TAILIEUCHUNG - Thermodynamics Systems in Equilibrium and Non Equilibrium Part 5

Tham khảo tài liệu 'thermodynamics systems in equilibrium and non equilibrium part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 90 Thermodynamics - Systems in Equilibrium and Non-Equilibrium relaxation and phase transitions in PET fibers. In some of them as-spun filaments are subjected to thermal treatment at constant temperatures without stress Betchev 1995 Bai et al. 2000 as well with application of tensile force Zhang et al. 2004 Sharma et al. 1997 . Important is the answer of the question on what schemes and under what conditions should be conducted SHMM to maximize the orientation effect at the expense of minimal object destruction at high temperature uni-axial deformation. To obtain definite answer to a similar question is necessary a multifactorial planning and carrying out of massive diverse experiment. The preliminary suggestive for a range of the possible conditions of withdrawal experiments are impressive much. For initial approbation of the behavior of the specific object to the complex SHMM we accepted the technologically real and maximum possible temperature interval from 20 0C to 200 0C and sufficient as a beginning a range of orientation tensions from 0 MPa to MPa with enough good resolution of MPa. The experiment was carried out in combination of gravitational loading of the samples at a linear heating in line with the coefficient of fibers thermal conductivity average heating rate of 0C min. The dependence of the relative deformation from the tensile load values showed an initial intensive growth of the gradient of its increase up to strain stress value of MPa probably because of intensive destruction of macromolecular segments in the studied samples. A similar information was emitted and from the other performed structural analyses. The results led us to include new elements into the idea of the experiment and in particular to eliminate the adverse action of destructive tensions above those causing bundle deformation 290 . Results showed that above loading of MPa the relative samples elongation falls below the above mentioned value of the bundle .

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