Shear-rate dependence of first normal stress difference of poly(isoprene-b-styrene) in solution near the order—disorder transition temperature
✍ Scribed by Yoshiaki Takahashi; Masahiro Noda; Nobuo Ochiai; Ichiro Noda
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 357 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0032-3861
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✦ Synopsis
Viscoelastic
properties of poly(isoprene-b-styrene) in dioctylphthalate under steady shear flow were measured near the order-disorder transition temperature. In ordered states, first normal stress difference N, is proportional to shear rate + at low r region, but becomes proportional to +2 at the high q region, similar to the N1 behaviour of polymer blends undergoing shear-induced homogenization. Because the existence of microdomains was confirmed at the high 3 region by the flow birefringence method, it is concluded that the above N, behaviour is not caused by shear-induced homogenization, but is probably caused by the shearinduced alignment of the microdomain structure.