1987 Fiscal Year Final Research Report Summary
Fundamental Studies on Thermotropic Cholesteric Liquid Cryatals of Cellulose Derivatives with Flexible Substituents.
| Project/Area Number |
61550662
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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
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| Research Institution | Kyoto University |
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Principal Investigator |
MIYAMOTA Takeaki Inst. Chem. Res., Kyoto Univ. Assoc. Prof., 化学研究所, 助教授 (60027050)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Hidematsu Inst. Chem. Tes., Kyoto Univ. Instructor, 化学研究所, 助手 (00027054)
ASDA Tadahiro Faculty of Eng., Kyoto univ. Assoc. Prof., 工学部, 助教授 (10025934)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Cellulose Derivatives / Thermotropic Mesophase Formation / Flexible Substituents / Hydrophobic alkyl Chains / コレステリック液晶 |
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| Research Abstract |
The purpose of this research project is to elucidate the effect of substituents on thermotropic behavior of cellulose derivatives. To this end, four series of derivatives were prepared: (i) cellulose ethers with polyethyleneoxy chains, (ii) tri-O-alkylcalluloses with alkyl substituents ranging form ethyl to decyl, (iii) cellulose triacylates from propionate to palmitate, and (iv) acylates fo hydroxyethyl cellulose(HEC). The thermal behavior was examined by polarizing microscope, X-ray diffraction, CD and DSC.
It was found that (i) an increase of the length of flexible substituents allowa all series of cellulose derivatives to assume thermotropic mesophases, (ii) hydrophilic polyethyleneoxy chains are more responsible for the thermotropic mesophase formation of cellulose derivatives than hydrophobic alkyl chains and (iii)the thermotropic mesophase formation strongly depends not only on the chemical structure of substituents but also on the type of linkage such as ether, ester and amide linkages by which the substituents are appended to cellulose backbone. The results on cholesteric mesophase properties were also discussed in terms ofthe structural nature of substituents.
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