ISSN:
0887-6266
Keywords:
solutions of homopolymer mixtures, dynamical relaxation properties of
;
solutions of copolymers dynamical relaxation properties of
;
mixtures of different polymers in solution, dynamical relaxation of
;
copolymers, nonsymmetrical, in solution, dynamical relaxation of
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Dynamical relaxation properties of nonsymmetrical mixtures of homopolymers and of copolymers in solution are examined. In particular, examples of bimodal mixtures in solution, ternary mixtures of two different homopolymers and a solvent, and nonsymmetrical diblock copolymers in solution are examined. The frequencies of the eigenmodes Γ and Γ′, those of the cooperative mode ΓT and the interdiffuse mode ΓI are calculated for these systems. It is found that the variations of TT and TI, with the scattering wave number q are practically identical to those of ΓT and ΓI, respectively. This identity is rigorous only for mixtures or copolymers where the two polymer components are identical except for their contrast factors (i.e., indices of refraction or scattering lengths). Here, it is argued that the identification of the eigenmodes with the cooperative and interdiffuse modes can be extended qualitatively to mixtures of different polymers and to nonsymmetrical copolymers in solution.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/polb.1992.090300711
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