臺灣博碩士論文加值系統

P(VDF-TrFE)聚(偏二氟乙烯-三氟乙烯)與P(VDF-TrFE-CTFE)聚(偏二氟乙烯-三氟乙烯-氯三氟乙烯)是常見的電活性高分子，分別具有較高的楊氏模數與較高的介電常數。利用同軸靜電紡絲技術，結合兩種聚合物，以獲得更好的互補特性。在本研究中，我們利用國家同步輻射中心台灣光子源(TLS)01C2實驗站進行即時性廣角X光繞射(in-situ WAXD)量測，研究壓電特性(正壓電和逆壓電效應)及施加電壓對材料晶格結構的影響。在不同頻率下，測量同軸殼/核複合電紡奈米纖維所得到的壓電響應。發現同軸殼/核複合電紡奈米纖維在幾個特定頻率下，表現出比單軸電紡製造的P(VDF-TrFE)和P(VDF-TrFE-CTFE)還要更好的壓電響應。

P(VDF-TrFE) poly(vinylidene fluoride-trifluoroethylene) and P(VDF-TrFE-CTFE) poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) are common electroactive polymers which have higher Young's modulus and higher dielectric constant, respectively. I applied coaxial electrospinning to combine these two polymers to develop the mixed polymers to tune their properties. My thesis research focuses on exploring piezoelectric properties, which are mainly direct and inverse piezoelectric effect, using the instruments of the National Synchrotron Radiation Research Center TLS01C2 station. I conducted in-situ Wide-angle X-ray Diffraction (WAXD) to simultaneously measure the changes in the microstructure, such as the lattice structure of the material, subjected to the applied voltage. Besides measuring the microstructure, I used the piezoelectric measurement equipment to measure the performance of piezoelectric response at the fixed force, which was 1 Newton, at different frequencies. I found that the piezoelectric properties of the coaxial core/shell composite electrospun nanofibers exhibited better piezoelectric responses than the pristine P(VDF-TrFE-CTFE) and P(VDF-TrFE) fabricated via the uniaxial electrospinning method at several specific frequencies.

誌謝 i
中文摘要 ii
英文摘要 iii
1 目錄 iv
2 圖目錄 vii
3 表目錄 x
1 第一章 前言 1
2 第二章 文獻回顧 3
2.1 壓電材料之發展 3
2.2 壓電效應 5
2.2.1 正壓電效應 5
2.2.2 逆壓電效應 6
2.2.3 壓電係數 7
2.3 電活性聚合物(Electroactive Polymer, EAP) 7
2.3.1 電活性聚合物之種類 7
2.3.2 電活性聚合物之性能 8
2.4 聚偏二氟乙烯(PVDF)共聚物之介紹 9
2.5 靜電紡絲製程介紹 12
2.5.1 靜電紡絲之特點 13
2.5.2 靜電紡絲之應用-同軸靜電紡絲 13
2.6 同步輻射X光散射實驗 14
2.6.1 X光繞射介紹 14
2.6.2 同步輻射光源介紹 15
2.6.3 廣角X光繞射介紹(Wide Angle X-ray Diffraction, WAXD) 16
3 第三章 實驗方法與儀器 17
3.1 實驗流程 17
3.2 實驗材料 17
3.3 樣品製備 18
3.3.1 單軸電紡製程 18
3.3.2 同軸電紡製程 19
3.3.3 壓電傳感器製程 20
3.4 微結構觀察 21
3.4.1 廣角X射線繞射儀 (Wide Angle X-ray Diffraction, WAXD) 21
3.4.2 即時性量測 21
3.5 壓電量測 22
3.6 纖維形貌觀察 24
3.7 薄膜厚度量測 24
3.8 d33量測系統(d33 meter) 25
4 第四章 實驗結果 26
4.1 表面微觀結構觀察 26
4.2 廣角X光繞射(WAXD)繞射峰分析 30
4.2.1 繞射位置(2 theta position)分析 32
4.2.2 晶格常數(Lattice constant)分析 34
4.2.3 晶格應變(Lattice strain)之分析 38
4.3 樣品厚度量測 39
4.4 單一樣品固定頻率下的壓電響應 41
4.5 單一樣品不同頻率下的壓電響應 42
4.6 四種樣品的壓電響應 43
5 第五章 結果討論 45
5.1 電紡製程之纖維異向性的有無 45
5.2 晶格應變之變化趨勢 46
5.3 四種樣品之晶格應變b比較 48
5.4 微觀與巨觀的逆壓電性質 50
5.5 四種樣品的壓電響應比較 51
6 第六章 結論 55
7 第七章 建議未來工作 56
8 第八章 參考文獻 57
9 第九章 附錄 60
9.1 口試委員的Q & A 60
9.2 簡歷 63
9.3 參加年會海報 64

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