By J. L. Hedrick, K. R. Carter, J. W. Labadie (auth.), Professor Dr. H. R. Kricheldorf (eds.)
Those new volumes of Advances in Polymer Science tell the reader on a wide number of subject matters within the box of synthesis, characterization and alertness of polyimides. They describe and speak about result of contemporary basic examine and utilized examine and concentrate on themes equivalent to new man made tools, thermostable nanofoams, insulating cord enamels, thermosetting resins and liquid-crystalline polyimides.
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Sample text
To obtain the poly(ester-imide) a polyester precondensate is made followed by the addition of melamine and trimellitic anhydride. At 245 °C the reaction is completed. The resulting resin dissolved in N-methylpyrrolidon gives a hard film on wire with a good heat shock resistance.
Thus, the efficiency of foam formation is poor, irrespective of the copolymer architecture. Conversely, 27 Nanoporous Polyimides Table 4. 5 16 30 14 19 – 0 0 aPorosity determined by IR technique Table 5. 0 the propylene oxide-based copolymers with PMDA/ODA as the imide component did not show the expected density drop, and the values were essentially identical to that of the homopolymer. In PMDA/ODA-based systems, molecular ordering and orientation were found to be critical in controlling the stability of the foam structure.
The porosity values, as determined by the density column measurements, for the foamed copolymers derived from the styrene and a-methylstyrene coblock were unreliable [25]. In all cases, the density gradient method yielded porosity values which were consistently lower than those described above. During the course of the measurement, the film which settled initially to a specific height in the column drifted downwards in the column to higher densities. This, apparently, results from the fluid penetrating into the porous film, which eventually leads to density values comparable to the 3FDA/PMDA polyimide homopolymer.