C-13 solid-state nmr study of styrene-crosslinked mixed polyesters

The styrene-crosslinked mixed polyesters derived from maleic anhydride, 2,2 -di-(4-hydroxypropoxyphenyl)propane and I,2-propylene glycol were studied b y means of high-resolution C-13 n.m.r. in the solid state (CP/MAS). The pro ton spin-lattice relaxation time, T-1(H) and spin-lattice relaxation time i n the rotating frame, T-1 rho(H) were determined and compared with correspo nding values calculated for hypothetical mixed ester/styrene copolymers. Th e results, found to be consistent with T-g data, were interpreted in terms of the mixing, copolymer and crosslinking effects. (C) 1999 Elsevier Scienc e Ltd. All rights reserved.