A Separation Method of Responses from Large Scale Motions and Chain Relaxations for Viscoelastic Properties of Symmetric Poly(styrene-b-2-vinylpyridine)s in the Ordered State

作者：Fang Long; Takahashi Yoshiaki^*; Takano Atsushi; Matsushita Yushu

来源：Nihon Reoroji Gakkaishi, 2013, 41(2): 93-99.

DOI：10.1678/rheology.41.93

• Poly(styrene-b-2-vinylpyridine)
• Dynamic viscoelastic properties
• Large scale response
• Chain relaxation
• Lamellar structure

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 omega, while responses from large scale motions of lamellar structure, Delta G*(grain) are observed at low omega, which asymptote to Delta G*(grain) similar to omega(0.5). After the pre-shear, magnitude of Delta G*(grain) became lower at the lower omega region. When the magnitude of G*(SP) are appropriately higher than Delta G*(grain) extended to higher omega, Delta G*(grain) and the responses of polymer chains, Delta G*(grain) having Rouse like modes, are successfully obtained by subtraction, Delta G*(chain) = G*(SP) - Delta G*(grain), irrespective of pre-shear. By combining thus obtained Delta G*(grain), Delta G*(chain), and the data for hPS, G*(hPS) at higher omega region, G*(SP) data can be well approximated in a whole frequency range of the measurement.

• 出版日期2013