| Project/Area Number |
04453105
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子物性・高分子材料（含機械材料）
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| Research Institution | Nagoya University |
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Principal Investigator |
NODA Ichiro Nagoya U., Appl.Chem., Professor, 工学部, 教授 (30023055)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Yoshiaki Nagoya U., Appl.Chem., Assis.Prof., 工学部, 助手 (40188066)
MATSUSHITA Yushu Nagoya U., Appl.Chem., Assoc.Prof., 工学部, 助教授 (60157302)
DOI Masao Nagoya U., Appl.Phys., Professor, 工学部, 教授 (70087104)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1993: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1992: ¥5,900,000 (Direct Cost: ¥5,900,000)
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| Keywords | Viscoelastic properties / Polymer blends / Miscible state / Immiscible state / Newtonian fluid mixtures / Vicinity of phase separation / Textured materials / Shear-induced homogenization / ポリスチレン / ポリビニルメチルエーテル / textured material / スケーリング則 |
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| Research Abstract |
Viscoelastic properties of polymer blends were studied in 1) miscible and 2) immiscible states, and 3) a vicinity of phase separation as follows :
1) zero-shear viscosity etaﾟ and steady-state compliance J_e of polystirene/poly(vinyl methylether)(PS/PVME) blends in the miscible state were measures as functions of the molecular weight and composition of PS (M_<PS> and phi_<PS>) in the condition that M_<PS>>>M_<PVME> where M_<PVME> is the molecular weight of PVME.It was found that the etaﾟ of the polymeer blends in the semidilute region where phi_<PS><0.2, can be expressed by the same scaling law as semidilute polymer solutions, and the J_e almost agrees with that of polymer solutions. 2) Viscoelastic properties of silicone oil/liquid resin blends as a model of Newtonian fluid mixtures and polydimethylsiloxane/polybutadiene blends as a model of polymer blends were measured in the immiscible state. It was found that the shear stresses and normal stress differences of these blends are well explained by the theory of textured materials presented by Doi and Ohta, if the stresses of the component polymers are subtracted. 3) Viscoelastic properties of PS/PVME blends with the nearly critical compositions in steady-shear flow were studied in the vicinity of phase separation temperature. It was found that the shear rate dependences of viscosity eta and compliance J_s in the homogeneous region are almost the same as those of homopolymers, but the eta and J_s in the phase-separated region are enhanced at low shear rates and become consistent with those in the homogeneous region, when the shear rates are higher than their respective critical values, implying shear-induced homogenization.
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