Chromatographic investigations of macromolecules in the critical range of liquid chromatography, 5. Characterization of block copolymers of decyl and methyl methacrylate

Abstract

Block copolymers of decyl and methyl methacrylate were analyzed by liquid chromatography at the critical point of adsorption. The molar mass and the polydispersity of the decyl methacrylate block was determined using chromatographic conditions resulting in a critical mode for poly(methy1 methacrylate). In addition, using the same column system, the total molar mass and polydispersity of the block copolymers were determined, operating at chromatographic conditions insuring a size exclusion mechanism for both components.CCC 0025-1 16X/93/$05.00

Critical retention behaviour of polymers a study on the influence of some practical parameters

“…Other authors [9][10][11][12][13][14][15][16][17][18][19][20][21] have shown that chromatography under critical conditions is also applicable to block-copolymers. The interaction energies of chemically different blocks will mostly differ significantly.…”

“…Especially when chromatography under critical conditions is combined with size-exclusion chromatography (SEC), information about the distribution of endgroups in relation to the molecular-mass distribution can be obtained [2][3][4][5][6][7][8]. It has also been shown that under critical conditions, block-copolymers can be characterized with respect to their block length-distribution [9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Hyphenated Techniques in Liquid Chromatography of Polymers

“…LC-CC has been successfully used for the determination of the functionality type distribution of telechelics and macromonomers [104][105][106][107][108][109], for the analysis of block copolymers [111][112][113][114], macrocyclic polymers [115], and polymer blends [116][117][118].…”

Characterization of EO‐PO Block Copolymers by Liquid Chromatography Under Critical Conditions

“…Depending of the corresponding interaction parameter, this separation may follow a SEC [15][16][17] or LAC [18][19][20] mechanism. In the case of triblock copolymers, the influence of architecture has to be taken into account [21][22][23][24][25][26] : while the triblock A-B-A behaves like the diblock A-B at the CAP for A, the B-A-B triblock shows a very different pattern.…”