THERMO-MECHANICALLY MODIFICATION OF AMORPHOUS POLYESTER FIBRES: ІІ. CALORIMETRIC INVESTIGATIONS: THERMO-MECHANICALLY MODIFICATION OF AMORPHOUS POLYESTER FIBRES: ІІ. CALORIMETRIC INVESTIGATIONS

Valentin  Velev; Anton  Popov; Pencho  Kyurkchiev; Lyubomira  Veleva; Rusalia  Mateva

doi:10.46687/jsar.v4i1.102

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

DOI:

https://doi.org/10.46687/jsar.v4i1.102

Keywords:

poly (ethylene terephthalate), filaments, heat - mechanical treatment, tensile stress, strain-induced crystallization, differential scanning calorimetry

Abstract

The present work is devoted to the investigation of the structure developments in as-spun amorphous poly (ethylene terephthalate) (PET) occurred as a result of heat mechanical treatments. The deformation behavior of as-spun amorphous poly (ethylene terephthalate) (PET) yarns subjected to simultaneous thermal and mechanical treatments has been studied. It was found that the applied tensile force simultaneously with the linear heating of the studied PET yarns strongly affects the samples deformation behaviour. Differential scanning calorimetry (DSC) has been used to study the structural rearrangements in the thermo-mechanically processed PET fibers occurred as a result of the treatment structural changes. Have been established dependencies between the parameters of the thermal deformation experiment and occurred in the samples structural changes.

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

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

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

THERMO-MECHANICALLY MODIFICATION OF AMORPHOUS POLYESTER FIBRES: ІІ. CALORIMETRIC INVESTIGATIONS