Preparation and properties of polyesters from diphenylmethane-4,4′-di(methylthiopropionic acid) and aliphatic diols

✍ Scribed by Anna Kultys

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 676 KB
• Volume: 35
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(199702)35:3<547::aid-pola20>3.0.co;2-n

✦ Synopsis

The new linear polyesters containing sulfur in the main chain were obtained by melt po-Iyconciensation ofdiphenylmethane-4,4'-di(methylthiopropionic acid) with ethanedioI, 1,3propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,2-propanediol, l,3-butanediol, and 2,2'-oxydiethanol. Low-molecular weights, low-softening temperatures and, very good volubility in organic solvents are their characteristics. The structure of all polyesters was determined by elemental analysis, FT-IR and ' H-NMR spectroscopy, and x-ray diffraction analysis. The thermal behavior of these polymers was examined hy differential thermal analysis (DTA), thermogravimetric analysis (TGA), and differential scanning calorimet ry (DSC). The kinetics of polyesters formation by uncatalyzed melt polycondensation was studied in a model system: diphenylmethane-4,4'-di (methylthiopropionic acid) and 1,4butanediol or 2,2'-oxvdiethanol at 150, 160, and 170°C. Reaction rate constants (k,) and activation parameters (M", AH', AS+) from carboxyl group loss were determined using classical kinetic methods. X: ]997 ,Iohn Wiley & Sons, Inc.