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Intramolecular concentration fluctuations

When q Rg > 1, concentration fluctuations within single macromolecules dominate the correlation tunction. The calculation ot the light-scattering correlation tunction S q,x) tor a single macromolecule in solution is described in detail in Berne and Pecora. The chain is modeled as shown in Equation 5.10. Intramolecular concentration fluctuations resolve into a set ot modes with characteristic relaxation times that depend on the subchain friction coefficient, the overall radius ot gyration, and the temperature. The correlation txmction can be expressed as ... [Pg.65]

The reaction described above can also be carried out at higher concentration whereby the probability of intramolecular reaction (cyclization) vanishes. So called chain extension processes result from the stoichiometric reaction of a "living" bifunctional precursors with an efficient bifunctional electrophilic deactivator. This polycondensation reaction induces a very large increase of the molecular weight, but is also results in an enhanced polydispersity. - Fractionation is necessary if well defined substances are required. However the average distance between successive hinges along the chain fluctuates only very little. [Pg.62]

See other pages where Intramolecular concentration fluctuations is mentioned: [Pg.519]    [Pg.17]    [Pg.370]    [Pg.73]    [Pg.319]    [Pg.118]    [Pg.9]    [Pg.259]    [Pg.140]    [Pg.102]    [Pg.103]    [Pg.34]    [Pg.377]    [Pg.139]    [Pg.221]    [Pg.116]    [Pg.17]    [Pg.59]    [Pg.109]    [Pg.34]   
See also in sourсe #XX -- [ Pg.65 ]



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Concentration fluctuations

Intramolecular concentration

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