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New class of dynamics in concentrated polymer gels.
Svanberg, C; Uematsu, T; Berntsen, P; Jacobsson, P.
Affiliation
  • Svanberg C; Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden. svanberg@fy.chalmers.se
J Chem Phys ; 126(5): 051103, 2007 Feb 07.
Article in En | MEDLINE | ID: mdl-17302464
We show that concentrated poly(methyl methacrylate) solution exhibits a new class of coupled dynamics, which can be regarded as an intermediate between the collective diffusion of solutions and the structural relaxations of glasses. This class of dynamics have a relaxation rate that is directly proportional to the wave vector. The transition from diffusive to coupled collective dynamics occurs at smaller length scales with increasing polymer concentration and decreasing temperature. The experimental observations can be understood by considering the contributions from physical cross-links interconnected by stiff polymer segments.
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Collection: 01-internacional Database: MEDLINE Language: En Journal: J Chem Phys Year: 2007 Document type: Article Affiliation country: Suecia Country of publication: Estados Unidos
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Collection: 01-internacional Database: MEDLINE Language: En Journal: J Chem Phys Year: 2007 Document type: Article Affiliation country: Suecia Country of publication: Estados Unidos