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- W1529634902 abstract "UV absorption spectra of solutions of vinyl acetate polymers grafted on ethylene oxidepropylene oxide blockcopolymers in (90:10, v/v) ethanol/water mixture are investigated. The spectra of graft copolymers are clearly different from those of blends of the same composition. Conformational transitions of these copolymers occur in dilute solution at 35 and 60°C; the transitions are evidenced by UV differential spectra either compensated with solvent at the same temperature or with solution at 20°C. The absorbance measured at fixed wavelength as a function of temperature shows a change of slope at the transition points. However, the difference between the energies of solution and solvent as measured from differential spectra does not vary monotonously with temperature. It exhibits two minima corresponding to the transition temperatures. The plot of either this energy difference or the ratio of solvent maximum absorbance over solution maximum absorbance (from differential spectra) versus concentration allows to establish a critical concentration. Below this concentration a solution of grafted copolymers may be looked upon as dilute." @default.
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- W1529634902 date "1981-06-01" @default.
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- W1529634902 doi "https://doi.org/10.1002/macp.1981.021820613" @default.
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