THERMO-MECHANICAL MODIFICATION OF AMORPHOUS POLYESTER FIBRES: III. STRUCTURE INVESTIGATIONS USING WIDE ANGLE X-RAY SCATTERING: THERMO-MECHANICAL MODIFICATION OF AMORPHOUS POLYESTER FIBRES: III. STRUCTURE INVESTIGATIONS USING WIDE ANGLE X-RAY SCATTERING

Valentin  Velev; Anton  Popov; Pencho  Kyurkchiev; Lyubomira Veleva

doi:10.46687/jsar.v4i1.103

Authors

Valentin Velev KONSTANTIN PRESLAVSKI UNIVERSITY OF SHUMEN, SHUMEN 9712, 115, UNIVERSITETSKA STR.
Anton Popov UNIVERSITY "PROF. DR. ASSEN ZLATAROV" – BURGAS, 8000, BURGAS, BULGARIA
Pencho Kyurkchiev KONSTANTIN PRESLAVSKI UNIVERSITY OF SHUMEN, SHUMEN 9712, 115, UNIVERSITETSKA STR.
Lyubomira Veleva PAUL SCHERRER INSTITUTE, NUCLEAR ENERGY AND SAFETY DEPARTMENT, SWITZERLAND

DOI:

https://doi.org/10.46687/jsar.v4i1.103

Keywords:

poly (ethylene terephthalate), amorphous filaments, linear heating, tensile stress, extension, heat mechanical treatment, structure development, WAXS

Abstract

Amorphous poly (ethylene terephthalate) (PET) yarns were used as precursor specimens. The aim of the present experiment is to investigate the heat mechanically induced structural changes in the studied samples. The thermal deformation experiments were carried out on conditions of linear samples heating from room temperature up to 2000C while they were subjected to a well-defined constant strain force. Using of wide angle X-ray scattering (WAXS) and differential scanning calorimetry (DSC) methods ware investigated the structural rearrangements in the studied samples caused by the fibers drawing. Dependences between the parameters of the thermal deformation experiment and the running in the specimen’s structure development are established.

Author Biographies

Valentin Velev, KONSTANTIN PRESLAVSKI UNIVERSITY OF SHUMEN, SHUMEN 9712, 115, UNIVERSITETSKA STR.

KONSTANTIN PRESLAVSKI UNIVERSITY OF SHUMEN, SHUMEN 9712, 115, UNIVERSITETSKA STR.

Anton Popov, UNIVERSITY "PROF. DR. ASSEN ZLATAROV" – BURGAS, 8000, BURGAS, BULGARIA

UNIVERSITY "PROF. DR. ASSEN ZLATAROV" – BURGAS, 8000, BURGAS, BULGARIA

Pencho Kyurkchiev, KONSTANTIN PRESLAVSKI UNIVERSITY OF SHUMEN, SHUMEN 9712, 115, UNIVERSITETSKA STR.

KONSTANTIN PRESLAVSKI UNIVERSITY OF SHUMEN, SHUMEN 9712, 115, UNIVERSITETSKA STR.

Lyubomira Veleva, PAUL SCHERRER INSTITUTE, NUCLEAR ENERGY AND SAFETY DEPARTMENT, SWITZERLAND

PAUL SCHERRER INSTITUTE, NUCLEAR ENERGY AND SAFETY DEPARTMENT, SWITZERLAND

THERMO-MECHANICAL MODIFICATION OF AMORPHOUS POLYESTER FIBRES: III. STRUCTURE INVESTIGATIONS USING WIDE ANGLE X-RAY SCATTERING