Synthesis and characterization of novel silane-containing aromatic polyamides from bis(p-aminophenoxy)diphenylsilane and aromatic dicarboxylic acids

✍ Scribed by Der-Jang Liaw; Dung-Lang Ou

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 404 KB
• Volume: 62
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19961003)62:1<9::aid-app2>3.0.co;2-y

✦ Synopsis

A new silane-containing diamine, bis(p-aminophenoxy)diphenylsilane (BAPPS) (I), was prepared by the condensation of p-aminophenol with dichlorodiphenylsilane. A series of silane-containing aromatic polyamides was prepared by the direct polycondensation of BAPPS with various aromatic dicarboxylic acids in N-methyl-2-pyrrolidinone using triphenyl phosphite and pyridine as condensing agents. The polymers were examined by 13C- NMR (nuclear magnetic resonance), infrared (IR) spectra, inherent viscosity, X-ray diffraction, solubility, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The diffraction diagram revealed that polyamides were crystalline or semicrystalline. Almost all of the polyamides were soluble in dimethyl sulfoxide (DMSO), but insoluble in tetrahydrofuran (THF) solvent. The polyamides had glass transition temperatures in the range of 143-194°C.