Structural Study on Aromatic Poly(amic n-alkyl ester)s and Their Derivatives by Solid-State Imidization II. Effect of Unremoved Alkyl Chains Attached by Ether Linkage

Structural Study on Aromatic Poly(amic n-alkyl ester)s and Their Derivatives by Solid-State Imidization I. Effect of Alkyl Chains on the Structure Change

“…In our forthcoming paper [26], structure of polyamides having some alkyl chains attached via ether bond, which are not eliminated by imidization reaction, will be investigated. Fig.…”

Spontaneous Chain Orientation of Aromatic Polyimides Evolved during Thermal Imidization from Shear-Oriented Glassy Liquid Crystalline Precursors

“…The chemical structures of a series of target PAE precursors (PM m ; m is the number of carbon atoms in the n -alkyl-ester side chain, C m H 2 m +1 ) and the corresponding aromatic polyimide, PMDA-TFDB, are presented in Figure . PM m was synthesized from pyromellitic dianhydride (PMDA)-based diacid chloride and the −CF 3 -containing aromatic diamine 2,2′-bis­(trifluoromethyl)­benzidine (TFDB) through a conventional solution polycondensation method , in anhydrous N -methyl-2-pyrrolidone (NMP) at ambient temperatures. The para -isomers of the PMDA-based diacid chloride monomers (half-ester derivatives with n -alkyl side chains) were synthesized according to the methods reported in the literature. , The crude PM m was purified by precipitation from the NMP solution into distilled water, washed in acetone for 30 min at least three times to remove the residual NMP, and dried under vacuum at 70 °C.…”