| Determination of Specific Refractive Index Increment （dn/dc）_μ at a Constant Chemical Potential,for Solutions of Polymer in Mixed Solvents by the GPC Method |
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| 作者姓名： | WANG Qing-guo LI Xiao-wen CHENG Rong-shi |
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| 作者单位： | WANG Qing-guo1，LI Xiao-wen1 and CHENG Rong-shi2 1.Department of Chemistry，Shenzhen University，Shenzhen 518060，P.R.China;2.Department of Chemistry，Nanjing University，Nanjing 210093，P.R.China |
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| 基金项目： | Supported by the National Natural Science Foundation of China(No.20474040). |
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| 摘 要： | A new chromatographic method is described for the determination of specific refractive index increment(dn/dc)μ at a constant chemical potential,for polymer/mixed solvent systems.In this method the(dn/dc)is obtained by measuring the areas of solvated-polymer peaks when the mixed solvent is used as an eluent.Values of(dn/dc)μ for the poly(dimethylsiloxane)(PDMS)-benzene-methanol system,determined by the proposed method are in good agreement with those determined by the conventional dialysis method.The new approach has the advantages of simplicity,fast speed,and high reproducibility.The experimental results for stearic acid-chloroform-methanol system show that this method can also be applied to nonpolymer/mixed solvent systems for the determination of(dn/dc)μ.
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| 关 键 词： | 折射增强 GPC 聚二甲基硅氧烷 硬脂酸 化学势 |
| 收稿时间： | 18 December 2006 |
| 修稿时间： | 2006-12-18 |
Determination of Specific Refractive Index Increment (dn/dc)μ at a Constant Chemical Potential, for Solutions of Polymer in Mixed Solvents by the GPC Method |
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| WANG Qing-guo LI Xiao-wen CHENG Rong-shi.Determination of Specific Refractive Index Increment (dn/dc)μ at a Constant Chemical Potential, for Solutions of Polymer in Mixed Solvents by the GPC Method[J].Chemical Research in Chinese University,2007,23(5):602-606. |
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| Authors: | WANG Qing-guo LI Xiao-wen CHENG Rong-shi |
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| Institution: | aDepartment of Chemistry, Shenzhen University, Shenzhen 518060, P. R. China;bDepartment of Chemistry, Nanjing University, Nanjing 210093, P. R. China |
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| Abstract: | A new chromatographic method is described for the determination of specific refractive index increment (dn/dc)ν at a constant chemical potential, for polymer/mixed solvent systems. In this method the (dn/dc) is obtained by measuring the areas of solvated-polymer peaks when the mixed solvent is used as an eluent. Values of (dn/dc)ν for the poly(dimethylsiloxane) (PDMS)-benzene-methanol system, determined by the proposed method are in good agreement with those determined by the conventional dialysis method. The new approach has the advantages of simplicity, fast speed, and high reproducibility. The experimental results for stearic acid-chloroform-methanol system show that this method can also be applied to nonpolymer/mixed solvent systems for the determination of (dn/dc)ν. |
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| Keywords: | Specific refractive index increment GPC Poly(dimethylsiloxane) Stearic acid |
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