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The phase structure and molecular dynamics in poly(styrene-b-isoprene) diblock copolymer
- Source :
- Journal of Non-Crystalline Solids. 356:582-588
- Publication Year :
- 2010
- Publisher :
- Elsevier BV, 2010.
-
Abstract
- Molecular dynamics of polyisoprene, polystyrene and poly(styrene-b-isoprene) diblock copolymer has been studied by means of broadband dielectric and magnetic resonance spectroscopies. The measurements of dielectric permittivity as well as NMR second moment, spin–lattice relaxation times T 1 and T 1 ρ in wide range of temperature were performed. It was found that the copolymer exhibits all motions observed in the neat components i.e., three motions connected with polyisoprene blocks (segmental, normal-mode and methyl group rotation) and one (segmental) related to polystyrene blocks. The mutual interaction between polystyrene and polyisoprene chains leads to stiffening of polyisoprene blocks and loosening of polystyrene structure. The polyisoprene segmental and normal-mode motions were analyzed in terms of the Havriliak–Negami model and Vogel–Fulcher–Tamman (VFT) relation. Based on NMR spin-diffusion experiment the size of polystyrene domains in copolymer was evaluated and accounts to 9 nm.
- Subjects :
- Materials science
Relaxation (NMR)
Spin–lattice relaxation
Dielectric
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Styrene
chemistry.chemical_compound
chemistry
Phase (matter)
Polymer chemistry
Materials Chemistry
Ceramics and Composites
Copolymer
Physical chemistry
Polystyrene
Glass transition
Subjects
Details
- ISSN :
- 00223093
- Volume :
- 356
- Database :
- OpenAIRE
- Journal :
- Journal of Non-Crystalline Solids
- Accession number :
- edsair.doi...........d1986bf83f7043ad8d4ec0ecd61611ae