Synthesis and properties of polyimides from isomeric bis(dicarboxylphenylthio)diphenyl sulfone dianhydrides

• Published in: Polymer (Guilford) Vol. 46; no. 18; pp. 7678 - 7683
• Main Authors: Yan, Jingling, Wang, Zhen, Gao, Lianxun, Ding, Mengxian
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 23.08.2005; Elsevier
• Subjects: Applied sciences; Exact sciences and technology; Isomeric polyimides; Organic polymers; Physicochemistry of polymers; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; PTPSDA; Structure—property relations; PTPSDA; Structure—property relations; Isomeric polyimides; Polyimide; Transport properties; Sulfone; Aromatic polymer; Mechanical properties; Head to head polymer; Experimental study; Polyaddition; Organic sulfide; Gas permeability; Structure-property relations; Preparation; Selective permeability; Soluble compound; Amorphous polymer; Sulfur containing polymer; Thermostable
• ISSN: 0032-3861; 1873-2291
• DOI: 10.1016/j.polymer.2005.05.157

4,4′-Bis(3,4-dicarboxyphenylthio)diphenyl sulfone dianhydride(4,4′-PTPSDA) and 4,4′-bis(2,3-dicarboxyphenylthio)diphenyl sulfone dianhydride(3,3′-PTPSDA) were synthesized from chlorophthalic anhydrides and bis(4-mercaptophenyl)sulfone. Their structures were determined via IR spectra, 1H NMR and elemental analysis. A series of polyimides were prepared from isomeric PTPSDAs and aromatic diamines in 1-methyl-2-pyrrolidinone (NMP) via the conventional two-step method. Polyimides based on 4,4′-PTPSDA and 3,3′-PTPSDA have good solubility in polar aprotic solvents and phenols. The 5% weight-loss temperatures of isomeric polyimides were near 500 °C in N 2. DMTA and DSC analyses indicated that the glass-transition temperatures of polyimides from 3,3′-PTPSDA are higher than those of polyimides from 4,4′-PTPSDA. The wide-angle X-ray diffraction showed that all polyimides are amorphous. The polyimides from 3,3′-PTPSDA showed higher permeability but lower permselectivity compared with those from 4,4′-PTPSDA.