Dynamic Structure of Interacting Spherical Polymer Brushes

Langmuir

Volumn 15, Issue 2, 1999, Pages 358-368

  Semenov, A N ^a   Vlassopoulos, D ^b   Fytas, G ^b   Vlachos, G ^b   Fleischer, G ^c   Roovers, J ^d  

^a UNIVERSITY OF LEEDS   (United Kingdom)

^b INSTITUTE OF ELECTRONIC STRUCTURE AND LASER   (Greece)

^c UNIVERSITY OF LEIPZIG   (Germany)

^d NATIONAL RESEARCH COUNCIL CANADA   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

COLLOIDS; DIFFUSION; LIGHT SCATTERING; MOLECULAR DYNAMICS; MOLECULAR STRUCTURE; MONOMERS; MORPHOLOGY; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; RELAXATION PROCESSES;

MEAN FIELD SCALING THEORY; POLYDISPERSITY; POLYMER BRUSHES;

POLYMERS;

EID: 0032784905     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la980794j     Document Type: Article

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38. The core region is excluded in eq 8 because its structure is robust, i.e., independent of the semidilute concentration φ; hence this region gives a constant contribution to the free energy which is simply proportional to the number of stars.
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46. It is further noted that, throughout the wide range of concentrations (extending up to about 50c*, i.e., well into the semidilute regime), and for all different multiarm stars studied in this work, no evidence of ultraslow clusterlike relaxation process was found. This contradicts the recent study of Stellbrink et al. (Stellbrink, J.; Allgaier, J.; Richter, D, Phys. Rev. E 1997, 56, R3772) who reported such an ultraslow mode in polyisoprene stars of much lower functionality (f= 18) above c*. They associated this mode to a kind of structural lass transition, but on the other hand, they apparently did not find any evidence of self-diffusive or structural relaxation