Determination of weight-average molecular weights of polymers in chromophoric solvents using low-angle laser light scattering

Use of low-angle laser light scattering with gel permeation chromatography for the molecular mass determination of biomolecules.

486 Use of low-angle laser light scattering with gel permeation chromatography for the molecular mass determination of biomolecules K. Jumel,* P. Br0wne.t and J. F. Kennedy# *Chembiotech Ltd, Institute of Research and Development, Vincent Drive, Edgbaston, Birmingham B I5 2sQ, U.K.; tLDC Analytical, Diamond Way, Stone Business Park, Stone, Staffs STI 5 OHH, U.K. and $Research Laboratory for the...

Solution Properties of 1,3-Cyclohexadiene Polymers by Laser Light Scattering and Small-Angle Neutron Scattering

A new derivation of average molecular weights of nonlinear polymers.

A new method for calculating average molecular weights is presented for nonlinear polymers. In contrast to the previous methods of Flory and Stockmayer which first calculate the distribution of all species and then use the distributions to calculate average properties, the new method calculates these properties directly. In contrast to the method of Gordon, probability generating functions are ...

Characterisation of reference standards by low-angle laser light scattering (laser diffraction) particle size analysis

Polydisperse glass microsphere standards were analysed by 25 international teams of particle metrology specialists using unambiguous methods such as microscopy, sedimentation, electroformed sieving and Coulter counting. The nominal size distributions were: 1-10, 3-30, 10-100 and 50-350 microns (m). The Laser Diffraction Proficiency Testing Scheme (LDPTS) then sent the samples to about 65 parti...

Determination of the absolute molecular weight averages and molecular weight distributions of alginates used as ice cream stabilizers by using multiangle laser light scattering measurements.

High-performance size exclusion chromatography with multiangle laser light scattering detection (HPSEC-MALLS) was used for characterizing complete molecular weight distributions for a range of commercial alginates used as ice cream stabilizers. For the samples investigated, molecular weight averages were found to vary between 115 000 and 321 700 g/mol and polydispersity indexes varied from 1. 5...