1997 Fiscal Year Final Research Report Summary
Efficient Utilization of Ozonized Lignin
| Project/Area Number |
08556025
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
林産学
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| Research Institution | University of Tsukuba |
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Principal Investigator |
TOMITA Bunichiro University of Tsukuba, Institute of Agricultural and Forest Engineering, Professor, 農林工学系, 教授 (40012075)
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| Co-Investigator(Kenkyū-buntansha) |
KAJIYAMA Mikio University of Tokyo, Graduate School of Agricultural and Life Science, Research, 大学院・農学生命科学研究科, 助手 (40191978)
TAKEMURA Akio University of Tokyo, Graduate School of Agricultural and Life Science, Research, 大学院・農学生命科学研究科, 助手 (50183455)
OHI Hiroshi University of Tsukuba, Institute of Agricultural and Forest Engineering, Assista, 農林工学系, 講師 (20201965)
KURODA Kenichi University of Tsukuba, Institute of Agricultural and Forest Engineering, Profess, 農林工学系, 教授 (80015908)
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| Project Period (FY) |
1996 – 1997
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| Keywords | lignin / ozonization / water-soluble epoxy / viscoelastic property / glass transition / polymerization / resinification |
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| Research Abstract |
A new resin system was developed only by mixing the alkaline solution of industrial lignin or its ozonized products with water soluble epoxy compound, polyethylene glycol diglycidyl ether (PRGDGE), and curing reagent. The lignin/epoxy resins were synthesized by alternation the blend ratio or their chemical structure. The viscoelastic properties of cured resin films were investigated.
As the content of the kraft lignin in the resins increased, the absorption peak due to the glass transition for cured resins shifted to a higher temperature with spreading. It was found that the grass transition of cured resins can be modified by changing kinds of PEGDGE and curing reagents. Addition of the emulsion type of diglycidyl ether of bisphenol A (DGEBA) to the blendings also could make the grass transition temperature of cured resins higher. Since only one broad dispersion peak due to the grass transition could be observed, it was suggested that the cured resins had compatibility to form a kind of IPNs (Interpenetrating Polymer Networks).
The possibility of application of these resins to damping materials and adhesives was strongly suggested, since they had a large secondary relaxation peak at lower temperature. The effect of ozone-treatment on mechanical properties of cured resins was not obvious.
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