Preparation and properties of disilane-containing photodegradable aromatic polyamides from bis(p-aminophenyl)tetramethyldisilane and aromatic diacid chlorides

✍ Scribed by Munirathina Padmanaban; Masa-Aki Kakimoto; Yoshio Imai

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 526 KB
• Volume: 28
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/pola.1990.080280622

✦ Synopsis

Abstract

1,2‐Bis(p‐aminophenyl)tetramethyldisilane was synthesized from 1,2‐dichlorotetramethyldisilane and 4‐[N,N‐bis(trimethylsilyl)amino]phenyllithium. The diamine was reacted with various aromatic diacid chlorides giving disilane‐containing aromatic polyamides (aramids), whose inherent viscosities were between 0.27 and 0.70 dL/g, depending on the diacid chlorides used. The aramids had glass transition temperatures between 194 and 255°C. No weight loss was observed below 350°C. Some of the polymers were found to be semicrystalline based on their x‐ray diffractograms. The aramid films showed a strong ultraviolet (UV) absorption at 287 nm, which decreased during irradiation with UV light, suggesting that cleavage of the silicon‐silicon bond in the aramid backbone occurs. A decrease in the inherent viscosity and molecular weight of the soluble aramid derived from phenylindanedicarbonyl chloride was also observed by irradiation with UV light.