Gradient high performance liquid chromatography of polymers, 2. Characterization of block copolymers of decyl and methyl methacrylate synthesized via group transfer polymerization

Abstract

2151 Gradient high performance liquid chromatography of polymers, za) Characterization of block copolymers of decyl and methyl methacrylate synthesized via group transfer polymerization b, Dedicated to Prof. Dr. W Burchard on the occasion of his 60th birthday

ABC triblock polymethacrylates: Group transfer polymerization synthesis of the ABC, ACB, and BAC topological isomers and solution characterization

“…38 We have not performed such an analysis, but our aqueous GPC GPC studies in the last section of the paper lead to comparable conclusions in regard to the amount Figure 3 shows GPC chromatograms in THF of the three triblock copolymers (continuous lines), of impurities. It must be recognized that, although the percentage of impurities in the three polymers as well as those of the corresponding homopolymers (dotted lines) and diblock copolymer precurmay be similar, their chemistry is different.…”

“…The higher M n of polymer 3 compared to the theoretical is due to Each spectrum contains the backbone a methyl protons (b) in the range d 0.8-1.2 ppm with the decreased initiation efficiency which is always expected. 38 The matching of the M n of polymer 1 three peaks from upfield to downfield (i.e. from low to high ppms) corresponding to the syndiotacwith the theoretical MW is coincidental and due to a combination of decreased initiation efficiency tic, heterotactic, and isotactic configurations.…”

Characterization of low-molar-mass polymers by gradient polymer elution chromatography I. Practical parameters and applications of the analysis of polyester resins under reversed phase conditions

“…Under sorption conditions, retention depends on both chemical composition and molar mass. The applica-0021-9673/96/$15.00 © 1996 Elsevier Science BM All rights reserved PII SO0~ 1-9673(96)00361 -5 tion of chromatography under sorption conditions is especially useful for the characterization of copolymers according to their chemical composition distribution [3][4][5][6][7][8][9][10], the separation of polymer blends [l 1 -13] and for the fingerprinting of resins [14][15][16][17][18][19][20].…”

Microstructural characterization of aromatic copolyesters made by step reactions, by gradient polymer elution chromatography

“…5,6 For the determination of the CCD, especially gradient HPLC has been shown to be a versatile technique. After first being applied by Teramachi 7 the technique has been used by a (still rather limited) number of workers for the structural investigation of statistical copolymers 3,[7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] and, to a lesser extent, of block copolymers 26,27 and graft copolymers. 28 -34 A combination of at least two solvents is used, one of which is a chromatographically strong displacer and the amount of which is gradually increased in time.…”