The phase behavior of tetramethyl bisphenol-A polyarylate/aliphatic polyester blends

✍ Scribed by Tae Oan Ahn; Muyoung Lee; Han Mo Jeong; Kilwon Cho

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 260 KB
• Volume: 36
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19980130)36:2<201::aid-polb1>3.0.co;2-u

✦ Synopsis

The phase behavior of blends of tetramethyl bisphenol-A polyarylate (TMPAr) with various linear aliphatic polyesters characterized by the ratio of aliphatic carbons to ester groups in the repeating unit, CH 2 /COO Å 3 Ç 9, was examined by differential scanning calorimetry and dynamic mechanical analysis. TMPAr/aliphatic polyester blends prepared by solvent casting were found to be miscible when the CH 2 / COO ratio of aliphatic polyesters was larger than 4 and up to 9. The thermodynamic interaction parameter, B for the miscible blends was determined by the analysis of the depression of the melting point of polyester using the Hoffman-Weeks method. From the analysis of the heat of mixing data using a binary interaction model, it was concluded that strong unfavorable intramolecular interaction exists between the {CH 2 { and {COO{ units in aliphatic polyesters and that four substituted methyl groups produces more favorable effects on the miscibility TMPAr with aliphatic polyesters.