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Thermal And Rheological Properties Of Miscible Polyethersulfone/Polyimide Blends, William Macknight, K. Liang, J. Grebowicz, E. Valles, F. E. Karasz
Thermal And Rheological Properties Of Miscible Polyethersulfone/Polyimide Blends, William Macknight, K. Liang, J. Grebowicz, E. Valles, F. E. Karasz
William MacKnight
Blends of an aromatic polyethersulfone (commercial name Victrex) and a polyimide (com- mercial name Matrimid 5218), the condensation product of 3,3’,4,4’-benzophenone tetra- carboxylic dianhydride and 5 (6)-amino-1- (4’-aminophenyl) -1,3,3’-trimethylindane,
were studied by differential scanning calorimetry, dynamic mechanical analysis, and rheological techniques. The blends appeared to be miscible over the whole range of compositions when cast as films or precipitated from solution in a number of solvents. After annealing above the apparent phase boundary, located above Tg,the blends were irreversibly phase separated indicating that the observed phase boundary does not represent a true state of equilibrium. Only a narrow “processing window” …