Synthesis and characterization of aromatic poly(ether sulfone imide)s derived from sulfonyl bis(ether anhydride)s and aromatic diamines

✍ Scribed by Sheng-Huei Hsiao; Perng-Chih Huang

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 152 KB
• Volume: 36
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19980730)36:10<1649::aid-pola18>3.0.co;2-g

✦ Synopsis

Two sulfonyl group-containing bis(ether anhydride)s, 4,4 -[sulfonylbis(1,4-phenylene)dioxy]diphthalic anhydride ( IV ) and 4,4 -[sulfonylbis(2,6-dimethyl-1,4-phenylene)dioxy]diphthalic anhydride (Me-IV ), were prepared in three steps starting from the nucleophilic nitrodisplacement reaction of the bisphenolate ions of 4,4 -sulfonyldiphenol and 4,4 -sulfonylbis(2,6-dimethylphenol) with 4-nitrophthalonitrile in N,N-dimethylformamide (DMF). High-molar-mass aromatic poly(ether sulfone imide)s were synthesized via a conventional two-stage procedure from the bis(ether anhydride)s and various aromatic diamines. The inherent viscosities of the intermediate poly(ether sulfone amic acid)s were in the ranges of 0.30-0.47 dL/g for those from IV and 0.64-1.34 dL/g for those from Me-IV. After thermal imidization, the resulting two series of poly(ether sulfone imide)s had inherent viscosities of 0.25-0.49 and 0.39-1.19 dL/g, respectively. Most of the polyimides showed distinct glass transitions on their differential scanning calorimetry (DSC) curves, and their glass transition temperatures ( T g ) were recorded between 223-253 and 252-288ЊC, respectively. The results of thermogravimetry (TG) revealed that all the poly(ether sulfone imide)s showed no significant weight loss before 400ЊC. The methyl-substituted polymers showed higher T g 's but lower initial decomposition temperatures and less solubility compared to the corresponding unsubstituted polymers.