| 乙醇-苯乙烯体系的辐解及α-羟乙基自由基反应动力学 |
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| 引用本文： | 张旭家,吴季兰,哈鸿飞. 乙醇-苯乙烯体系的辐解及α-羟乙基自由基反应动力学[J]. 物理化学学报, 1990, 6(3): 298-302. DOI: 10.3866/PKU.WHXB19900309 |
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| 作者姓名： | 张旭家 吴季兰 哈鸿飞 |
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| 作者单位： | Department of Technical Physics, Peking University |
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| 摘 要： | γ射线辐照乙醇, 通过苯乙烯抑制其辐解产物的研究, 证明在乙醇介质中α-羟乙基自由基只进行重合反应, 而无歧化反应; 苯乙烯可与α-羟乙基自由基反应, 其竞争反应为Sl+CH_3 CHOH→P 2CH_3CHOH→(CH_3CHOH)_2求得动力学方程为G'=G_0 k_6/2(k_7) 1/2 (G'/Dk')[Sl] G_0为纯乙醇γ射线辐照时2、3-丁二醇的产额, G_0=2.1, k_6/(k7)~(1/2)=0.53. 假定k_7为扩散反应速率常数, 则α-羟乙基自由基与丰乙烯加成反应的速率常数为k_6=4.0×10~4 L·mol~(-1)·s~(-1).
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| 关 键 词： | 乙醇 苯乙烯 辐解 羟乙基自由基 |
| 收稿时间： | 1988-09-21 |
| 修稿时间： | 1989-04-01 |
The Kinetics of α-Hydroxyethyl Radical in the Radiolysis of Ethanol-Styrene System |
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| Zhang Xu-Jia,Wu Ji-Lan,Ha Hong-Fei. The Kinetics of α-Hydroxyethyl Radical in the Radiolysis of Ethanol-Styrene System[J]. Acta Physico-Chimica Sinica, 1990, 6(3): 298-302. DOI: 10.3866/PKU.WHXB19900309 |
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| Authors: | Zhang Xu-Jia Wu Ji-Lan Ha Hong-Fei |
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| Affiliation: | Department of Technical Physics, Peking University |
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| Abstract: | The variations of the G value of the major products (H_2, CH_3CHO, (CH_3CHOH)_2) of the γ-radiolysis of liquid ethanol with the dose absorbed by the ethanol have been measured. The kineties of α-hydroxyethyl radical reacted with styrene in the ethanol-styrene system has been investigated.St+CH_3CHOH→P2CH_3CHOH→(CH_3CHOH)_2The kinetic equation has been derived asG'=G_0 k_6/2(k_7) 1/2 (G'/Dk')[Sl] and we got K_6=4.0×10~4 L·mol~(-1)·s~(-1). The disproportionation of α-hydroxyethyl radical scarcely occurs and acetaldehyde may come from the fast processes in spur. |
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