Abstract:
It is shown that the extensive experimental material available in the literature
reflecting the behaviour of thermosensitive hydrogels and solutions of thermosensitive
polymers requires systematisation and generalisation. Additional evidence is given that the
method of forward and reverse phase portraits is an important tool for the systematisation
of such data. It is shown that using this method makes it possible to refine the characteristics
of the phase transition, as well as to classify thermosensitive hydrogels and solutions
according to such classification criteria as the number of phase transition stages. Based on
the developed classification, a new semi-empirical theory of phase transitions is proposed.
Using this model, it is shown for the first time that phase transitions can be described
through equivalent chemical reactions of the first and second orders. The proposed model
allows us to explain the fact that the phase portraits obtained from experimental data
often contain segments corresponding to parabolic and linear dependences. It is shown
that the proposed approach creates a basis for systematisation of the results accumulated
in the field of study of thermosensitive polymers in automatic mode by means of image
recognition technologies.
