight and molecular weight distribution of polymers using size-exclusion chromatography — Part 2: Universal calibration method

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ISO 16014-2:2019

Plastics — Determination of average molecular weight and molecular weight distribution of polymers using size-exclusion chromatography — Part 2: Universal calibration method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 15 мая 2019 г.
Издание:: ISO IS 16014 edition 3 version 1
ICS:: 83.080.01

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ruen

Срок поставки:2 раб. дн. (перевод)

Цена:150 €

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This document specifies a method for determining the average molecular weight and the molecular weight distribution of polymers using size-exclusion chromatography (SEC). The average molecular weight and the molecular weight distribution are calculated using a universal calibration curve instead of the conventional calibration curve. NOTE This test method is classified as a relative method as described in ISO 16014-1, but the average molecular weights and molecular weight distributions calculated by the method are equal to, or nearly equal to, the absolute values. For details, see the Annex A.

Технические детали

Технический комитет: ISO/TC 61/SC 5 - Physical-chemical properties
SKU: ISO 16014-2:2019

Abstract

Overview - ISO 16014-2:2019 (Universal calibration method)

ISO 16014-2:2019 is the ISO standard for determining the average molecular weight and molecular weight distribution of polymers using size-exclusion chromatography (SEC) with the universal calibration approach. Published as Part 2 of the ISO 16014 series (third edition, 2019), the standard specifies how to build and use a universal calibration curve - plotting lg([η]·M) versus elution time or volume - and how to convert SEC elution data into near-absolute molecular-weight values using the Mark–Houwink–Sakurada relationship ([η] = K·M^a).

Note: ISO 16014-2 is classed as a relative method (see ISO 16014-1) but, according to Annex A, typically yields average molecular weights and distributions equal or very close to absolute values.

Key topics and technical requirements

Universal calibration curve: prepare using narrow-distribution polymer standards (e.g., polystyrene, PMMA); plot lg([η]·M) vs elution time (t) or volume (V = t·Q).
Intrinsic viscosity and Mark–Houwink–Sakurada equation: use [η] = K·M^a to compute intrinsic viscosity or use directly measured [η] under the same elution conditions.
Calculation steps:
- Build universal calibration curve from standards.
- Determine [η] or use K and a values to compute [η] for sample fractions.
- Calculate molecular weight M at each elution time and compute average molecular weights, polydispersity, and differential/cumulative distributions per Clauses 9.2–9.4.
Data acquisition & processing: follows procedures in ISO 16014-1 (baseline correction, signal intensity H at each t).
Limitations and applicability: method assumes no specific interaction with column packing and that K and a are reasonably constant. It can be unreliable for strongly interacting polymers or extensively long-chain branched materials (see Annex A).
Documentation: include calibration curve, standard information, apparatus and measurement parameters, and results in the test report (Clauses 11.2–11.4).

Applications and who uses this standard

Laboratories performing polymer characterization by SEC seeking more universal / near-absolute molecular-weight results.
R&D and QC teams in plastics, polymer manufacturing, coatings, adhesives, and materials science.
Instrument vendors and service labs validating SEC systems and calibration procedures.
Academic researchers comparing polymer architectures (linear vs branched) and seeking consistent inter-laboratory results.

Related standards

ISO 16014-1 - General principles for SEC molecular-weight determination
ISO 16014-3 - Low-temperature SEC method
ISO 16014-4 - High-temperature SEC method
ISO 472 - Plastics - Vocabulary

Keywords: ISO 16014-2:2019, universal calibration, size-exclusion chromatography, SEC, molecular weight distribution, intrinsic viscosity, Mark–Houwink–Sakurada, polymer characterization.

Overview - ISO 16014-2:2019 (Universal calibration method)

Note: ISO 16014-2 is classed as a relative method (see ISO 16014-1) but, according to Annex A, typically yields average molecular weights and distributions equal or very close to absolute values.

Key topics and technical requirements

Universal calibration curve: prepare using narrow-distribution polymer standards (e.g., polystyrene, PMMA); plot lg([η]·M) vs elution time (t) or volume (V = t·Q).
Intrinsic viscosity and Mark–Houwink–Sakurada equation: use [η] = K·M^a to compute intrinsic viscosity or use directly measured [η] under the same elution conditions.
Calculation steps:
- Build universal calibration curve from standards.
- Determine [η] or use K and a values to compute [η] for sample fractions.
- Calculate molecular weight M at each elution time and compute average molecular weights, polydispersity, and differential/cumulative distributions per Clauses 9.2–9.4.
Data acquisition & processing: follows procedures in ISO 16014-1 (baseline correction, signal intensity H at each t).
Limitations and applicability: method assumes no specific interaction with column packing and that K and a are reasonably constant. It can be unreliable for strongly interacting polymers or extensively long-chain branched materials (see Annex A).
Documentation: include calibration curve, standard information, apparatus and measurement parameters, and results in the test report (Clauses 11.2–11.4).

Applications and who uses this standard

Laboratories performing polymer characterization by SEC seeking more universal / near-absolute molecular-weight results.
R&D and QC teams in plastics, polymer manufacturing, coatings, adhesives, and materials science.
Instrument vendors and service labs validating SEC systems and calibration procedures.
Academic researchers comparing polymer architectures (linear vs branched) and seeking consistent inter-laboratory results.

Related standards

ISO 16014-1 - General principles for SEC molecular-weight determination
ISO 16014-3 - Low-temperature SEC method
ISO 16014-4 - High-temperature SEC method
ISO 472 - Plastics - Vocabulary

Keywords: ISO 16014-2:2019, universal calibration, size-exclusion chromatography, SEC, molecular weight distribution, intrinsic viscosity, Mark–Houwink–Sakurada, polymer characterization.

ISO 16014-2:2019 PDF

Технические детали

Abstract

Overview - ISO 16014-2:2019 (Universal calibration method)

Key topics and technical requirements

Applications and who uses this standard

Related standards

Похожие стандарты

Abstract

Overview - ISO 16014-2:2019 (Universal calibration method)

Key topics and technical requirements

Applications and who uses this standard

Related standards

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