• 11:30-11:55
  • Zaal 1

Insights in block length distributions of thermoplastic polyurethans and polyesters

  • Harry Philipsen
  • DSM Engineering Materials

The average length of the constituting blocks in a block copolymer can be determined by spectroscopy, especially NMR. However, no information is obtained on the block length distribution. This would be important info though as especially the longer blocks fraction is thought to be responsible for e.g., crystallinity.
Recently, we investigated whether further insights in differences in block length distributions can be obtained by (off-line) coupled chromatography followed by NMR. By decoupling molar mass and chemical composition effects in the interactive chromatography step access to block length distributional information can be obtained as was shown by NMR experiments of 2D fractions. From the accurate description of residual molar mass effects and via non-parametric deconvolution semi-quantitative differences in block length distributions between individual samples could be determined.