Semi-aromatic polyamides containing methylene and thioether units: synthesis and membrane properties. Issue 101 (18th October 2016)

• Record Type: Journal Article
• Authors: Zhang, Gang; Cao, Su-Jiao; Ren, Hao-Hao; Wang, Xiao-Jun; Long, Sheng-Ru; Yang, Jie
• Is Part Of: RSC advances. Volume 6:Issue 101(2016)
• Page Start: 99184
• Page End: 99194
• Publication Date: 2016-10-18
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra20717k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The membranes of the resultant semi-aromatic polyamides showed good corrosion resistance, mechanical and thermal properties. Abstract : A series of semi-aromatic diamines containing a different content of methylene and thioether units were synthesized via reaction with 4-aminobenzenethiol (4-ABT) and a semi-aromatic difluorobenzamide. They were then reacted with 4, 4′-thiodibenzoyl chloride (TDC) to yield a series of semi-aromatic polyamides. Thermal property investigation confirmed a high glass transition temperature ( T g ) of 163–203 °C and a good thermal stability with initial degradation temperatures ( T d ) of 409 to 419 °C for the synthesized semi-aromatic polyamides, as determined by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) characterization. A water flux and retention rate for the resultant semi-aromatic polyamide membranes in the range of 89–371 L (m 2 h) −1 was observed when measured by ultrafiltration cup experiments, which suggests that they are suitable for separation processes. The resultant semi-aromatic polyamides showed good corrosion resistance especially in a strong alkaline environment. It was found that they can withstand a solution of NaOH (2 mol L −1 ) for nearly 6 months without loss of mechanical strength.