WAXS studies of heat - mechanically modified amorphous PET fibers. Role of the tensile stress

18th International School on Condensed Matter Physics: "Challenges of Nanoscale Science: Theory, Materials, Applications"

Velev, V.^1 ; Popov, A.^2 ; Kyurkchiev, P.^1 ; Veleva, L.^3 ; Pencheva, M.^1

Konstantin Preslavsky University, 115 Universitetska Street, Shumen

9700, Bulgaria^1

University Prof. Dr. Assen Zlatarov, 1 Prof. Jakimov Street, Burgas

8000, Bulgaria^2

Paul Scherrer Institute, Nuclear Energy and Safety Department, Villigen

5232, Switzerland^3

关键词: Constant temperature;    Degree of crystallinity;    Isothermal conditions;    Mechanical loads;    Poly(ethylene terephthalate) (PET);    Structural rearrangement;    Structure development;    Thermal deformation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/558/1/012051/pdf
DOI  :  10.1088/1742-6596/558/1/012051

来源: IOP

【 摘 要 】

The present work is devoted to the investigation of the structure developments in as- spun amorphous poly (ethylene terephthalate) (PET) filaments occurred as a result of heat mechanically modification. The degree of crystallinity of the untreated samples was 1,7 %. The thermal deformation experiments were carried out under isothermal conditions. PET yarn was annealed during 10 min at constant temperature of 80°C after which the sample is subjected to a well-defined constant tensile stress for 120 s at the same temperature. The mechanical load is gravitationally in the range from 0 MPa to 30 MPa and with increment step of 3 MPa. Using of wide angle X-ray scattering (WAXS) were investigated the structural rearrangements in the studied samples caused by the fibers treatments. Dependences between the strain force values and the running in the specimen's structure development are established. And in particular, it was found that a small increase of the tensile stress from 3 MPa to 6 MPa leads to a massive increase in the fibers degree of crystallinity with more than 33%.