| 聚对苯二甲酸乙二醇酯-聚四亚甲基醚多嵌段共聚物的交叉分级和体积排斥色谱 |
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| 引用本文： | 徐种德,袁平,钟景国,姜尔芳,吴美琰.聚对苯二甲酸乙二醇酯-聚四亚甲基醚多嵌段共聚物的交叉分级和体积排斥色谱[J].医学教育探索,1987(2). |
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| 作者姓名： | 徐种德 袁平 钟景国 姜尔芳 吴美琰 |
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| 作者单位： | 华东化工学院高分子材料系
(徐种德)，中国科技大学应用化学系
(袁平)，上海合成树脂研究所
(钟景国，姜尔芳)，中国科学院北京化学研究所(吴美琰) |
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| 摘 要： | 本文采用交叉分级法和体积排斥色谱法(SEC)分别测定了聚对苯二甲酸乙二醇酯-聚四亚甲基醚多嵌段共聚物(PET-PTMG)的分子量分布和组成分布,并对两种方法的结果进行了比较。讨论了PET-PTMG的交叉分级和体积排斥色谱规律。结果表明:当共聚物的各组成相容性很差时(例如PET-PTMG),交叉分级对组成分离起主要作用,而对分子量分离的效率较差;由SEC法测定共聚物的组成分布只是反映组成随分子量变化的情况,而不能代表真实的组成分布;PET-PTMG～氯仿体系并不符合SEC普适校正规律。
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| 关 键 词： | 聚对苯二甲酸乙二酯 聚醚 嵌段共聚物 高聚物表征 高分子溶液 分级 分子量分布 凝胶渗透色谱 |
Cross fractionation and size exclusion chromatography of poly(ethylene terephthalate)-poly-(tetramethylene ether) multiblock copolymer |
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| Xu Zhongde,Yuang Ping,Zhong Jingguo,Jiang Erfang,Wu Meiyan Dept. of Polymer Materials,East China University of Chemical Technology Dept. of Applied Chemistry,University of Science & Technology of China.Cross fractionation and size exclusion chromatography of poly(ethylene terephthalate)-poly-(tetramethylene ether) multiblock copolymer[J].Researches in Medical Education,1987(2). |
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| Authors: | Xu Zhongde Yuang Ping Zhong Jingguo Jiang Erfang Wu Meiyan Dept of Polymer Materials East China University of Chemical Technology Dept of Applied Chemistry University of Science & Technology of China |
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| Institution: | Xu Zhongde,Yuang Ping,Zhong Jingguo,Jiang Erfang,Wu Meiyan Dept. of Polymer Materials,East China University of Chemical Technology Dept. of Applied Chemistry,University of Science & Technology of China Shanghai Institute of Synthetic Resins Institute of C |
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| Abstract: | Poly(ethylene terephthalate)-Poly (tetramethylene ether) multiblock copolymer
sample was fractionated by cross fractionation using two different solvent/nonsolvent
systems. Eighteen fractions with different molecular weights and different chemical
compositions were obtained. These fractions were employed to study the solution
properties and characteristics of PET-PTMG copolymer.
The composition distribution and molecular weight distribution were constructed
from the cross fractionation data and SEC measurement. The comparison between the
results of two methods have been made. The behaviours of cross fractionation and SEC
of PET-PTMG have been discussed.
The findings are as follows:
1. Cross fractionation trends to separation according to composition for the copo-
lymer with highly incompatibility of components and can not deduce the true molecular
weight distribution.
2. SEC determination gives only information on the composition drift as function
of apparent molecular weight but not the true composition distribution.
3. The SEC universal calibration method is not applicable for PET-PTMG multi-
block copolymer in CHCl_3. |
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| Keywords: | Polyethylene terephthalate polyether block copolymer polymer characterization polymer solution fractionation molecular weight distribution gel permeation chromatography |
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