| 纤维素微球的分子质量及其分布 |
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| 引用本文： | 王则奋,黄科林,王犇,吴睿,陶靖,彭小玉,廖丹葵.纤维素微球的分子质量及其分布[J].安徽农业科学,2012(7):3840-3841,3848. |
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| 作者姓名： | 王则奋 黄科林 王犇 吴睿 陶靖 彭小玉 廖丹葵 |
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| 作者单位： | 广西大学化学与化工学院,广西南宁,530004;中国科技开发院广西分院,广西南宁,530022;广西化工研究院,广西南宁,530001;广西弦耀科技有限公司,广西南宁,530006;广西民族大学化学与生态工程学院,广西南宁,530006 |
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| 基金项目： | 广西自然科学基金资助项目 |
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| 摘 要： | 目的]采用黏度法和凝胶渗透色谱法(GPC)测定纤维素和纤维素微球的分子质量,为研究纤维素微球的结构和性能关系提供基础数据。方法]黏度法以镉乙二胺溶液为溶剂,通过乌式粘度计,25℃下测定溶液的特性粘数η来计算纤维素分子量;GPC法以8%的LiCl-N,N-二甲基乙酰胺(LiCl-DMAc)为溶剂,0.5%的LiCl/DMAc为流动相,测定纤维素和纤维素微球的相对分子质量及其分布。同时通过对测定结果的分析,对2种方法进行对比研究。结果]黏度法测定纤维素和纤维素微球的粘均分子量Mη分别为224 532和16 686;GPC测定纤维素和纤维素微球的重均分子量Mw分别为284 196和22 345。结论]GPC的测定结果较接近真实值,能够真实地反映纤维素和纤维素微球分子量分布的特性。
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| 关 键 词： | 纤维素微球 黏度法 凝胶渗透色谱法 分子量 分子量分布 |
Molecular Weight and Its Distribution of Cellulose and Cellulose Microspheres |
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| Institution: | WANG Ze-fen et al(School of Chemistry and Chemical Engineering,Guangxi University,Nanning,Guangxi 530004) |
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| Abstract: | Objective] This study aimed to provide basic data for studying the relationship between structure and property of cellulose microspheres by measuring molecular weight of cellulose and cellulose microspheres with viscosity method and gel permeation chromatography(GPC) method.Method] In viscosity method,cadmium ethylenediamine was used as the solvent,intrinsic viscosity η of the solution was determined at 25 ℃ by using a Ubbelohde viscometer,to calculate the molecular weight of cellulose;in GPC method,8% LiCl/N,N-dimethylacetamide(LiCl/DMAc) was used as the solvent and 0.5% LiCl/DMAc was used as the mobile phase to determine the relative molecular weight and distribution of cellulose and cellulose microspheres.In addition,the determination results were analyzed to compare these two methods.Result] Viscosity-average molecular weight Mη of cellulose and cellulose microspheres determined with viscosity method were 224 532 and 16 686,respectively;weight-average molecular weight Mw of cellulose and cellulose microspheres determined with GPC method were 284 196 and 22 345,respectively.Conclusion] The determination results of GPC method were relatively closer to the actual value and could truly reflect the characteristics of molecular weight distribution of cellulose and cellulose microspheres. |
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| Keywords: | Cellulose microspheres Viscosity method GPC method Molecular weight Molecular weight distribution |
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