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P. S. HOPE and M. J. FOLKES Mixing two or more polymers together to
produce blends or alloys is a well-established strategy for
achieving a specified portfolio of physical proper ties, without
the need to synthesise specialised polymer systems. The subject is
vast and has been the focus of much work, both theoretical and
experimental. Much ofthe earlier work in this field was necessarily
empirical and many ofthe blends produced were of academic rather
than commercial interest. The manner in which two (or more)
polymers are compounded together is of vital importance in
controlling the properties of blends. Moreover, particular ly
through detailed rheological studies, it is becoming apparent that
process ing can provide a wide range of blend microstructures. In
an extreme, this is exemplified by the in situ formation of fibres
resulting from the imposition of predetermined flow fields on
blends, when in the solution or melt state. The microstructures
produced in this case transform the blend into a true fibre
composite; this parallels earlier work on the deformation of metal
alloys. This type of processing-structure-property correlation
opens up many new possi bilities for innovative applications; for
example, the production of stiff fibre composites and blends having
anisotropic transport properties, such as novel membranes. This
book serves a dual purpose."
P. S. HOPE and M. J. FOLKES Mixing two or more polymers together to
produce blends or alloys is a well-established strategy for
achieving a specified portfolio of physical proper ties, without
the need to synthesise specialised polymer systems. The subject is
vast and has been the focus of much work, both theoretical and
experimental. Much ofthe earlier work in this field was necessarily
empirical and many ofthe blends produced were of academic rather
than commercial interest. The manner in which two (or more)
polymers are compounded together is of vital importance in
controlling the properties of blends. Moreover, particular ly
through detailed rheological studies, it is becoming apparent that
process ing can provide a wide range of blend microstructures. In
an extreme, this is exemplified by the in situ formation of fibres
resulting from the imposition of predetermined flow fields on
blends, when in the solution or melt state. The microstructures
produced in this case transform the blend into a true fibre
composite; this parallels earlier work on the deformation of metal
alloys. This type of processing-structure-property correlation
opens up many new possi bilities for innovative applications; for
example, the production of stiff fibre composites and blends having
anisotropic transport properties, such as novel membranes. This
book serves a dual purpose."
Block copolymers represent an important class of multi-phase
material, which have received very widespread attention,
particularly since their successful commercial development in the
mid-1960s. Much of the interest in these polymers has arisen
because of their rather remarkable micro phase morphology and,
hence, they have been the subject of extensive microstructural
examination. In many respects, the quest for a comprehensive
interpretation of their structure, both theoretically and
experimentally, has not been generally matched by a corresponding
enthusiasm for developing structure/property relationships in the
context of their commercial application. Indeed, it has been left
largely to the industrial companies involved in the development and
utilization of these materials to fulfil this latter role. While it
is generally disappointing that a much greater synergism does not
exist between science and technology, it is especially sad in the
case of block copolymers. Thus these materials offer an almost
unique opportunity for the application of fundamental structural
and property data to the interpretation of the properties of
generally processed artefacts. Accordingly, in this book, the
editor has drawn together an eminent group of research workers,
with the specific intention of highlighting some of those aspects
of the science and technology of block copolymers that are
potentially important if further advances are to be made either in
material formulation or utilization. For example, special
consideration is given to the relationship between the flow
properties of block copo lymers and their microstructure."
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