ISSN:
0887-6266
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Translational diffusion and internal motion have been observed by dynamic light scattering of optically labeled single chains of polystyrene (PS) in a semidilute solution of poly(methyl methacrylate) and benzene for the case in which the dimension Rg of the PS chain is comparable to the correlation length of the matrix solution. The molecular weight Mw dependence of the hydrodynamic radius Rh is expressed as Rh ∼ Mw0.91, while Rh ∼ Mw0.54 in pure benzene. The average linewidth Γ for internal motions (KRg 〉 1) appears to depend on the magnitude K of the scattering vector approximately as Γ ∝ K4 at higher KRg ( 〉 1), in contrast with the fact that Γ ∝ K3 approximately for KRg 〉 1 in pure benzene. The scaling law for the K dependence of Γ does not hold in low-molecular-weight PS owing to the K dependence of Γ/K2 for KRg 〈 1.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/polb.1986.180240103
