| 气相渗透法测定数均分子量的仪器常数问题研究 |
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| 引用本文： | 王治流,程镕时.气相渗透法测定数均分子量的仪器常数问题研究[J].高等学校化学学报,1998,19(9):1522-1525. |
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| 作者姓名： | 王治流 程镕时 |
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| 作者单位： | 南京大学化学化工学院高分子科学与工程系, 南京, 210093 |
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| 摘 要： | 用4个低分子量有机化合物和6个窄分布聚苯乙烯标样研究了VPO法中仪器常数K的分子量依赖性问题.实验结果表明,由于VPO法中存在溶质吸附效应,K具有分子量依赖性,并随分子量的增加而增大;当扣除在实验中产生的溶质分子吸附效应后,K无分子量依赖性.
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| 关 键 词： | 气相渗透法 数均分子量 仪器常数 吸附效应 |
| 收稿时间： | 1997-10-29 |
Studies on the Problem About the Instrumental Constant in Vapour Pressure Osmometry |
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| WANG Zhi-Liu,CHENG Rong-Shi.Studies on the Problem About the Instrumental Constant in Vapour Pressure Osmometry[J].Chemical Research In Chinese Universities,1998,19(9):1522-1525. |
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| Authors: | WANG Zhi-Liu CHENG Rong-Shi |
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| Institution: | Department of Polymer Science and Engineering, College of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093 |
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| Abstract: | The problem about the molecular weight dependence of the instrumental constant K of vapor pressure osmometry was studied in Knauer VPO apparatus by using four low molecular weight organic compounds and six narrow molecular weight distribution oligometic polystyrene samples with the known average molecular weights. There exists the effect of solute adsorption in VPO, which leads to the result that the instrumental constant K is apparently dependent upon the molecular weight of the solute. The dependence of the K on the molecular weight of the solute was eliminated by modifying a factor of solute adsorption. |
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| Keywords: | Vapor pressure osmometry Number average molecular weight Instrumental constant Adsorption effect (Ed : H L) |
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