The present monograph is intended as an introduction into a field which
certainly did not receive proper attention in the past. It is one of the
aims of this book to verify this suppo- sition. The author hopes to show
that the technique of the measurement of flow birefringence can fulfil
an important com- plementary task in polymer melt rheology. From this
point it is expected that the present monograph will attract the atten-
tion of polymer scientists in general, and of rheologists and process
engineers in particular. Certainly, the fourth chapter will appeal to
the latter group. As a teacher in polymer science and technology the
author wants to address also the group of the graduate students. In
fact, the standard knowledge acquired during usual university studies in
chemistry, physics or engineering does not enable a quick start of
research activities in the field of polymer melt rheology. Certainly, in
this typically interdisciplinary field everyone can lay emphasis on
matters which are familar to hirn because of his preceding education.
Significant research activities, however, can only be generated on the
basis of a more universal knowledge. In the absence of this knowledge
beginners have to rely upon the guidance of their supervisors for an
unduly long period. Otherwise they take the risk of losing too much of
their costly time. This holds in particular for the experimentalists who
cannot be dispensed from being familiar with the necessary theoretical
background.