Question

question about XRD and miller index

how to solve question number 7??

4. (1) Describe the purpose of using a tire code. Explain type and structure of the tire code. Also explain how to improve the adhesion between rubber and tire code and why it is important. [20] (2) Conventional tires are usually composited with carbon black (CB) particles. Explain why the size of CB particles and network structure of CB particles are important to improve the mechanical properties of the tire. [15] 5. Explain thermodynamically how fiber polymers can be crystallized. [20] 6. List up factors enhancing polymer crystallization. Describe how each factor affects the crystallization in detail. [25] 7. The below figure is the X-ray diffraction results of polyethylene before and after drawing. Polyethylene crystal is known to have orthorhombic structure. Please calculate the length a, b, and c" of unit cell for x, y, and z axes, respectively. Calculate the "d-spacing” of crystal planes of (110) (310). (220). Estimate the exact peak positions of crystal planes of (110). (310). (220) according to Bragg's law. (The wave length of X-ray is 0.154 nm.) (25) (110) (002) stretched - reference new peak 24.0 (200) 36.3° (020) Intensity (a.u.) (310) (220) 20 25 30 40 @ 2/2 5 20 (Degree)

Answer 1

Solp Oth077mic k2 + + 2 of =B-90 need not inctuabea) ON4 n S4 7ID m 200 plane 26=24 C=12 297n0 291n 12 0.370 ) + ( 2,0,0) 4 af 2 0.74 nm 7.4 A 18.15 d o.247 be2d 29 26 3 0-494 49A 2-74.3 0-37.15 d 0.17 nm a 7.A - 494AC 25t A

d-spaing Calertabim 2 be4.9A レレ) じ= 24404 c64516 Ce2.54 92 2 +D 4516 54.76 2440 na=2d ne =9.16 1336. 194 Sivo= 1 .54 A 2X4.209 A ne o188 Similery 10.836 2e 2x1D826 2-1.6 1 d2 S476 24 40 2.20 4 1.596 Sine =2d 2x2-20月 20.5 4 20=41 70 24 40 54.76 2-054 1.54 A 2x2.DS A 2e=44

E Katt Peak posib'o 2 (4020-4.109 4 3,1,0) 1-2-201 4-1 cE2.0sA 44