GLASS-TRANSITION BEHAVIOR OF ACRYLIC DONOR OR ACCEPTOR COPOLYMERS - HOMOPOLYMERS AND THEIR POLYMER BLENDS WITH EDA COMPLEXATION

Glass transition temperature (Tg) vs. composition studies on acrylic copolymers of electron donor N-(2-hydroxyethyl)carbazolylacrylate and of electron acceptor β-hydroxyethyl-3,5-dinitrobenzoyl acrylate show specific nonlinear composition dependences comparable with those of the methacrylate copolymers. Blends of methylacrylic donor and n-butylacrylic acceptor copolymers or vice versa are compatible, if the incooperated donor or acceptor groups exceed about 35 mole percent. The application of the virial equation - an extended Gordon-Taylor equation - for the Tg of compatible polymer blends, composed of homopolymer acrylic or methacrylic donor and homopolymer acrylic or methacrylic acceptor implies both strong energetic interactions of the heterocontacts and associated free-volume effects due to conformational rearrangements in the neighbourhood of the binary heterocontacts. © 1990.