| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2017: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2016: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2015: ¥11,050,000 (Direct Cost: ¥8,500,000、Indirect Cost: ¥2,550,000)
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| Outline of Final Research Achievements |
Viscoelastic relaxation of polymers is insensitive to their chemical structure and thus universal under shear, but this universality vanishes under elongation. This study conducted elongational rheological measurements for model polymers having a polystyrene (PS) backbone but with various side groups at the para position of the phenyl group of PS, thereby investigating this breakdown of the universality. It turned out that a larger side group weakens the inter-chain orientational correlation to suppress reduction of the segmental friction of oriented/stretched chains (thereby breaking the universality) and that this friction reduction is not uniquely determine by the stress reflecting the chain conformation at each moment but exhibits retardation possibly due to retarded adjustment of orientation/stretch to the environment.
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