利用奈米壓痕探討含奈米碳管水膠及PDMS之機械性質

THE MECHANICAL PROPERTIES OF HYDROGEL WITH CNTS AND PDMS BY NANOINDENTATION

王宗裕(Tsung-Yu Wang)

指導教授 ： 魏哲弘

大同大學/工程學院/機械工程學系所/碩士(2011年)

摘要

本論文探討含奈米碳管水膠和聚二甲基矽氧烷(polydimethylsiloxane簡稱PDMS)在奈米壓痕測試下，加載速率以及最大負載的不同，所測得的硬度及楊氏係數的變化，發現在加載速率越低時，水膠和PDMS的硬度和楊氏係數會提高，而在最大負載越大時，水膠的硬度和楊氏係數則是顯示上升的趨勢，而PDMS則是下降的趨勢，另外測量了矽晶片作為比較，發現矽晶片不論在加載速率或是最大負載的改變，強度都沒有明顯的變化。使用電子式掃描顯微鏡(SEM)觀察水膠以及PDMS在進行壓痕前後所造成的影響。觀測的結果看出測試試件在奈米壓痕後，水膠在受到壓痕測試最大負載10mN時，材料表面出現裂痕，而PDMS在受到壓痕測試不同最大負載10、20、30mN時，表面都出現了裂痕，最大負載越小，所觀測到的裂痕越大。

關鍵字

楊氏係數 ； 硬度 ； 含奈米碳管水膠 ； 聚二甲基矽氧烷 ； 奈米壓痕

並列摘要

The mechanical properties elastic modulus and hardness of soft materials such as CNTs doped hydrogel and PDMS are investigated via nanoindentation. These properties are dependent on the loading rate as well as the maximum load due to the viscoelastic nature. Both effects have different impact on the mechanical properties. For lower loading rate, the hardness and elastic modulus of CNTs doped hydrogel and PDMS are greater than those of higher loading rate. However, the elastic modulus and hardness is proportional to the maximum loading for hydrogel but is inverse proportional to the maximum for PDMS. The loading rate and maximum effects are investigated in silicon and they are insignificant. The effects of indentation on the morphology are examined via SEM. The results show that CNTs doped hydrogel are less prone to cracking. The cracks exhibit when the maximum load is 10 mN. On the other hand, PDMS are more prone to cracking by indentation. The cracks on PDMS exhibit when the maximum loading are 10 mN – 30 mN

並列關鍵字

elastic modulus ； hydrogel ； PDMS ； nanoindentation ； hardness

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