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Time dependence of viscosity of dilute polyisobutylene solutions

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Summary

Shearing at constant gradient of polyisobutylene (PIB) solutions in viscous polybutene oils results in time dependent changes of their viscosities. Two PIB fractions (M=8·106 and 3.8·106) have been studied in a variety of solvents, covering the viscosity range from 5 to 0.5·10−2 poise. The overall phenomenon is similar to that already observed for polymethylmethacrylate, polystyrene, and polyethylene oxide solutions in Aroclor.

Results have been discussed in terms of polymer molecular weight and concentration, solvent viscosity and gradient. The systems investigated are free from strong polar interactions and tendency toward molecular aggregation; time dependent changes of viscosity are therefore observable also for true molecularly dispersed solutions.

Zusammenfassung

Scherung mit konstantem Geschwindigkeitsgradienten von Polyisobutylen (PIB)-Lösungen in viskosen Polybuten-Ölen ergibt zeitabhängige Änderungen ihrer Viskositäten. Zwei PIB-Fraktionen (M=8·106 und 3,8·106) wurden in einer Vielzahl von Lösungsmitteln untersucht, die den Viskositätsbereich von 5 bis 0,5·10−2 Poise überdeckten. Das phänomenologische Erscheinungsbild ist ähnlich dem schon beobachteten für Polymethylmethacrylat, Polystyrol und Polyäthylenoxid-Lösungen in Aroclor.

Die Ergebnisse wurden hinsichtlich des Polymer-Molekulargewichts und der Konzentration, der Lösungsmittelviskosität und des Gradienten diskutiert. Die untersuchten Systeme sind frei von starken polaren Wechselwirkungen und von Tendenzen in Richtung auf molekulare Aggregation. Zeitabhängige Änderungen der Viskosität sind deshalb auch für wahre molekulardisperse Lösungen beobachtbar.

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Author notes

  1. A. Peterlin

    Present address: Camille Dreyfus Laboratory Research Triangle Institute, Research Triangle Park, N.C., USA

  2. U. Bianchi

    Present address: Istituto di Chimica Industriale, Università di Genova, Genova, Italy

Authors and Affiliations

  1. Camille Dreyfus Laboratory Research Triangle Institute, Research Triangle Park, N.C., USA

    U. Bianchi

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  1. U. Bianchi
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  2. A. Peterlin
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Bianchi, U., Peterlin, A. Time dependence of viscosity of dilute polyisobutylene solutions. Kolloid-Z.u.Z.Polymere 232, 749–752 (1969). https://doi.org/10.1007/BF01500649

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  • DOI: https://doi.org/10.1007/BF01500649

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