Premium
Interaction between unlike macromolecules: A new method based on the motional resistance response of a piezoelectric quartz crystal
Author(s) -
Mao Youan,
Wei Wanzhi,
Zhang Jinzhong
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.10759
Subject(s) - viscometer , polyethylene glycol , quartz crystal microbalance , vinyl alcohol , peg ratio , macromolecule , viscosity , materials science , polymer , quartz , piezoelectricity , crystal (programming language) , ethylene glycol , polymer chemistry , chemical engineering , analytical chemistry (journal) , chemistry , composite material , chromatography , biochemistry , adsorption , finance , computer science , engineering , economics , programming language
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 25°C 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 α. Experimental results indicated that the values of α 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 α 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. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 2528–2534, 2002