The problem is creation of the high-strength and high-modulus
materials based on highly-oriented polymers have become increasingly
important.
The production technology for highly oriented polymers is developing
in two ways. Polymer orientation in a solution or melt by drawing with
the consequent or simultaneous crystallization and orientation in
solid polymer systems by directed plastic deformation. The second way
seems to be more interesting due to the great number of technological
advantages for the production of various highly- oriented and high
strength articles, made of complex shaped polymers.
At present time the extrusion in solid state (piston or
hydroextrusion) is one of the prospective method for these aims. We
have done the systematically investigations of different
thermoplastics. We have studied the interrelation between
technological parameters of process, level of obtained properties and
peculiarities of structure formation for various sorts of
thermoplastics.
In this report the next questions will be considered:
* solid hydrostatic extrusion of thermoplastics, process and
peculiarities;
* peculiarities of physico-mechanical properties formation for
different polymers under pressure;
* investigation of plastic deformation under pressure at
over-molecular level;
* modification of different polymer structures at deformation;
studies of peculiarities of reorganization structure of partial-
crystalline and amorphous polymers as example;
* interrelation between properties and structures of deformed
polymers.
* obtaining of products and conclusion.
|