Investigation of transition phenomena of polymers in dilute solutions by gel permeation chromatography

Block copolymers poly(methy1 methacrylate)-block-polystyrene-block-poly(methyl methacrylate) and polystyrene-block-poly(tert-butyl methacrylate) were prepared by anionic polymerization and were studied in dilute solution as well as in the bulk state. The viscometric study revealed that the block copolymers exhibit a conformational "transition" occurring in a narrow temperature range. Films were obtained with the same copolymers by casting at different temperatures, chosen below and above the "transition". From the investigation of these f i i s by differential scanning calorimetry, using the entropy relaxation method, and by dynamic mechanical measurements, it was shown that the block copolymers exhibit a rather segregated structure if they are obtained below the "transition" temperature, and that they adopt a quasi-Gaussian conformation (implying a better miscibility of the two kinds of blocks) if the solvent is evaporated above the "transition" temperature.

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An indirect GPC calibration method for the low‐molecular‐weight region

Tsitsilianis

Mitsiani

Dondos

1989

J Polym Sci B Polym Phys

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A new gel permeation chromatography indirect calibration method is proposed for a polymer for which samples of known molecular weight and narrow molecular weight distribution are not available. This method is based on conversion of an experimentally obtained calibration curve for another polymer (polymer standard) through the universal calibration concept but using a new intrinsic viscosity‐molecular weight relation. This indirect calibration curve is proposed especially for the low‐molecular‐weight region, where the method based on the Mark‐Houwink‐Sakurada equation gives erroneous results.

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Investigation of transition phenomena of polymers in dilute solutions by gel permeation chromatography

Cited by 7 publications

References 11 publications

Transition phenomena of polystyrene in 1,1,2‐trichloroethylene/cyclohexane binary mixture

Transition phenomena of polystyrene in 1,1,2‐trichloroethylene/cyclohexane binary mixture

Conformational transition of block copolymers in dilute solution and their morphology in the solid state

An indirect GPC calibration method for the low‐molecular‐weight region

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