Publication Type:

Journal Article


Journal of Polymer Science: Polymer Physics Edition, John Wiley & Sons, Inc., Volume 20, Number 4, p.773–775 (1982)



<p>Dilute-solution studies on styrene-acrylonitrile random copolymer (SA2) of molar composition&nbsp;51% acrylonitrile (AN) in ethyl acetate (EAc) revealed that phase separation occurred in high-molecular-weight fractions as the temperature was raised.' This behavior, known&nbsp;as&nbsp;the lower-critical-solution phenomenon, was originally reported for certain polar systems and attributed to the&nbsp;existence of specific interactions between the polymer and solvent.&nbsp;More recently, Rowlinson and&nbsp;co-worker&nbsp;showed that nonpolar systems also undergo phase separation on elevation of the&nbsp;temperature, but precipitation occurs well above the boiling point of the solvent, in contrast&nbsp;to&nbsp;many&nbsp;polar&nbsp;systems where the polymer usually separates at a temperature below or near the solvent boiling&nbsp;point. From measurements&nbsp;at&nbsp;elevated temperatures, lower-critical-solution temperatures (LCSTs)&nbsp;can be estimated for each fraction, which in the limit of infinite molecular weight is the <em>O</em> temperature.</p>

Cite this Research Publication

Dr. Mangalam Ramanathan and Kalpagam, V., “Styrene-acrylonitrile random copolymer in ethyl acetate”, Journal of Polymer Science: Polymer Physics Edition, vol. 20, pp. 773–775, 1982.