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ČSN EN ISO 16014-5 (640360)
Plastics - Determination of average molecular weight and molecular weight distribution of polymers using sizeexclusion chromatography - Part 5: Light-scattering method
Translate name
STANDARD published on 1.12.2019
The information about the standard:
Designation standards: ČSN EN ISO 16014-5
Classification mark: 640360
Catalog number: 508428
Publication date standards: 1.12.2019
SKU: NS-977062
The number of pages: 40
Approximate weight : 120 g (0.26 lbs)
Country: Czech technical standard
Category: Technical standards ČSN
The category - similar standards:
Annotation of standard text ČSN EN ISO 16014-5 (640360):
This document specifies a general method for determining the average molecular weight and the molecular weight distribution of polymers using SEC-LS, i.e. size-exclusion chromatography coupled with light-scattering detection. The average molecular weight and the molecular weight distribution are calculated from molecular weight data and weight concentrations determined continuously with elution time. The molecular weight at each elution time is determined absolutely by combining a light-scattering detector with a concentration-sensitive detector. Therefore, SEC-LS is classified as an absolute method. This method is applicable to linear homopolymers and to nonlinear homopolymers such as branched, star-shaped, comb-like, stereo-regular and stereo-irregular polymers. It can also be applied to heterophasic copolymers whose molecular composition cannot vary. However, SEC-LS is not applicable to block, graft or heterophasic copolymers whose molecular composition can vary. And the methods are applicable to molecular weights ranging from that of the monomer to 3 000 000, but are not intended for samples that contain > 30 % of components having a molecular weight < 1 000
Preview of the standard ČSN EN ISO 16014-5 (640360)
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