2003 Fiscal Year Final Research Report Summary
Flow-induced Structure of Strongly Correlated Polymer Blends
| Project/Area Number |
13031041
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
TAKAHASHI Yoshiaki Kyushu University, Department of Molecular and Material Science, Associate Professor, 総合理工学研究院, 助教授 (40188066)
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| Project Period (FY) |
2001 – 2003
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| Keywords | Multi-component systems / Flow-induced structure / Domain size / Break up process / Coalescence process / Size distribution / 合一の加速 |
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| Research Abstract |
Effects of component's viscosities of diblocks on the flow induced alignment of microdomains are examined. It was observed that block copolymer with components having almost the same viscosities are much difficult to be aligned by the flow.
Flow-induced structure of immiscible polyolefin blends are examined by flow-SANS measurements. It was observed that string-like phase can exist even at the steady states at low shear rates while those strings burst into small droplets at high shear rates. These observations can be explained by extremely small interfacial tension between chemically similar components.
Break up and coalescence process of domain structure in a immiscible polymer blends with the viscosity ratio close to one are examined. In the coalescence process, there exists shear rate region in which domain structure and resulting viscoelastic properties are well controlled by the flow, but the behavior cannot be explained by Doi-Ohta theory. In such shear rate region, reproducibility of the data for break-up process become poor and inconsistent with those for coalescence process.
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