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Definitions of what is meant by a heat-resistant polymer vary
considerably. We have taken the term to mean a polymer which can be
used, at least for short time periods, at temperatures from 150
DegreesC. The greatest problem which arises in writing a monograph
on such materials is the tremendous amount of data that is
available. More than 2000 references have been published on one
heat-resistant polymer system alone over a period of little more
than two years. The result is that a very high degree of
selectivity must be exercised with respect to the information
reproduced. We have chosen to restrict our coverage to polymers
that have received at least some degree of commercial exploitation
and to details of their methods of preparation, their thermal and
thermo-oxidative stabilities and modes of degradation, and their
properties at elevated temperatures. It must be emphasized that
other properties not cited, e. g. , hydrolytic and chemical
stability, and resistance to ultraviolet radiation, may be equally
important in particular uses of these materials. The "older"
heat-resistant polymers, e. g. , the thermosets and some of the
fluorine-containing materials, are not dealt with in such depth as
are the "newer" polymers with aromatic and/or heterocyclic rings in
the chain. This is because books have been available for some time
on the well-established commercial polymers and developments in
them have not been as marked re cently as in the aromatic and
heterocyclic macromolecules.
Definitions of what is meant by a heat-resistant polymer vary
considerably. We have taken the term to mean a polymer which can be
used, at least for short time periods, at temperatures from 150
DegreesC. The greatest problem which arises in writing a monograph
on such materials is the tremendous amount of data that is
available. More than 2000 references have been published on one
heat-resistant polymer system alone over a period of little more
than two years. The result is that a very high degree of
selectivity must be exercised with respect to the information
reproduced. We have chosen to restrict our coverage to polymers
that have received at least some degree of commercial exploitation
and to details of their methods of preparation, their thermal and
thermo-oxidative stabilities and modes of degradation, and their
properties at elevated temperatures. It must be emphasized that
other properties not cited, e. g. , hydrolytic and chemical
stability, and resistance to ultraviolet radiation, may be equally
important in particular uses of these materials. The "older"
heat-resistant polymers, e. g. , the thermosets and some of the
fluorine-containing materials, are not dealt with in such depth as
are the "newer" polymers with aromatic and/or heterocyclic rings in
the chain. This is because books have been available for some time
on the well-established commercial polymers and developments in
them have not been as marked re cently as in the aromatic and
heterocyclic macromolecules.
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