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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Light-scattering study of the aggregation of syndiotactic poly(methyl methacrylate) in solution.

Syndiotactic poly(methyl methacrylate (s-PMMA) may undergo aggregation in n-butyl chloride (n-BuCl) at temperatures below the theta temperature. The aggregation behavior of the s-PMMA with weight-average molecular weight M(w) =6.06 x 10(5) g mol(-1) was studied by a combination of static and dynamic laser-light-scattering experiments. A solution of concentration 1.12 x 10(-4) g mL(-1) was quenched from 50 degrees C (above the theta temperature in n-BuCl, 35 degrees C to 12 degrees C, and the aggregation process was measured over 60 h. The time dependence of M(w) the root-mean-square z-average radius of gyration < R(g) >, and the average hydrodynamic radius <R(h)> were used to monitor the growth of the aggregates, with the result M(w) approximately < R(g) > d(f) (where d(f) = 1.98 +/- 0.02), which implies the formation of a fractal aggregate. The observed fractal dimension, d(f), is close to that expected for a reaction-limited cluster aggregation for which d(f) = 2. 1. In addition, atomic force microscopy was used to image the aggregates.[1]

References

  1. Light-scattering study of the aggregation of syndiotactic poly(methyl methacrylate) in solution. Chen, W., Zhao, Y., Jiang, Y., Yan, D., Han, C.C. Chemphyschem : a European journal of chemical physics and physical chemistry. (2004) [Pubmed]
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