EQUILIBRIUM MORPHOLOGY OF BLOCK COPOLYMER MELTS
EQUILIBRIUM MORPHOLOGY OF BLOCK COPOLYMER MELTS
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DOI：
10.1021/ma00164a028
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发表时间：
1986-10-01
期刊：
影响因子：
5.5
通讯作者：
KAWASAKI, K
中科院分区：
文献类型：
--
作者：
OHTA, T;KAWASAKI, K
结论有许多例子中，两种分析技术已经结合起来，以获得信息的分子大小分布和化学组成参数。这些组合主要用于共聚物研究。在某些情况下，SEC方法与一些其他分离方法结合使用，包括薄层色谱法、液相色谱法、甚至使用其他溶剂的SEC。13此外，SEC已与检测器系统相结合，产生一个以上的信息通道，包括顺序成对的不同检测器14和多波长二极管阵列检测器。本研究的结果表明，热FFF具有进入这种稳定的组合技术的非常好的资格。在许多方面，热FFF代表与SEC的理想组合，因为热FFF保留被干净地分为两个因素，一个代表控制SEC保留的相同分子尺寸效应，另一个代表化学组成效应。此外，组合物的影响似乎是显著的。我们的实验室正在做进一步的工作，以确定这一趋势适用于更广泛的聚合物系列。一种热FFF过程也可能与另一种使用不同载体溶剂的过程相结合。与使用两种溶剂的两个SEC过程的组合不同，使用热FFF对不会冒麻烦的吸附效应的风险。然而，同样，这种方法的可行性无法评估
Conclusions There are many examples in which two analytical techniques have been combined in order to acquire in-formation both on molecular-size distribution and on chemical composition parameters. These combinations have been used primarily in copolymer studies. In some cases an SEC procedure is used in combination with some other separation process, including thin-layer chromatog-raphy, 11 liquid chromatography, 12 or even SEC with an-other solvent. 13 Also, SEC has been combined with de-tector systems yielding more than one channel of infor-mation, including sequential pairs of unlike detectors14 and multiwavelength diode array detectors. 15 The results of this study show that thermal FFF has very good qualifications for entering this stable of com-bined techniques. In many ways thermal FFF represents an ideal combination with SEC because thermal FFF re-tention is cleanly dividedinto twofactors, one representing the same molecular-size effects that control retention in SEC, and the other representing chemical composition effects. Furthermore, the composition effects appear to be pronounced. Further work is being done in our labo-ratory toestablish this trend for a wider variety of polymer families.The possibility also exists that one thermal FFF pro-cedure could be combined with another using a different carrier solvent. Unlike the combination of twoSEC pro-cedures using two solvents, one would not risk troublesome adsorption effects with the thermal FFF pair. However, again, the feasibility of thisapproach cannot be evaluated