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Molecular Rheology Lab
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The lab produces highly heat-resistant polymer films with deliberately different structures and measures those structures.
AboutAbout the lab
Understanding material properties from the higher-order structure of polymers.
The Molecular Rheology Lab (Ishige Lab) combines methods for controlling the higher-order structure of polymers by exploiting self-assembly, such as liquid crystals and microphase separation, with precise structural analysis methods, aiming to clarify the relationship between polymer structure and properties.
The main targets are rigid-rod polymers, which have extremely high heat resistance and are expected to serve as high-performance film materials.
Key terms
- Rigid-rod polymer
- A polymer with an aromatic backbone that does not bend easily. It is resistant to heat
- Precursor
- A substance one step before the target substance, which turns into it when heat or similar is applied
- Liquid crystal
- A state in which molecules flow like a liquid while being aligned to some degree
NewsLab news
A paper by Professor Ishige and colleagues was published in Macromolecules
A paper by Professor Ishige and colleagues was published in Polymer
ResearchResearch themes
The lab deepens understanding of the structures and properties unique to polymers by putting into practice a cycle of "molecular design and synthesis based on understanding of higher-order structure" → "structural analysis and property measurement" → "molecular design."
*Illustrative imageAligning rigid-rod polymers using liquid crystals
The lab focuses on precursors that show self-assembly such as liquid crystal phases at room temperature and turn into rigid-rod polymers when heated. By forming films while controlling the alignment and then baking them, the lab freely produces rigid-rod polymer films with liquid-crystal-like structures.
*Illustrative imageSolving structures with X-ray scattering
For synthetic polymers that do not yield single crystals, the lab uses various X-ray scattering methods to determine the shape of molecules within loosely ordered structures such as liquid crystals and highly disordered crystals. It also conducts experiments at synchrotron radiation facilities.
*Illustrative imageMeasuring orientation with polarized infrared spectroscopy
Using infrared spectroscopy with polarized light, the lab precisely evaluates molecular orientation in thin films. It also routinely performs vibrational calculations by density functional theory, which are needed to interpret the spectra.
*Illustrative imageReading data with statistical analysis
The lab also develops analysis methods (chemometrics) that use statistical analyses such as principal component analysis to extract interpretable information from huge sets of spectra and two-dimensional images measured at different temperatures and positions.
MembersFaculty
- ProfessorRyohei Ishige
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Kapton tapes, three rolls of different widths” Dsimic / CC BY-SA 3.0 (cropped)
- Aligning rigid-rod polymers using liquid crystals: “Liquid Crystal Art-2” Ingo Dierking / CC BY-SA 4.0 (cropped)
- Solving structures with X-ray scattering: “GISAXS” Smilgies / Public domain (cropped)
- Measuring orientation with polarized infrared spectroscopy: “FTIR 3000 1” Kkmurray / CC BY-SA 3.0 (cropped)
- Reading data with statistical analysis: “Hyperspectral image of a copolymer blend” Iban Amenabar / CC BY 4.0 (cropped)
- Related lab (Functional Materials Design Lab): “VO2 crystal” Ding-Shyue Yang, Peter Baum, and Ahmed H. Zewail / CC BY 4.0 (cropped)
- Related lab (Inorganic Structural Chemistry Lab): “Laser glass sculpture caffeine molecule” E. Goodman / Public domain (cropped)
- Related lab (Applied Solid State Chemistry Lab): “British Museum The Lycurgus Cup” Vassil / CC0 (cropped)
- Related lab (Organic Reaction Chemistry Lab): “WorkingAtFumeHood” Walkerma / CC BY-SA 3.0 (cropped)
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