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• W2017049998 abstract "Cloud-point techniques have been used to establish θ-conditions for polytetrahydrofuran in five mixtures of chlorobenzene and n-octane. The relation [η] = KθM0.50 was verified in each case and d in 〈r2〉0/dT derived from the values of Kθ. Light scattering measurements on one fraction in these media confirmed that the second virial coefficient was zero in each case, but high apparent molecular weights were manifested on account of the considerable preferential adsorption of chlorobenzene. The unperturbed radius of gyration increased with temperature, in conflict with the decrease found viscometrically and predicted theoretically. This effect appears to substantiate the recent proposition of Yamakawa that coil sizes measured by light scattering are likely to be considerably in error when excessive preferential adsorption prevails. Des techniques par points de louche ont été utilisées pour établir les conditions theta du polytetrahydrofuranne dans cinq mélanges de chlorobenzène et de n-octane. La relation [η] = KθM0.50 était vérifiée dans tous les cas et on a obtenu d ln 〈r2〉0/dT à partir des valeurs de Kθ. Des mesures de diffusion de la lumière, effectuées sur une fraction dans ces milieux, ont confirmé que le second coefficient du viriel était nul dans tous les cas, mais les masses moléculaires apparentes étaient élevées en raison de l'adsorption préférentielle considérable du chlorobenzène. Le rayon de giration non-perturbé croît avec la température alors qu'une décroissance était trouvée par viscosimétrie et prédite théoriquement. Cet effet renforce la récente proposition de Yamakawa selon laquelle la dimension des pelotes mesurée par diffusion de la lumière était probablement déterminée avec une erreur considérable lorsqu'il y avait une adsorption préférentielle excessive. Le tecniche cloud-point sono state usate per stabilire le condizioni theta per il politetraidrofurano in cinque miscele di clorobenzene e di n-ottano. La relazione [η] = KθM0.50 é stata verificata in ogni caso e d ln 〈r2〉0/dT é stata derivata dai valori di Kθ. Misure di light scattering su una frazione in questi mezzi hanno confermato che il secondo coefficiente del viriale era zero in ogni caso, ma si manifestavano alti pesi molecolari apparenti a causa del considerevole assorbimento preferenziale del clorobenzene. Il raggio imperturbato di girazione aumenta con la temperatura, in contrasto con la diminuzione che risulta da misure viscosimetriche e predetta anche teoricamente. Questo effetto sembra avvalorare la recente affermazione di Yamakawa che le grandezze dei coil ottenute con il light-scattering sono facilmente errate quando prevale un assorbimento preferenziale eccessivo. Um die Theta-Bedingungen für Polytetrahydrofuran in fünf Mischungen von Chlorbenzol und n-Octan zu ermitteln, wurden Trübungspunktbestimmungen durchgeführt. Die Beziehung [η] = KθM0.50 war in jedem Fall erfüllt, und aus den Werten von Kθ wurde d In 〈r2〉0/dT abgeleitet. Lichtstreuungsmessungen an einer Fraktion in diesen Medien bestätigen, daβ der zweite Virialkoeffizient in jedem Fall Null war; es wurden aber hohe scheinbare Molekulargewichte gefunden auf Grund der bevorzugten Adsorption von Chlorbenzol. Der ungestörte Trägheitsradius nimmt mit der Temperatur zu, im Widerspruch zu einer aus viskosimetrischen Messungen und theoretischen Überlegungen zu erwartenden Abnahme. Dieser Effekt scheint die kürzlich von Yamakawa gemachte Annahme zu beweisen, daβ die durch Lichtstreuung gemessenen Knäueldimensionen wahrscheinlich beträchtliche Fehler aufweisen, wenn eine besonders starke bevorzugte Adsorption vorherrscht." @default.
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• W2017049998 date "1970-08-01" @default.
• W2017049998 modified "2023-10-14" @default.
• W2017049998 title "Temperature coefficient of the unperturbed dimensions of polytetrahydrofuran" @default.
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• W2017049998 doi "https://doi.org/10.1016/0014-3057(70)90141-2" @default.
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