Separation method of responses from large scale motions and polymer chain motions are investigated for viscoelastic properties of symmetric poly(styrene-b-2-vinylpyridine)s (SP) in the ordered state taking into account of the effects of flow history on the sample. Due to the almost same thermo-rheological properties of components, master curves of dynamic moduli for SP, G*SP are obtained and shown that the data well coincide with those of polystyrene homopolymers (hPS) at high frequency ω , while responses from large scale motions of lamellar structure, δG*grain are observed at low ω, which asymptote to δG*grain ~ ω0.5. After the pre-shear, magnitude ofδG*grain became lower at the lower region. When the magnitude of G*SPare appropriately higher than δG*grain extended to higher ω, δG*grainand the responses of polymer chains, δG*chain, having Rouse like modes, are successfully obtained by subtraction, δG*chain = G*SP - δG*grain, irrespective of pre-shear. By combining thus obtained δG*grain, δG*chain, and the data for hPS, G*hPS at higher ω region, G*SP data can be well approximated in a whole frequency range of the measurement.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering