Glass-to-Gel Transition in Solvent-Swollen Polystyrene Networks

摘要

Glass transition temperatures have been determined for polystyrenes crosslinked with 1-10% divinylbenzene and swollen with toluene, chloroform, N,N-dimethylformamide, and tetrahydrofuran to as high as 0.7 weight fraction solvent. The T(g)'s depend approximately on the weight fractions and the T (g)'s of the components according to the empirical equation 1nT(g) = m(1) 1nT(g1) + m(2)1nT (g2) of Pochan. The T(g)'s of the networks swollen with toluene also fit approximately a quasithermodynamic equation of Karasz based on the T(g)'s and the delta C (p)'s at T (g) of the components.