Laser light scattering polydispersity

PHEMA, the theoretical value iWntheo calculated with the monomer-to-initiator molar ratio and the conversion was used (for selected samples, the validity of this assumption was confirmed by GPC with a multiangle laser light-scattering (MALLS) detector). The following discussion will be based on M theo for absolute M and /Ww,PEG/Afn,PEG fot absolute polydispersity index. 

As already indicated in Chapter 7, the introduction of laser technology has already had a major impact on light-scattering methods. These have found particular application in the development of new methods of particle sizing, and several instruments are now available commercially which arc designed for the automatic determination of particle size distributions. These methods are being developed steadily, especially in terms of the associated computer software needed for the rapid analysis of experimental data. In particular, while the measurement of the particle size in monodisperse systems is well established, the mathematical analysis for polydisperse systems and for non-spherical particles presents problems which are not yet fully solved. 

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