MEASURENT OF BOUND WATER OF POLY (VINYL ALCOHOL) BY THE ULTRASONIC VELOCITY METHOD

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Other Title
  • 超音波によるポリビニルアルコール水溶液中の水和の測定

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Description

An apparatus for the measurement of sonic velocity in liquids was constructed. The measurement of the sonic velocity U in an aqueous solution of polyvinyl alcohol (PVA) was carried out in the temperature range 25°C to 80°C by the apparatus. The magnitude of thus obtained U was larger than the sonic velocity in ion-exchanged water U0 in the above temperature range. U and U0 increased with the temperature, giving a maximum which appeared at lower temperature for U than for U0. Assuming that the adiabatic compressibility of the bound water β2 is equal to that of the value teported by Shiio et al, and also assuming that β1, and β2 are independent of temperature, the amount of bound water ν2 was calculated according to the formula reported by Shiio et al. Under the above assumptions, the calculated value of ν2 appeared to decrease as the temperature rised. Since it has been known that the removal of the bound water by electrolyte ions is one of the main factors of salting out of aqueous hydrophilic polymers, above results may shed light on the coagula-tion of PVA. The authors pointed out previously that the molecular motion of PVA also gives an effect on the coagulation. Dehydration and other factors contributing to the coagulation of PVA must be taken into account for the clarification.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 36 (7), T288-T292, 1980

    The Society of Fiber Science and Technology, Japan

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