Polymer Dispersity Determination by Diffusion-Ordered Spectroscopy (DOSY).

ABSTRACT: The dispersity (Ð) of a polymer is one of its most important characteristics. While the most established technique for dispersity determination is size exclusion chromatography (SEC), Diffusion-ordered NMR spectroscopy (DOSY) has emerged as a rival for routine polymer molar mass determination, even if dispersity remained somewhat elusive in DOSY to date. To expand DOSY to reliable dispersity measurement, we synthesize 26 polystyrenes with Ð ranging from 1.1 to 3.7 and number-average molar mass (M_n) ranging from 3.0 to 22.4 kg∙mol^-1 to correlate molar mass distribution (MMD) measurements of SEC to DOSY. We show that the method of inverse Laplace transformation (ILT) fails to represent the shape of the MMD of a polymer when it is not narrowly dispersed. Despite this fai

SUBMITTER: Silva IWF 

PROVIDER: S-EPMC12687685 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature