Ultraslow relaxation and hidden phase transition behavior of ultrathin glassy polymers.
| Project/Area Number |
17K05617
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Biological physics/Chemical physics/Soft matter physics
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| Research Institution | Kwansei Gakuin University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 高分子 / 薄膜 / ガラス転移 / 緩和現象 / シンクロトロン放射光 / 緩和 / X線回折・散乱 / 相転移 / 過冷却液体 / アモルファス / 表面・界面 / エンタルピー緩和 / 高分子薄膜 / 過冷却液体・ガラス転移 / 超薄膜 / 表面・界面物性 / 高分子構造・物性 / 複雑系 |
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| Outline of Final Research Achievements |
For glass-forming polymers, surface morphology and thickness were precisely measured with surface-sensitive X-ray scattering techniques so as to detect phase transition behavior emerged on glass transition of ultrathin films. For semicrystalline polymers, details on crystallization of thin polymers from glassy state, e.g., surface morphology, crystallinity and surface/interface-induced preferred orientation were characterized at synchrotron radiation facility. Information obtained by X-ray are combined with that by atomic force microscopy so as to clarify some of the unsolved problems including slow relaxation peculiar to thin glassy layers. Followings are intensively studied: (1) Phase transition expected to be hidden beneath glass transition; (2) Relaxation in thickness of glass layers that is very different from relaxation in volume of glassy materials; (3) Novel ultrathin crystal engineering platform based on glassy thin films.
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| Academic Significance and Societal Importance of the Research Achievements |
研究成果の概要に記した項目（１）については今回の研究期間内に試料表面における電子密度関数の相関の温度変化についてのデータを得ることが出来たわけであるが、これは長年にわたり議論されてきたガラス転移の本質を理解するための一助となるものと期待される。（２）については分子間相互作用などが異なるタイプの高分子に調査対象を広げて緩和測定を行うことで、ガラスに対する、特に薄膜ガラスに対する我々の見解を部分的に改めざるを得ないと考えさせられるレベルの知見を得た。（３）についてはガラス化した薄膜の結晶化技術に大きな進展が見られ、長年未解明であったソフトマター結晶の構造解析に成功したということを記しておきたい。
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Report
(4 results)
Research Products
(30 results)
