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Surface tension of tactic polyvinylalcohols in water-DMSO-solution

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Summary

Surface tension of solutions of syndio-, iso- and atactic polyvinylalcohols in water-dimethylsulfoxide have been measured. Syndiotactic PVA is surface active with short relaxation time, nucleation and growth of the surface chains is rate determining. Isotactic surface adsorption is controlled by uncoiling of the intramolecular bonded sidegroups. If tactic PVA's have almost the same tactic percentage, tactic sequence distribution is the controlling factor which of the kind of configuration becomes surface active. Mixtures of syndio-with atactic PVA show a minimum of surface tension caused by mutual intermolecular interaction of syndiotactic sequences. Ethyleneglycol added as monomer prototype only is surface active until 20% PVA content, PVA sequences thereafter are dominating within the surface.

Zusammenfassung

Es wurde die Oberflächenspannung von Lösungen von syndio-, iso- und ataktischen Polyvinylalkoholen in Wasser-Dimethylsulfoxid gemessen. Syndiotaktisches PVA ist oberflächenaktiv mit kurzer Relaxationszeit; Keimbildung und Wachstum der Ketten in der Oberfläche bestimmen die Geschwindigkeit der Adsorption. Isotaktische Oberflächenadsorption wird durch die Entknäuelung der intramolekular verknüpften Seitengruppen kontrolliert. Wenn taktische PVA's beinahe gleichen taktischen Prozentgehalt besitzen, entscheidet die Sequenzverteilung, welche Konfiguration oberflächenaktiv wird. Mischungen von syndio- mit ataktischem PVA zeigen ein Minimum der Oberflächenspannung verursacht durch gegenseitige, intermolekulare Wechselwirkung syndiotaktischer Sequenzen. Glykol als Prototyp des Monomeren zugefügt ist nur oberflächenaktiv bis zu 20% PVA Gehalt, danach dominieren die PVA-Sequenzen in der Oberfläche.

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Authors and Affiliations

  1. Fritz-Haber-Institut der Max- Planck- Gesellscbaft, Faradayweg 4-6, D-1000, Berlin 33

    S. Matsuzawa & K. Ueberreiter

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  1. S. Matsuzawa
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  2. K. Ueberreiter
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Matsuzawa, S., Ueberreiter, K. Surface tension of tactic polyvinylalcohols in water-DMSO-solution. Colloid & Polymer Sci 256, 490–493 (1978). https://doi.org/10.1007/BF01405374

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  • DOI: https://doi.org/10.1007/BF01405374

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