Progress in Polyimide Chemistry II by J. L. Hedrick, K. R. Carter, J. W. Labadie (auth.),

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 huge number of themes within the box of synthesis, characterization and alertness of polyimides. They describe and speak about result of fresh basic study and utilized learn and concentrate on themes resembling new man made tools, thermostable nanofoams, insulating twine enamels, thermosetting resins and liquid-crystalline polyimides.

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In order to obtain unsaturated poly(ester-imide)s soluble in styrene and having low viscosities, imide structures are used as endcapping groups. Figure 2 illustrates structures of unsaturated poly(ester-imide) resins, one branched by trimellitic anhydride (2) and the other by THEIC (3). Fig. 1. -W. Lienert Table 1. 065 % 20 25 25 25 °C °C °C 130 280 120 135 155 420 150 155 200 280 140 180 200a 400 185 220 a Heat shock 10% elongation plus 1*d Fig. 2. 1 Monomers A saturated poly(ester-imide) is made by modifying linear or branched polyesters with imide-containing structures (Fig.

73 7 Thermoplastic Poly(ester-imide)s . . . . . . . . . . 73 8 Other Application Areas . . . . . . . . . . . . . 75 9 Conclusions and Outlook . . . . . . . . . . . . 76 10 References . . . . . . . . . . . . . . . . . 77 . . . . . . . . . -W. Lienert 1 Introduction Poly(ester-imide)s are a class of thermally stable polymers having a wide use mainly in the electrical industry. In 1997 the demand of the electrical industry for saturated poly(ester-imide)s based wire enamels was approximately 40,000 tons and for unsaturated poly(ester-imide)s for coil impregnation it was also several thousand tons world-wide.

As the blocks decompose by unzipping, some of the monomer diffuses into the polyimide matrix, plasticizing the polyimide. The decomposition of these blocks, particularly amethylstyrene, is quite rapid, however, because of the unzipping process probably more rapid than the monomer diffusion rate. The respective monomers, at these elevated temperatures, exert a substantial pressure on the surrounding matrix. Since the matrix is at least partially plasticized, significant blowing occurs (Fig. 13).

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