Synthesis and properties of soluble, fluorescent polyesters and polyethers with substituted m-terphenyl segments in the main chain

✍ Scribed by John A. Mikroyannidis

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 223 KB
• Volume: 38
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/1099-0518(20000701)38:13<2381::aid-pola110>3.0.co;2-u

✦ Synopsis

A new series of rigid polyesters and semiflexible polyethers were synthesized from 4,4Љ-dihydroxy-5Ј-phenyl or anthracenyl-m-terphenyl. The polymers were characterized by viscometry, Fourier transform infrared, NMR, X-ray, differential scanning calorimetry, thermomechanical analysis, thermogravimetric analysis, ultraviolet-visible, and luminescence spectroscopy. The polyesters were amorphous, whereas some of the polyethers showed a low degree of crystallinity. All the polymers displayed an enhanced solubility even in 1,1,2,2-tetrachloroethane and tetrahydrofuran. The glass-transition temperatures were 123-146 °C for the polyesters and 45-117 °C for the polyethers. The polymers were stable up to 213-340 °C and afforded anaerobic char yields of 36 -62% at 800 °C. Their optical properties were investigated both in solution and in the solid state. They showed ultraviolet fluorescence, violet-blue fluorescence, or both with emission maxima at 333-487 nm. The polymers with anthracenyl pendent groups exhibited higher fluorescence quantum yields and emission maxima redshifted compared with the corresponding polymers with phenyl pendent groups.