scholarly journals CHARACTERISTICS OF STRAIN-INDUCED CRYSTALLIZATION IN NATURAL RUBBER DURING FATIGUE TESTING: IN SITU WIDE-ANGLE X-RAY DIFFRACTION MEASUREMENTS USING SYNCHROTRON RADIATION

2014 ◽  
Vol 87 (1) ◽  
pp. 184-196 ◽  
Author(s):  
S. Beurrot-Borgarino ◽  
B. Huneau ◽  
E. Verron ◽  
D. Thiaudière ◽  
C. Mocuta ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Stretch Ratio ◽  
Fatigue Tests ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Strain Induced Crystallization ◽  
Number Of Cycles ◽  
Induced Crystallization

ABSTRACT Strain-induced crystallization of carbon black-filled natural rubber is investigated by wide-angle X-ray diffraction (WAXD) during in situ fatigue tests using synchrotron radiation. Thanks to an original experimental method, we measure the evolution with the number of cycles of: (i) the index of crystallinity, both (ii) size and (iii) orientation of the crystallites, and finally (iv) the lattice parameters. It is shown that when the minimum stretch ratio of the fatigue test is lower than the onset of melting of the crystallites, then the index of crystallinity and the size of the crystallites decrease, whereas they increase when the minimum stretch ratio is higher than the onset of melting. For all the fatigue tests, the misorientation of the crystallites slightly decreases and the lattice parameters remain constant with the number of cycles.

In situ characterization of strain-induced crystallization of natural rubber by synchrotron radiation wide-angle X-ray diffraction: construction of a crystal network at low temperatures

Soft Matter ◽  
2019 ◽  
Vol 15 (4) ◽  
pp. 734-743 ◽  
Author(s):  
Pinzhang Chen ◽  
Jingyun Zhao ◽  
Yuanfei Lin ◽  
Jiarui Chang ◽  
Lingpu Meng ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Structural Evolution ◽  
X Ray Diffraction ◽  
In Situ Characterization ◽  
X Ray ◽  
Crystal Network ◽  
Strain Induced Crystallization ◽  
Induced Crystallization

The structural evolution of NR during stretching at −40 °C and in the strain–temperature space.

Probing the Nature of Strain-Induced Crystallization in Polyisoprene Rubber by Combined Thermomechanical and In Situ X-ray Diffraction Techniques

2005 ◽  
Vol 38 (16) ◽  
pp. 7064-7073 ◽  
Author(s):  
Shigeyuki Toki ◽  
Igors Sics ◽  
Benjamin S. Hsiao ◽  
Masatoshi Tosaka ◽  
Sirilux Poompradub ◽  
...  
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Strain Induced Crystallization ◽  
Induced Crystallization

Effect of Network-Chain Length on Strain-Induced Crystallization of NR and IR Vulcanizates

2004 ◽  
Vol 77 (4) ◽  
pp. 711-723 ◽  
Author(s):  
Masatoshi Tosaka ◽  
Shinzo Kohjiya ◽  
Syozo Murakami ◽  
Sirilux Poompradub ◽  
Yuko Ikeda ◽  
...  
Keyword(s):  
Small Strain ◽  
Crosslinking Density ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
Elongation Ratio ◽  
Network Chain ◽  
X Ray ◽  
Strain Induced Crystallization ◽  
Induced Crystallization ◽  
Isoprene Rubber

Abstract Strain-induced crystallization of natural rubber (NR) and synthetic isoprene rubber (IR) with various crosslinking densities was investigated by wide angle X-ray diffraction using a synchrotron radiation and simultaneous tensile measurements. The elongation ratio at the onset of crystallization (αc) was almost independent of crosslinking density. IR samples showed larger αc values than NR because of the lower stereoregularity of IR. These results suggest that the onset of crystallization is determined by increased melting temperature by strain due to an entropic reason. The amount of oriented amorphous component changed approximately linearly with strain, and was a little larger in IR than in NR when compared at the same elongation ratio. At small strain (and stress), crystallinity in IR was lower than in NR. These results indicate that, at small strain region, the more stress is assigned to oriented amorphous in IR than in NR.

New insights into reinforcement mechanism of nanoclay-filled isoprene rubber during uniaxial deformation by in situ synchrotron X-ray diffraction

RSC Advances ◽  
2015 ◽  
Vol 5 (32) ◽  
pp. 25171-25182 ◽  
Author(s):  
Xuan Fu ◽  
Guangsu Huang ◽  
Zhengtian Xie ◽  
Wang Xing
Keyword(s):  
Crystallization Behavior ◽  
Vital Role ◽  
Uniaxial Deformation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Reinforcement Mechanism ◽  
Strain Induced Crystallization ◽  
Induced Crystallization ◽  
Isoprene Rubber

The existence of a denser network domain formed by incorporation of filler and its vital role in determining the strain-induced crystallization behavior of nanocomposites is proved by in situ synchrotron X-ray diffraction characterization.

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