Poly(ether-imide-amide)s obtained from bis[4-(4-aminophenoxy)phenyl] diphenylsilane and dicarboxylic acids derivatives of bis(3,4-dicarboxyphenyl)dimethylsilane anhydride combined with l-aminoacids

Poly(ether-imido-amide)s (PEIAs) that contain R,R-diphenylsilane units and l-alanine or l-phenylalanine as aminoacidics moieties in their main chain were obtained by Yamazaki–Higashi phosphorylation technique. The polymers were characterized by elemental analysis and spectroscopic techniques. Inherent viscosity measures, as indirect registration of their molecular weight, were carried out. These results suggest that the PEIAs correspond to oligomers or polymers of low molecular weight. Specific properties were established and compared with results already obtained from similar polymers synthesized using a rigid silylated-diamine. Solubility analyses show that both polymers were soluble in a wide range of polar organic solvents, even in THF. Optical analysis in the UV–visible region determines that the sample containing the l-alanine residue presents a high transmittance. These polymers have high thermal stability with TDT10 % values near to 400 °C. DSC analyses allowed the determination of the Tg values pointing out a wide application thermal range.