Summary
Block copolymers of styrene andt-butyl methacrylate can be analysed by methanol/tetrahydrofuran gradients on C18 or phenyl bonded phase columns. On both of these columns, retention increases with styrene content of the samples. At 50°C, the retention of PS or a block copolymer containing 45% styrene was longer on the phenyl than the C18 columns. This indicates the contribution of adsorption to retention on phenyl bonded phase columns. Lowering the temperature from 50 to 30°C caused earlier elution of part of the sample from the phenyl phase. On a C18 phase the same drop in temperature improved the shape of the peak, which also started later than at 50°C. This effect of temperature is generally observed in polymer retention due to an adsorption mechanism, whereas increasing retention with decrease in temperature is characteristic of a precipitation mechanism.
The block copolymer investigated contained 15% free polystyrene precursor which could not be separated from the block copolymer under the conditions employed. The addition of 20% PS homopolymer with a molecular weight similar to that of the styrene block in the copolymer showed that the polystyrene eluted together with the block copolymer, whereas the addition of PS homopolymer with a much higher molecular weight caused an extra peak at the expected elution time.
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References
G. Glöckner, A.H.E. Müller, J. Appl. Polym. Sci.38, 1761 (1989).
S. Teramachi, A. Hasegawa, Y. Shima, M. Akatsuka, M. Nakajima, Macromolecules12, 992, (1979).
G. Glöckner, inSir Goeffrey Allen, ed. “Comprehensive Polymer Science”, vol. 1,C. Booth, C. Price eds., Pergamon, Oxford (1989), p. 313–327.
G. Glöckner, “Gradient HPLC of Copolymers and Chromatographic Cross-Fractionation”, Springer, Heidelberg (1991).
M.A. Quarry, M.A. Stadalius, T.H. Mourey, L.R. Snyder, J. Chromatogr.358, 1 (1989).
G. Glöckner, inH. G. Barth, ed., “Proc. First Internat. Symp. Polym. Analysis and Characterization, Toronto, 1988”, J. Appl. Polym. Sci., Appl. Polym. Symposia43, 39 (1989).
G. Glöckner, “Polymer Characterization by Liquid Chromatography”, Elsevier, Amsterdam (1987), chpt. 6.
S. Mori, Y. Uno, J. Appl. Polym. Sci.34, 2689 (1987).
S. Mori, M. Mouri, Analyt. Chem.61 2171 (1989).
H. Sato, H. Takeuchi, Y. Tanaka, Internat. Rubber Conference Kyoto, 596 [18B15] (1985).
M.A. Müller, M. Augenstein, E. Dupont, H. Pennewiß, New Polym. Materials2, 315 (1991).
S. Mori, J. Appl. Polym. Sci.38, 95 (1989).
G. Glöckner, in “Advances in Polym. Sci.”,G. Heublein, ed.79, 159, (1986).
G. Glöckner, unpublished results (1985).
S. Schmutzler, Diploma Project, Technische Universität Dresden (1988).
G. Glöckner, Chromatographia25, 854 (1988).
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Dedicated to Professor Leslie S. Ettre on the occasion of his 70th birthday.
Part I see Ref. [1].
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Glöckner, G., Wolf, D. Gradient high performance liquid chromatography of block copolymers of styrene andt-butyl methacrylate II. Association phenomena in mixtures of block copolymer with polystyrene. Chromatographia 34, 363–368 (1992). https://doi.org/10.1007/BF02268369
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DOI: https://doi.org/10.1007/BF02268369