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- W2092022685 abstract "The hydrodynamic properties of para- and ortho-polycarbethoxyphenylmethacrylamides (p- and o-PCEPMA) showed that there was a number of anomalies in the hydrodynamic behaviour of p-PCEPMA in such solvents as ethyl acetate and dimethylformamide (DMF) [1, 2]. These anomalies were attributed to the development of structural rigidity in the macromolecules due to the possibility of hydrogen bonds forming inside the chains between the amide groups or amide hydrogen and carbonyl oxygen of the carbethoxy group. These anomalies disapppear when the p-PCEPMA is “denatured” in formamide. They do not occur in o-PCEPMA where it is impossible for internal hydrogen bonds to form due to the H bond being “closed” in each monomer unit. But the measurements do not provide a basis for any kind of conclusion regarding the probable shape of the p-PCEPMA macromolecules. Besides this, later work [3, 4] has thrown doubt on the existence of the anomaly. Eskin and Korotkina [3] who used light scattering to determine the molecular weights of the same fractions of p-PCEPMA as those in [2], found the normal viscosity law in ethyl acetate [η]=KηMa (the exponent having a constant value). Nikitina and Sharonova [4], who studied the IR absorption spectra of p-PCEPMA solutions in chloroform, came to the conclusion that only a very small number of the amide hydrogens participates in the formation of the internal H bonds. This rules out the formation of coiled macromolecules of p-PCEPMA, at least in chloroform, which was suggested as a possible interpretation of the anomaly. It is therefore necessary to supplement the data for the solutions in DMF by measurement of the sedimentation and diffusion constants in ethyl acetate made on the same fractions as those of [2] and [3]. By comparing the experimental data obtained by the four different methods, sedimentation, diffusion, viscometry and light scattering, additional light will be thrown on the hydrodynamic anomaly of p-PCEPMA." @default.
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- W2092022685 date "1964-01-01" @default.
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- W2092022685 title "Hydrodynamic properties of polycarbethoxyphenylmethacrylamide—III" @default.
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- W2092022685 doi "https://doi.org/10.1016/0032-3950(64)90069-3" @default.
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