2. Of poly(hexamethylene adipamide) and poly(hexamethylene adipate), which polymer would be better used for cloth? Why? (10%)

1. Please explain, in details, two of the following materials fields: (1) high-entropy alloy, (2) gradient materials, (3) MRAM, (4) 2D materials, and (5) quantum materials. (10%)

3. A crystalline polymer was stretched several hundred % at room temperature (RT). X-ray diffraction spectrum was acquired while held under tension. When the sample was released, the polymer retracted and diffraction peaks disappeared. Explain this phenomenon, especially with consideration of relationship between Tm and RT. (10%)

4. Sketch crystal structure of BaTiO3, Al2O3, and Zr02. (10%)

5. Please list, as least, four methods to improve fracture strength of ceramic materials. (10%)

6. Why is Si-Ge proposed to be promising semi-conductor materials? Please answer this question in English only.(10%)

(a)

(b)

(c)

110年 - 110 國立臺灣大學_碩士班招生考試_材料科學與工程學系國際應用材料工程研究所:材料工程學(含材料科學導論、材料熱力學)#100774