| MECHANISM FOR THE INITIATION OF ACRYLONITRILE POLYMERIZATION BY POLYPROPYLENE-BASED POLYAMIDOXIME-THIOUREA COMBINATION |
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| 作者姓名： | 吴锦远 张广照 杨超雄 |
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| 作者单位： | Guangzhou Institute of Chemistry，Academia Sinica，Guangzhou，Guangzhou Institute of Chemistry，Academia Sinica，Guangzhou，Guangzhou Institute of Chemistry，Academia Sinica，Guangzhou |
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| 基金项目： | This project supported by the National Natural Science Foundation of China. |
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| 摘 要： | Polymerization of acrylonitrile (AN) in aqueous nitric acid initiated by polypropylene-based polyamidoxime (PPAO)-thiourea (TU) combination has been investigated. The overall rate of polymerization (R_p) under the conditions of TU]/PPAO]<0.5 molar ratio isThe molecular weights of the polymers were found to be inversely proportional to 3/2-power of nitric acid concentration and 1-power of thiourea concentration. In addition, it is independent with the concentrations of monomer and PPAO, and decreases with increasing temperature.On the basis of these experimental results, a coordination-proton transfer mechanism for the initiation was proposed and discussed.
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| 收稿时间： | 1991-04-02 |
MECHANISM FOR THE INITIATION OF ACRYLONITRILE POLYMERIZATION BY POLYPROPYLENE-BASED POLYAMIDOXIME-THIOUREA COMBINATION* |
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| WU Jinyuan,ZHANG Guangzhao,YANG Chaoxiong.MECHANISM FOR THE INITIATION OF ACRYLONITRILE POLYMERIZATION BY POLYPROPYLENE-BASED POLYAMIDOXIME-THIOUREA COMBINATION[J].Chinese Journal of Polymer Science,1992,0(1):61-69. |
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| Authors: | WU Jinyuan ZHANG Guangzhao YANG Chaoxiong |
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| Institution: | Guangzhou Institute of Chemistry; Academia Sinica; Guangzhou |
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| Abstract: | Polymerization of acrylonitrile (AN) in aqueous nitric acid initiated by polypropylene-based polyamidoxime (PPAO)-thiourea (TU) combination has been investigated. The overall rate of polymerization (R_p) under the conditions of TU]/PPAO]<0.5 molar ratio is
The molecular weights of the polymers were found to be inversely proportional to 3/2-power of nitric acid concentration and 1-power of thiourea concentration. In addition, it is independent with the concentrations of monomer and PPAO, and decreases with increasing temperature.
On the basis of these experimental results, a coordination-proton transfer mechanism for the initiation was proposed and discussed. |
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| Keywords: | Acrylonitrile Polymerization kinetics Polyamidoxime-thiourea combination Coordination-proton transfer mechanism |
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