Structural studies of poly(paraphenylene), poly(2,5-thienylene) and their derivatives by solid-state NMR of 1H and 13C

Transient techniques in NMR of ¹H and ¹³C were used to study the chemical and physical structures of solid poly(p-phenylene) (PPP), poly(2,6-dimethyl-p-phenylene oxide) (PDMPO), poly(p-phenylene sulfide) (PPS), poly(p-biphenylene sulfide) (PPBS), poly(p-phenylene selenide) (PPSe), poly(p-biphenylene selenide) (PPBSe), poly(2,5-thienylene) (PT), poly(3-methyl-2,5-thienylene) (PMT), and poly(p-phenylene-co-2,5-thienlyene) (PPPT) of different monomer ratios. ¹³C NMR confirmed the expected chemical structure for homopolymers, and indicated a random distribution of monomer units in PPPT. Relative fractions of crystalline and interfacial regions were determined by measurements of ¹H magnetic relaxation, ¹³C CP/MAS NMR, and XRD. © 1994 John Wiley & Sons, Inc.