Solution viscosity of polyamic acid based on pyromellitic dianhydride, 4,4'- diaminodiphenyl ether, 3,5-diaminobensoic acid filled by carbon nanotubes - T. A. Shantalij; I. L. Karpova; I. P. Getmanchuk; V. F. Shumskij (Polymer journal, 2015)