放射線の空気中前照射によるリグニンのグラフト化
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概要
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Liginin is subject to easy radiation-peroxidation. In the case of pine hydrochloric acid lignin, irradiation of 1.92 Megarads of γ-ray in air gave rise to 3×10^<19> peroxide per gram of lignin. When the peroxidized lignin was allowed to stand in air, the peroxide contents diminished in 25 days to 40%, which was, thereafter, invariable for 250 days. when styrene or methyl methacrylate was used as monomer in the grafting there was reaction of 36 parts of styrene or of 39 parts of methyl methacrylate 100 parts of lignin, but it was not the case with ligninsulfonic acid. Up to 1.92 Megarads of dose amount applied, the peroxide concentration on lignin increased proportionally with the radiation period, but the grafting ratio indicated maximum value at the point of a peroxide content of 1.89×10^<19> per gram of lignin. When polystyrene branches propagated up to P^^-_n of 100, the corresponding grafting ratio reached to 35 in the radiation-peroxidation method and 200 in the case of direct radiation method respectively. This means that, in the case of radiation-peroxidation method, the number of active centers for grafting is one-sixth compared with those which appeared in the direct radiation grafting. From the so far known structure of lignin and the experimental results obtained here, it is to be concluded that the peroxides produced in the lignin molecules by pre-irradiation were mostly hydroperoxide arising from C-H scission at tertiary carbon, and less in diperoxide.
- 社団法人日本材料学会の論文
- 1967-10-15
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関連論文
- 照射域における紙の挙動 : (2)中性子放射化分析による紙の微量元素の決定, von Patek, P. and H. Soranthin, Das Papier,21, 179-183, 1967, 木質材料
- 照射域における紙の挙動 : (1)照射による包装紙の機械的性質の変化, von Sorantin, H. and A. Bardon, Das Papier, 21, 114-116, 1967 : 木質材料
- 木材ヘミセルロース化学の最近の問題点
- 放射線の空気中前照射によるリグニンのグラフト化
- キチン質と昆虫