Specificity of supermolecular structure in polyamido-imides

Adhesion and Energy Characteristics of Rigid-Chain Polymer Surface: Polyamidoimides

“…XPS data confirmed the presence of the – fragment in the surface layer (in the amount of 0.8–1.6% at. ), and the X-ray structure analysis data for PAI indicated the presence of a more ordered mesomorphic phase in the volume and on the polymer surface [ 18 , 19 ].…”

“…The main contribution to the change in the surface characteristics of these polymers was the change in the packing density of PAI macromolecules, which was reflected mainly in the change in the dispersion component of the polymers. We can recall that the general structural kinetic model of the PAI structure suggests a slowdown of the torsional vibrations of phenylene rings, parallel positioning of phenylene and heterochain groups in distortedly parallel regions of amorphous polymers [ 18 , 19 ]. These results led us to assume that the surface activity of all groups that compose the monomer unit is constant and weakly depends on the thermal prehistory of the rigid-chain adhesive.…”

Morphology and mechanical properties of polymer-inorganic nanocomposite containing triple chain fibrous Na-Mg hydrosilicate

“…Note that the elastic modulus of the specimen cut along the direction of the blade motion during the film preparation was significantly higher. The films chemically identical to those used in this work (prepared via the solution casting onto the glass surface followed by the solvent evaporation) have possessed the mesomorphic structure with typically planar orientation of the macromolecules [29,30]. The formation of the films using the squeegee blade directed likely the predominant orientation of the polymer chains in the casting solution, thus leading to the observed anisotropy of the mechanical properties of the as prepared films (Table 2).…”

“…The presence of the small-angle reflections evidenced the mesomorphic state of the polyamidoimide [29,30].…”

Polyamide-Imide Membranes of Various Morphology - Features of Nano-Scale Elements of Structure

“…There is a question what reason of the formation of the oriented PAI domains, «as weaved» from polymeric chains. The results of X-ray researches showing are known, the structures of dense PAI films and asymmetric PAI-supports, as a whole, do not contain sites with notable degree of heterogeneity; fragments with high degree of crystallinity are absent [32][33][34]. In PAI-1 films obtained by a pouring on a solid basis of a solution of polymer with its subsequent drying, always there is a structure which is characterized by orientation of chains in a film plane (Fig.…”