Na. Kalinina et al., STRUCTURAL TRANSFORMATIONS IN CONCENTRATE D-SOLUTIONS OF POLY(P-PHENYLENE)PYROMELLITAMIDO ACID, Vysokomolekularnye soedinenia. Seria A, 37(5), 1995, pp. 859-860
The formation processes of structure in 12% solutions of poly(p-phenyl
ene)pyromellitamido acid in DMAA that take place upon storage for a mo
nth at room temperature and for a year at 2 degrees C were quantitativ
ely studied by polarized light scattering. The structural rearrangemen
ts were reversible and heating for 15 min at 50 degrees C restored the
initial structure of the system.