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Characterization of molecular structure of acrylic copolymers prepared via emulsion polymerization using A4F-MALS technique

High levels of acrylate in poly(methyl methacrylate), or PMMA, lead to formation of highly branched, compact macromolecules with ultra-high molar masses. The interaction of these short branches with column packing pores leads to abnormal (non-monotonic) elution in size-exclusion chromatography, resulting in poor separation and characterization by any means including viscometry or light scattering. In addition, these large polymers are subject to degradation by shear forces in the SEC column. Stepan Podzimek and co-authors show that separation by organic AF4 in tetrahydrofuran solvent overcomes the problems associated with SEC for PMMA, and permits accurate characterization of molar mass, size, conformation and branching ratio.

Podzimek, S.; Machotova, J.; Snuparek, J.; Vecera, M.; Prokupek, L. Journal of Applied Polymer Science  2014, 131, 40995. doi:10.1002/app.40995

 

   

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Wyatt Technology is the recognized leader in light scattering instrumentation and software for determining the absolute molar mass, size, charge and interactions of macromolecules and nanoparticles in solution.

Wyatt's line of multi-angle static light scattering products couple to size exclusion chromatography (SEC-MALS), field-flow fractionation (FFF-MALS), and stop-flow composition-gradient systems (CG-MALS). Our dynamic light scattering (DLS) products operate in traditional cuvette as well as on-line and automated, high-throughput modes. We also offer unique instruments for electrophoretic light scattering (MP-PALS), differential refractometry, and differential viscosity.



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