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Interaction between unlike macromolecules: A new method based on the motional resistance response of a piezoelectric quartz crystal

机译:不同大分子之间的相互作用:基于压电石英晶体的运动阻力响应的新方法

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摘要

A new method for the study of the interaction between unlike macromolecules was developed, based on the motional resistance (R-m) response of a piezoelectric quartz crystal sensor to viscosity change in a contacting dilute polymer solution. The experimental setup, constructed with a 9-MHz AT-cut quartz crystal, a flowthrough detection cell, and an impedance analyzer, was shown to provide highly reproducible data at 25degreesC and a fluid flow rate of 1.3-1.6 mL/min. A quantitative relationship between R-m and the relative viscosity of the dilute polymer solution was derived. A model for using R-m to study the interaction was proposed. The interaction between polyethylene glycol (PEG) and poly(vinyl alcohol) (PVAL) was studied by this method with a thermodynamic parameter a. Experimental results indicated that the values of a for the blend PEG/PVAL were 0.094 and 0.086, corresponding to molecular weights of PEG of 10,000 and 20,000, respectively, and in agreement with those of capillary viscometry. The positive value of a showed that an attractive interaction existed between PEG and PVAL. An important feature of the new method was that it could be used in continuous measurement. (C) 2002 Wiley Periodicals, Inc. [References: 19]
机译:基于压电石英晶体传感器对接触的稀聚合物溶液中粘度变化的运动阻力(R-m)响应,开发了一种研究不同高分子之间相互作用的新方法。实验装置由9MHz AT切割石英晶体,流通检测单元和阻抗分析仪构成,显示在25°C和1.3-1.6 mL / min的流体流速下可提供高度可再现的数据。得出了R-m与稀聚合物溶液的相对粘度之间的定量关系。提出了使用R-m研究相互作用的模型。用热力学参数α,研究了聚乙二醇(PEG)和聚乙烯醇(PVAL)之间的相互作用。实验结果表明,PEG / PVAL共混物的a值为0.094和0.086,分别对应于10,000和20,000的PEG分子量,并且与毛细管粘度测定法一致。 α的正值表明PEG和PVAL之间存在吸引作用。新方法的一个重要特征是可以用于连续测量。 (C)2002 Wiley Periodicals,Inc. [参考:19]

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