Synthesis and characterization of aromatic poly(ether-imide)s based on bis(4-(3,4-dicarboxyphenoxy)phenyl)-R,R-silane anhydrides (R = Me, Ph) – spontaneous formation of surface micropores from THF solutions

Abstract

Poly(ether-amide)s derived from two new silylated-dianhydrides were prepared and characterized. By FE-SEM and AFM morphological studies were developed.

Oligomeric poly(ether‐imide)s bearing ortho trifluoromethyl groups: Solubility, thermal studies, and optical properties

“…In both cases, a signal near to 8 ppm was observed, which agree with the magnetic environment of the heteroatom. This fact has been previously reported by our group in several articles …”

“…Transmittance spectra of the PEIs are shown in Figure . The wavelength values corresponding to 80% of transmittance ( T 80% ) ranging from 341 to 403 nm (Table ), indicating that the synthesized materials are transparent for the visible light . This could be attributed to the low η inh values, associated to short chain sizes and to the poor packing of polymers chains, allowing the passage of photons through their solutions without any significant absorption.…”

“…Recently, we reported a series of poly(ether‐imide)s (PEIs) based on diamines with dimethylsilane [Si(CH 3 ) 2 ] or diphenylsilane [Si(Ph) 2 ] units and oxy‐ether bonds, which presented good solubility and thermal stability, and relatively low T g values . In a continuation of this work, the present article deals with the synthesis of six new oligomeric poly(ether‐imide)s based on the novel diamine monomers, 4,4′‐((propane‐2,2‐diylbis(4,1‐phenylene))bis(oxy))bis(2‐(trifluoromethyl)aniline) (M1) and 4,4′‐(((diphenylmethylene)bis(4,1‐phenylene))bis(oxy))bis(2‐(trifluoromethyl)aniline) (M2), and some preliminary studies of their physical properties, such as solubility in common organic solvents, thermal resistance, thermal transitions, and visible transparency.…”

Synthesis and properties of soluble aromatic polyimides from novel 4,5-diazafluorene-containing dianhydride

“…The diazauorene moiety increased the distance between the polymer molecules, thereby reducing the aggregation of the chain and leading to better solvent dispersion. The 198 | RSC Adv., 2018,8,[194][195][196][197][198][199][200][201][202][203][204][205] This journal is © The Royal Society of Chemistry 2018 introduction of exible ether bond groups changed the polymer chain twist angle, allowed the aromatic ring to rotate freely, therefore, the solubility of polyimides were improved effectively. 38 Moreover, the presence of the pyridine rings in the diazauorene moiety also increased the polymer solubility, because the protonation of the lone pair electrons on the nitrogen atom can increase the solubility of the resulting polyimide in polar solvents, and pyridine rings could provide strong intermolecular interactions.…”

“…However, the rigid structure, strong inter-molecular interactions and charge transfer complex (CTC) of aromatic polyimides always lead to their poor solution processability and dark brownish colour, limiting their application in many areas. [8][9][10][11] Generally, polyimides are synthesized by the polycondensation of diamine and dianhydride. Many approaches focused on structure modication (novel diamine and dianhydride), such as introducing aliphatic chains, 12,13 exible linkage, [14][15][16] nonplanar structure, [17][18][19][20] bulky CF 3 groups [21][22][23] and ring-shaped structures, 24 are developed to overcome the traditional PIs' drawbacks mentioned above.…”