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Fractionated end functional PS and PEO as well as their block copolymers by LCCC [35]. Various functional PS (a- and/or a, w-alcohol, acetal, aldehyde and carboxy) could be readily separated from non-functional PSs under various LCCC conditions (Fig. 31). Evreinov et al. fractionated four types of branched polyesters based on adipic acid, diethylene glycol and trimethylolpropane, pentaerythritol, or glycerol, or on diethylene glycol, dimethyl adipate, and trimethylolpropane with respect to functionality types (the number and type of end groups) using LCCC [36].

They showed that hydroxy group terminated PS could be fully resolved from normally terminated PS of identical molecular weight up to 100 kg/mol, which was impossible either with SEC or with RP-TGIC (Fig. 30). As mentioned briefly in Sect. 2, the analysis of functionality has been carried out extensively by LCCC method [9]. Adrian et al. analyzed bisphenol A based epoxy resins by SEC, LCCC and MALDI-TOF MS with respect to molar mass, functionality, and branching [34]. LCCC yielded quantitative data on different Recent Advances in Liquid Chromatography Analysis of Synthetic Polymers 49 Fig.

Ethyl acrylate rich copolymers exhibit significant deviations from the calculated values in particular for the ethyl acrylate homo-triads [146]. With the recent development of the polymerization techniques to prepare highly stereoregular polymers, there have been various efforts to isolate the tacticity distribution from other heterogeneity [172]. Different tactic polymers have slightly different hydrodynamic volumes but not large enough for SEC to distinguish the difference effectively [173, 174].

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Liquid Chromatography Ftir Microspectroscopy, Microwave Assisted Synthesis by Bhargava R.


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