AZEOTROPY IN TERPOLYMERIZATION OF N-ANTIPYRYL ACRYLAMIDE WITH DIFFERENT ALKYL ACRYLATES OR STYRENE AND ACRYLONITRILE

Ternary copolymerization of N-antipyryl acrylamide (NAA) with differen t alkyl acrylates [methyl acrylate (MA), ethyl acrylate (EA), butyl ac rylate (BuA)] or styrene (ST) and acrylonitrile (AN) were carried out in solution at 65-degrees-C in the presence of AIBN as a free radical initiator. Experimental terpolymerization data agree well with calcula tions based on the Alfrey-Goldfinger equation. The determination of un itary, binary, and ternary azeotropes of various systems studied was e asily handled by a computer program. Ternary azeotropic compositions f or NAA-MA-AN, NAA-EA-AN, NAA-BuA-AN, and NAA-ST-AN systems were 31.0: 10.0: 59.0, 37.0: 09.0: 54.0, 23.0: 10.0: 67.0, and 66.5: 30.50: 03.0 mol %, respectively. Selective unitary and binary azeotropic compositi ons were polymerized and the obtained results show good agreement betw een the theoretical and experimental terpolymer composition for each c ase. Also, pseudo-azeotropic regions were identified where the deviati on between feed and polymer composition is very small. The azeotropic points of the four systems were confirmed using Tarasov et al.'s equat ions and were found to have satisfactory results. (C) 1994 John Wiley & Sons, Inc.