Radius of Gyration of Polystyrene Combs and Centipedes in a O Solvent
The molecular weight dependence of the radii of gyration R{sub g} in a {var_theta} solvent (trans-decalin) of one regular branched comb and three regular centipede polystyrenes was studied using a gel permeation chromatography system equipped with a two-angle light scattering detector and a refracti...
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Published in | Macromolecules Vol. 38; no. 4 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
01.01.2005
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Subjects | |
Online Access | Get full text |
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Summary: | The molecular weight dependence of the radii of gyration R{sub g} in a {var_theta} solvent (trans-decalin) of one regular branched comb and three regular centipede polystyrenes was studied using a gel permeation chromatography system equipped with a two-angle light scattering detector and a refractive index detector. R{sub g} in trans-decalin for each sample of particular molecular weight was about 25% smaller than that in a good solvent (tetrahydrofuran, THF). On the other hand, they are 20--40% larger than the theoretical values from the Gaussian chain model. This difference can be explained with the wormlike comb model developed by Nakamura et al. (Macromolecules 2000, 33, 8323-8328). Persistence lengths thus obtained for each sample were about half of that determined in THF solution. However, they are significantly larger than that for linear polystyrene. These results suggest that a main chain stiffening effect exists in comb polystyrenes even in a {var_theta} solvent. |
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Bibliography: | DE-AC05-00OR22725 USDOE Office of Science (SC) |
ISSN: | 0024-9297 1520-5835 |
DOI: | 10.1021/ma049485s |