A generalized method for evaluating the molecular weight distribution and molecular weight averages for polymers undergoing random scission

Rheological Method for Determining Molecular Weight and Molecular Weight Distribution

Gel Permeation Chromatography . I . A New Method for Molecular Weight Distribution of High Polymers

Polystyrene gels crosslinked in the presence of dilucnts have been iliatie in tinc-iiii.sli bead forni suitable for packing into chromatographic rolurnns. A series of narrow molecular weight range pol) mer fractions w&s eluted through such columns with aromatic and chlorinated solvents. EfHuent concentrations were detected and recorded by a continuous differential refractoineter. The fractions ...

Molecular Weight Profiles of Proanthocy Anidin Polymers

The MW profiles of proanthocyanidin polymers (condensed tannins) from 32 samples representing a wide range of plant tissues of many different species have been obtained by gel permeation chromatography of the peracetate derivatives. The tannins vary widely in MW, with Al. values for the peracetates in the range 1600-5500. The MW profiles vary greatly from those with narrow, rather smooth distri...

The gamma distribution model for pulsed-field gradient NMR studies of molecular-weight distributions of polymers.

Self-diffusion in polymer solutions studied with pulsed-field gradient nuclear magnetic resonance (PFG NMR) is typically based either on a single self-diffusion coefficient, or a log-normal distribution of self-diffusion coefficients, or in some cases mixtures of these. Experimental data on polyethylene glycol (PEG) solutions and simulations were used to compare a model based on a gamma distrib...

The molecular-weight distribution of glycosaminoglycans.

1. A rapid and sensitive method for the accurate estimation of the molecular-weight distribution of keratan sulphate and chondroitin sulphate isolated from adult bovine nasal septum and intervertebral disc is described. The method utilizes gel chromatography of reductively labelled glycosaminoglycan and end-group estimation of number-average molecular weight for each fraction across the peak of...