1999
DOI: 10.1021/ma981527n
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Liquid Adsorption Chromatography of Copolymers:  Molar Mass (In)dependent Retention

Abstract: Liquid adsorption chromatography with a continuous solvent gradient elution has been shown by several authors to often separate random and graft copolymers according to their chemical composition whereas their molar masses do not play an important role. A tentative explanation of this finding is presented. It is assumed that the copolymer species travel along the column with a velocity which exactly corresponds with that of the eluent composition, exhibiting a displacing power just necessary to prevent a fast … Show more

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Cited by 17 publications
(6 citation statements)
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“…The molar mass effects accompanying the FAD separation of statistical copolymers apparently contradict retention of copolymers when applying a continuous eluent gradient in LAC. As already mentioned, in the latter case, molar mass‐independent retention was many times observed in LAC,5–7 probably as a result of a presence of exclusion as the secondary mechanism within an LAC column 8. The best molar mass‐independent retention of copolymers in LAC was observed with the narrow pore packings 5, 6.…”
Section: Resultssupporting
confidence: 52%
See 1 more Smart Citation
“…The molar mass effects accompanying the FAD separation of statistical copolymers apparently contradict retention of copolymers when applying a continuous eluent gradient in LAC. As already mentioned, in the latter case, molar mass‐independent retention was many times observed in LAC,5–7 probably as a result of a presence of exclusion as the secondary mechanism within an LAC column 8. The best molar mass‐independent retention of copolymers in LAC was observed with the narrow pore packings 5, 6.…”
Section: Resultssupporting
confidence: 52%
“…In LAC, the experimental conditions can be identified for many copolymers, under which retention of macromolecules depends only on their composition but (practically) does not vary with their molar masses. The explanation of this phenomenon has been attempted recently considering exclusion effects within LAC column 8. In any case, the molar mass independent retention of statistical copolymers is a prerequisite for the straightforward two‐dimensional coupling of LAC with SEC.…”
Section: Introductionmentioning
confidence: 99%
“…Next, a gradient with increasing amount of desorbing liquid (desorli) is applied. Macromolecules start moving along the column and elute at retention volume, which depends on their chemical composition but not on their molar mass as far as they are excluded from the pores of the column packing 13. LAC was successfully applied to separation of numerous random copolymers6, 14 as well as graft copolymers 15–19.…”
Section: Introductionmentioning
confidence: 99%
“…As already mentioned, in the latter case, molar mass-independent retention was many times observed in LAC, [5][6][7] probably as a result of a presence of exclusion as the secondary mechanism within an LAC column. 8 The best molar mass-independent retention of copolymers in LAC was observed with the narrow pore packings. 5,6 On the contrary, exclusion of macromolecules is negligible from the nonporous packing of our FAD microcolumns, and therefore, it cannot cause any molar mass-independent retention.…”
Section: Resultsmentioning
confidence: 95%
“…The explanation of this phenomenon has been attempted recently considering exclusion effects within LAC column. 8 In any case, the molar mass independent retention of statistical copolymers is a prerequisite for the straightforward two-dimensional coupling of LAC with SEC. The fractions that leave an LAC column and contain macromolecules with narrow composition range but with different molar masses can be further separated according to their molecular size (molar mass) with help of SEC.…”
Section: Introductionmentioning
confidence: 99%