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- W2003180571 abstract "Two series of well characterized styrene-isoprene two-block copolymers have been synthesized, with weight fractions 50 and 75 per cent styrene. Their intrinsic viscosities have been studied in a number of solvents and over a wide range of molecular weights. In general the intrinsic viscosities are close to the weighted average of the corresponding homopolymers of equal molecular weight. There is discussion of the implications of these results with regard to the configuration of block copolymers in solution. On a effectuè la synthèse de deux séries de copolymères séquencés styrène-isoprène bien caractérisés, comportant 50 et 75 pour cent en poids de styrène. On a étudié leurs viscosités intrinsèques dans différents solvants et dans un large domaine de poids moléculaires. En général, les viscosités intrinsèques sont près de la moyenne pondérée des homopolymères correspondants, de poids moléculaire équivalent. On discute les conséquences de ces résultats sur la configuration des copolymères séquencés en solution. Si sono sintetizzati due serie di ben caratterizzati copolimeri a due blocchi di stireneisoprene con percentuale in peso di stirene del 50 e 75. Si è studiata la loro viscosità intrinseca in diversi solventi e per una larga gamma di pesi molecolari. In generale, la viscosità intrinseca trovata è prossima alla media ponderata dei corrispondenti omopolimeridieguale peso molecolare. Si discutono le implicazioni di tali risultati per quanto riguarda la configurazione in soluzione di copolimeri in blocco. Es wurden zwei Serien gut charakterisierter Styrol-Isopren Zwei Blockcopolymerer synthetisiert mit Gewichtsanteilen von 50% und 75% Styrol. Ihre Viskositätszahlen wurden über einen weiten Molekulargewichtsbereich in einer Anzahl von Lösungsmitteln untersucht. Im allgemeinen sind die Viskositätszahlen nahe an dem Gewichtsdurchschnitt des entsprechenden Homopolymeren mit gleichem Molekulargewicht. Die Bedeutung dieser Ergebnisse wird diskutiert im Hinblick auf die Konfiguration von Block Copolymeren in Lösung." @default.
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- W2003180571 date "1972-07-01" @default.
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- W2003180571 title "Solution properties of isoprene-styrene block copolymers" @default.
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- W2003180571 doi "https://doi.org/10.1016/0014-3057(72)90050-x" @default.
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