Synthesis of photoreactive poly(ether ether ketone)s containing alkyl groups

✍ Scribed by Mitsuru Ueda; Hideaki Toyoda; Tomonari Nakayama; Tomomi Abe

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 517 KB
• Volume: 34
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19960115)34:1<109::aid-pola11>3.0.co;2-p

✦ Synopsis

Poly(ether ether ketone)s containing alkyl groups were prepared by nucleophilic substitution reaction of alkyl-substituted difluoro diaryl ethers with hydroquinone or by electrophilic substitution reaction of alkyl-substituted diaryl ether with 4,4'-oxydibenzoic acid in PPMA. Polycondensations proceeded smoothly and produced polymers having inherent viscosities up to 0.5-1.6 dL/g. The polymers were quite soluble in strong acid, dipolar aprotic solvents, and chloroform a t room temperature. Thermogravimetry of the polymers showed excellent thermal stability, indicating that 10% weight loses of the polymers were observed in the range above 450°C in nitrogen atmosphere. The glass transition temperatures of the polymers ranged from 128 to 146°C. Furthermore, Polymer 3b functioned as a photosensitive resist of negative type for UV radiation. The resist had a sensitivity of 42 mJ/cm2 and a contrast of 2.5, when it was postbaked at 100°C for 10 min, followed by development with THF/acetone a t room temperature.