1993 Fiscal Year Final Research Report Summary
DEVELOPMENT OF QUASI-MICROSCOPIC TECHNIQUES FOR MOLECULAR FIBER/WIRE OF AROMATIC POLYIMIDES
| Project/Area Number |
04650816
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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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 | SHIZUOKA INSTITUTE OF SCIENCE AND TECHNOLOGY |
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Principal Investigator |
KOCHI Masakatsu SHIZUOKA INSTITUTE OF SCIENCE AND TECHNOLOGY.DEPARTMENT OF SCIENCE AND TECNNOLOGY.PROFESSOR, 理工学部, 教授 (90013705)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Molecular Fiber / Molecular Wire / Aromatic Polyimide / Monoaxial Drawing / Molecular Orientation / Absorption Dichroism |
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| Research Abstract |
1.The cold drawing of as-cast polyamic acid (PAA) film followed by thermal imidization and annealing under tension was very effective for improving the tensile mechanical properties of films of rigid and linear polyimides (PIs) because the orientation of the main chains is retained by the formation of ordered phases during imidization.
The swelling method was also an excellent technique. The drawing of swollen polyamic acid films can provide more draw ratio than the cold drawing method if mixed swelling solvents and temperatures are chosen properly.
The hot drawing methed was appropriate for polyimides of flexible main chains. Especially it was most effective for flexible PI(PMDA/3.4'-ODA) with a linear main chain in an extended conformation.
2.The absorption dichroism of perylenebisimide dye was applied to evaluate the monoaxial molecular orientation of PAA and PI as function of draw ratio of PAA films. The dichroic spectra showed that for rigid PI (BPDA/PDA) spontaneous molecular orientation occurs during thermal imidization of slightly drawn PAA(BPDA/PDA) filsm.
3.A new apparatue was prepared for spinning PAA fibers. The devel opment of molecular fiber and molecular wire of aromatic PIs are in progress using this apparatus and the drawing techniques for PI films.
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