1989 Fiscal Year Final Research Report Summary
Structure and Relaxation of Cellulose Derivatives
| Project/Area Number |
63560163
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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 |
林産学
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| Research Institution | Shizuoka University |
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Principal Investigator |
HIRAI Nobuyuki Shizuoka University, F.of Agriculture, Professor, 農学部, 教授 (70023439)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Yasunari The Institute of Physical and Chemical Research, Crystallography, Research Worke, 結晶学, 研究員 (70087401)
KAI Yuji Shizuoka University, F.of Agriculture, Professor, 農学部, 教授 (60022068)
TAKI Kinji Shizuoka University, F.of Agriculture, assistant Prof, 農学部, 助教授 (00022252)
SUZUKI Shigehiko Shizuoka University, F.of Agriculture, Instructor, 農学部, 助手 (40115449)
MARUYAMA Noriyoshi Shizuoka University, F.of Agriculture, Instructor, 農学部, 助手 (10022253)
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| Project Period (FY) |
1988 – 1989
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| Keywords | Relaxation of Cellulose Derivatives / Piezoelectric Materials / Cellulose Derivatives With Fluorine / Crystalline Dispersion of Cellulose / Crystalline Structure and NMR Spectrum |
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| Research Abstract |
The purpose of this research is to obtain new cellulose derivatives with high piezoelectric constants and investigate the elastic, dielectric and piezoelectric relaxations. The piezoelectric properties of cyanoethyl cellulose have been investigated. New cellulose derivatives with fluorine were synthesized. The piezoelectricity of them was investigated. The degree of crystallinity and orientation of the cellulose derivatives were very low. And so the piezoelectric constants of them were very low compared with that of cyanoethyl cellulose which was of the order of 10^<-13> C/N. But it may be considered that there is a possibility of development of high piezoelectric materials from cellulose derivatives by high orientation and crystallization of them. The relaxation behaviors of cellulose derivatives are investigated. Dispersions due to side chain in cellulose derivatives are studied about cellulose acetate, cellulose tosylate, cyanoethyl cellulose, PDAF-cyanoethyl cellulose, and PDAF-ethyl cellulose. There was a difference between cellulose triacetate and cellulose diacetate in local mode of side chain. There was observed the piezoelectric, dielectric and elastic temperature dispersions at about -30ﾟC in cellulose triacetate due to acetyl group, and at about -80ﾟC in cellulose diacetate due to methylol group. There were observed the primary dispersions of the piezoelectric, dielectric and elastic moduli in ethyl cellulose and cellulose acetate, at about 55ﾟC in ethyl cellulose, at about 100ﾟC in cellulose triacetate, and above 100ﾟC in cellulose diacetate. Because the cellulose derivatives were very low at the degree of crystallinity and orientation, we could not measure the temperature dependency of them. The temperature dependency of cellulose crystals was measured. There was an abrupt thermal expansion perpendicular to molecular chain in cellulose crystals above 200ﾟC. It may be considered that there is the temperature dispersion in cellulose crystals.
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