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The last twenty years or so have seen a flurry of activity in the
synthesis of new polymer systems. This interest has developed
largely as a result of the increased need for advanced materials.
Despite the emergence of a number of outstanding polymers, it is
the polyimides that have captured the imagination of scientists and
engineers alike as materials that offer outstanding promise for the
high technology applic ations of the future. The reputation of the
polyimide has been established on the bases of outstanding thermal
stability, excellent mechanical properties and the ability to be
fabricated into useful articles. Polyimides offer a versatility
unparalleled in most other classes of macromolecules. Polymers can
be prepared from a variety of starting materials, by a variety of
synthetic routes. They can be tailor-made to suit specific
applications. By judicious choice of starting materials, polymers
can be made that offer variations in such properties as glass
transition tempera ture, oxidative stability, toughness, adhesion,
and permeability. It is this versatility that has led to the use of
polyimides in a wide variety of applications. The electronics
industry makes extensive use of poly imide films in, ior example,
semiconductor applications. The leading polymer matrices for high
temperature advanced composites are polyimides. High temperature
adhesive systems for the bonding of metals or composites are often
based on polyimides. In addition, polyimides are now finding use as
fibres, foams, sealents and even membranes for the low energy
separation of industrial gases.
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