1990 Fiscal Year Final Research Report Summary
Study on Synthesis of Tailor-Made Block Copolymers Having Side Chains of Liquid Crystal and its Application to Recording Materials.
| Project/Area Number |
01850201
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子合成
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
ISONO Yoshinobu Nagaoka Univ. of Technology, Fac. of Engin., Associate Professor, 工学部, 助教授 (30135321)
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| Co-Investigator(Kenkyū-buntansha) |
MIYAKI Yoshiyuki Tosoh Corp., Dep. Scientific Meas., Senior Resercher, 主任研究員
HIGO Hirohito Tosoh Corp., Biotech. Res. Labo., Manager, 室長
SASAKI Hiroaki Tosoh Corp., Biotech. Res. Labo., Director, 所長
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| Project Period (FY) |
1989 – 1990
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| Keywords | Block Copolyemr / Poly (Aminostyrene / N, N-Dimethyl-4-Vinylphenetylamine / Poly (N, N-Dimethyl-4-Vinylphenethylamine) / Molecular Memory / Photocromism / Anionic Polymerization / Cross-Linking by Quarternization |
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| Research Abstract |
To obtain a molecular memory, one needs not only the conditions, easy isomerization of dye to metastable state in recording, suppression of thermal backward isomerization in keeping, and easy backward isomerization in deleting, but also high mechanical strength. For the purpose, it is desirable to use bifunctional die as cross-linker onto block copolymer having a component of high glass transition temperature. It was found that N, N-dimethyl-4-vinylphenethylamine (PTA) is an appropriate monomer for the present purpose. Preparation and purification of PTA monomer is not so difficult. PTA can be polymerized anionically in THF at 195K with cumyl potassium or cumyl cesium as an initiator. The obtained poly (PTA) has a narrow molecular weight distribution. A well defined diblock copolymer, poly (PTA-b-styrene) can be obtained, if PTA is polymerized prior to styrene. The glass transition temperature of poly (PTA) is 315K. A quarternization of the block copolymer with p, p'-bis (chloromethyl) azo-benzene (CAB) can be easily carried out in a membrane form. An isomerization of such incorporated CAB from trans to cis form can be made by irradiation of UV light. Thermal backward isomerization is negligible at room temperature but easy at a temperature higher than the glass transition temperature of poly (PTA). These facts allow us to make a molecular memory by the use of poly (PTA) and CAB.
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