| 13C NMR分析超临界CO2中合成的PAN的立构规整度 |
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| 引用本文： | 滕新荣,任杰. 13C NMR分析超临界CO2中合成的PAN的立构规整度[J]. 东华大学学报(自然科学版), 2005, 31(3): 1-4 |
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| 作者姓名： | 滕新荣 任杰 |
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| 作者单位： | 同济大学材料科学与工程学院,上海,200092 |
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| 基金项目： | 本项目得到上海纳米科学技术专项基金资助(编号0452nm059:0500236082) |
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| 摘 要： | 采用^13C NMR分析技术，将超临界CO2下AN沉淀聚合的立体特性(以下简称CO2-PAN)与AN水相沉淀自由基聚合及AN水相悬浮自由基聚合进行了比较，在五单元组立构序列的水平上讨论了超临界CO2中AN沉淀聚合的统计链增长模型。研究表明CO2-PAN的链增长过程符合Bernoulli统计模型，其立构规整性是完全无规的。并认为，与其他两种PAN相比，CO2-PAN等规立构规整度偏低的原因是由于所采用的CO2溶剂的非极性效应所致。
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| 关 键 词： | ^13C NMR 立构规整度 统计模型 聚丙烯腈 超临界CO2 |
| 修稿时间： | 2004-03-03 |
13C NMR Characteristic Tacticity of Polyacrylonitrile Produced in Supercritical CO2 |
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| TENG Xin-rong,REN Jie. 13C NMR Characteristic Tacticity of Polyacrylonitrile Produced in Supercritical CO2[J]. Journal of Donghua University, 2005, 31(3): 1-4 |
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| Authors: | TENG Xin-rong REN Jie |
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| Abstract: | Compared with the aqueous phase precipitation polymerization of AN and aqueous phase suspension polymerization of AN, The pentad tacticity of PAN obtained by precipitation polymerization in supercritical CO_2 was analyzed by ~ 13C NMR method. It was found that the CO_2PAN was completely random in stereoregularity, and the sequence distributions of it obeyed Bernoulli statistics. The reason for the isotacticity of CO_2PAN being lower than the other two kinds of PAN was probably due to the nonpolar property of solvent used. |
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| Keywords: | 13C NMR tacticity statistics method polyacrylonitrile supercritical CO_2 |
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