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聚丙烯酰胺水溶液的超声研究

冯若

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聚丙烯酰胺水溶液的超声研究

冯若

ULTRSONIC INVESTIGATION OF THE AQUEOUS SOLUTION OF POLYACRYLAMIDE

Feng Ruo
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  • 浓的聚丙烯酰胺水溶液的切变粘滞系数是如此之大,以致按经典声吸收理论超声振动在其中根本不能传播。但我们用11.4兆赫兹的超声做实验,却发现它的吸收系数具有同水一样的数量级。本文从这类溶液分子结构的特点出发,对实验与理论之间的严重分歧做了定性讨论。对丙烯酰胺水溶液超声吸收随浓度的变化关系也做了测量。比较这两种水溶液超声吸收的实验结果,可以认为聚丙烯酰胺溶液中过量的超声吸收来自于大分子本身的特性行为。对这两种溶液的超声传播速度和密度也做了测量,并由所测数据计算了溶液绝热压缩系数的浓度曲线。结果表明,溶质分子中某些原子基因不管是处在聚合物状态还是处在小分子物质中,它们在水溶液中均表现出完全同样的水化作用。
    The shear viscosity of concentrated aqueous solution of polyacrylamide is so high that, according to the classical theory of the aioustic absorption, ultrasonic vibration can not propagate in it at all. However, our experiment with ultrasonic wave of frequency 11.4 MHz finds that it exhibits ultrasonic absorption with the same order of magnitude as water does. This paper gives a qualitative explanation about the great difference between theory and experiment on the ground of molecular structural feature of this kind of solution.The measurements of the ultrasonic absorption of acrylamide aqueous solution with various concentrations have also been carried out. By comparing the experimental results of the two solutions it can be considered that the excessive ultrasonic absorption of the polyacylamide solution comes from the characteristic behavious of the solute macromolecules themselves.The ultrasonic velocity and density of these two solutions are also investigated. From them the concentration curves of compressibilities has been calculated and it is found that some atomic groups in the solute molecules exhibit the same hydrate behavior in the aqueous solution independent of whether they are in polymer or in small molecular substance.
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  • 文章访问数:  6391
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  • 被引次数: 0
出版历程
  • 收稿日期:  1979-06-21
  • 刊出日期:  2005-07-29

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