Intrafibrillar bridging structures in strained isotactic polypropylene

Tsobkallo, Katherina

doi:10.1016/s0032-3861(03)01215-1

Cited by 1 publication

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“…The relationship between E i and ϵ p showed that E i did not depend on the adjusted ϵ p and became around 6.5 GPa. This result drew our attention because, for many polymers, extension leads to an increase in the initial rigidity due to orientation processes 15–17. Another interesting result, as shown in Figure 5, was the increase of the average value of E y in the second deformation region after the application of preliminary stretching.…”

Section: Resultsmentioning

confidence: 82%

“…This result drew our attention because, for many polymers, extension leads to an increase in the initial rigidity due to orientation processes. [15][16][17] Another interesting result, as shown in Figure 5, was the increase of the average value of E y in the second deformation region after the application of preliminary stretching. Although e p increased up to about 16%, E y increased slightly, but beyond this value, it increased sharply.…”

Section: E170mentioning

confidence: 80%

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Analysis of the contribution of the microfibrils and matrix to the deformation processes in wool fibers

Tsobkallo

Aksakal

Darvish

2012

J of Applied Polymer Sci

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In this study, the mechanical and structural characteristics of wool fibers were examined, and the contributions of the microfibrils and matrix to the deformation processes were analyzed. The experiments were carried out on single wool fibers. To understand the structural changes at different deformation levels, the wool fibers were treated with a complex mechanical regime. One of the most significant results from the mechanical tests was the estimation of the modulus of the matrix, which changed from 0.07 to 1.6 GPa during stretching. This result proves the proposal of the netlike structure of the matrix. On the basis of the obtained experimental data and the structural model, where the microfibrils and matrix play the role of a reinforcing phase and a filler, respectively, the rigidity of the microfibrils in the initial unstretched state was determined to be equal to about 20 GPa. The experimental data obtained from the Fourier transform infrared–attenuated total reflectance spectroscopy method proved the α–β conformational transition both in the yield and postyield regions and revealed the presence of the stable β form, which was not sensitive to stretching. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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Section: Resultsmentioning

confidence: 82%

Section: E170mentioning

confidence: 80%