ISO 16014-5:2019

Current Revision
Plastics - Determination of average molecular weight and molecular weight distribution of polymers using size-exclusion chromatography - Part 5: Light-scattering method

Best Price Guarantee May 1, 2019 English 1 Pages

Sub Total (1 Item(s)) $ 0.00
Estimated Shipping $ 0.00
Total (Pre-Tax) $ 0.00
View in Library
or
International Organization for Standardization Logo

Plastics - Determination of average molecular weight and molecular weight distribution of polymers using size-exclusion chromatography - Part 5: Light-scattering method

PUBLISH DATE 2019

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
  • nonlinear homopolymers such as branched, star-shaped, comb-like, stereo-regular and stereo-irregular polymers
  • heterophasic copolymers whose molecular composition cannot vary

However, SEC-LS is not applicable to block, graft or heterophasic copolymers whose molecular composition can vary.

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.

Loading...

Failed to load document history.

Publish Date Document Id Type View