臺灣博碩士論文加值系統

本論文研究以近場靜電紡絲技術（Near-field electrospinning）為基礎，由聚偏氟乙烯（Polyvinylidene fluoride, PVDF）與聚谷氨酸甲酯 [Poly（γ-methyl l-glutamate）, PMLG] / PVDF複合溶液的重量百分比、黏度、電導度與接觸角相互關係中，使用最佳參數配合滾動收集設備製作出具有壓電特性之纖維。將製作出之壓電纖維結合指叉電極結構，施予高電場進行再極化處理，進而有效提升壓電纖維之機電轉換率。研究過程中利用PVDF與PMLG/PVDF複合壓電纖維貼附於撓性基板（聚對苯二甲酸乙二酯Polyethylene terephthalate，PET）指叉電極結構之上，該結構之間距為0.2~1 mm。實驗結果顯示 PVDF溶液在重量百分比18 wt%時，電導度為43.9 μs/cm，接觸角為31.25°，經電紡後可獲得0.97-4.1 μm壓電纖維；而PMLG/PVDF溶液在重量百分比30.69 wt%時，電導度為55.2 μs/cm情況，接觸角為54.47°，經電紡後可獲得7.11-17.3 μm壓電纖維。再施以1.6×107 V/m電場並分別加熱35°C與65°C進行再極化處理，再將此指叉電極結構施予一固定頻率（8 Hz）拍打並進行量測。研究發現PMLG/PVDF複合壓電纖維能產生0.191 V 開路電壓與720 nA 閉路電流；與PVDF相較之下做成的能源擷取裝置有1.2-1.8倍的提升，且相較於未再極化之傳統平行電極輸出的電壓與電流，擁有77%以上的轉換效率提升。雖然此材料比PVDF擁有較高的電性表現，但PMLG/PVDF複合壓電纖維具有脆性容易損壞，故本論文選用PVDF纖維作為後續的運用。最後使用放電加工製作0.2 mm的模具，以聚二甲基矽氧烷（PDMS）翻模而成的PDMS軟性結構以轉印方式塗佈銀膠，使PDMS上的指叉式電極結構具有導電性，鋪上PVDF纖維後封裝成智能貼片，此智能貼片相較於PET貼片擁有較好的電性輸出。最後將此利用陣列方式，針對行動不便與久臥於病床上的患者進行大面積感測。

This thesis is based on near-field electrospinning technique, from the interaction between solution weight percent, viscosity, electrical conductivity and contact angle of （Polyvinylidene fluoride, PVDF） and [Poly（γ-methyl l-glutamate）, PMLG]/PVDF composite solution. Use the best parameters to produce the piezoelectric fibers by rolling collection device. The piezoelectric fibers are placed on the interdigitated electrode structure, and a high electric field is applied to re-polarization the sample that could enhance the electromechanical conversion rates of piezoelectric fibers significantly. PVDF and PMLG / PVDF piezoelectric composite fiber is pasted on flexible PET substrate with interdigitated electrode structure, and the gap of structure is between 0.2 mm and 1mm. The experimental result shows that while the weight percentage of PVDF solution is 18 wt%, conductivity is 43.9 μs/cm, contact angle is 31.25°; and piezoelectric fiber with 0.95-4.1μm diameter can be produced by electrospinning. While the weight percentage of PMLG/PVDF solution is 30.69%, conductivity is 55.2 μs/cm and conductivity is 54.47°, the diameter of piezoelectric fiber is 7.11-17.3 μm. A 1.6×107 V/m electric field is set to re-polarization the piezoelectric fibers at 35°C and 65°C respectively, and a vibration with fixed frequency (8 Hz) is given to structure. According to the measurement results, PMLG / PVDF piezoelectric composite fiber could produce 0.191 V open circuit voltage and 720 nA closed current; which is 1.2-1.8 times higher than the energy harvester made by PVDF, and the conversion rate is increased by 77% comparing with the un-polarization traditional parallel electrode. Although the electrical performance of PMLG/PVDF piezoelectric composite fiber is higher than PVDF piezoelectric fiber, the fiber made by PMLG/PVDF will break easily because of the brittleness of material, that’s the main reason we choose PVDF fiber for further application. Electrical discharge machining process is used to fabricate the mold with 0.2 mm gap, and silver plastic is transfer printed on the flexible PDMS structure, that makes interdigitated electrode structure have conductivity. PVDF fiber is placed on the interdigitated electrode structure and packaged as a smart patch, the electric output of smart patch is higher then the one on PET patch. The PVDF fiber smart patch is arranged in array as a wide area detector for patient who is unable to move freely.

目錄
第一章 緒論 1
1-1 前言 1
1-2 研究背景與動機 2
1-3 研究目的 4
第二章 文獻回顧 5
2-1壓電原理 5
2-1-1正壓電效應 7
2-1-2逆壓電效應 8
2-1-3極化處理 9
2-1-4壓電訊號 10
2-2 壓電操作模式 11
2-3壓電材料的種類 12
2-4 PVDF壓電材料之特性與相關研究 13
2-5 PMLG壓電材料之特性與相關研究 15
2-6靜電紡絲製程 17
2-7環境對電紡參數的影響 26
第三章 研究方法 28
3-1 PVDF&;PMLG /PVDF先驅溶液調配流程 29
3-1-1相關材料準備 29
3-1-2調配先驅溶液 31
3-2近場靜電紡製程與原理 34
3-3近場靜電紡絲之設備 35
3-4能量擷取裝置製作與設計 39
3-4-1指叉式電極貼片 （PET）製作 40
3-4-2指叉式電極貼片 （PDMS智能貼片）製作 46
3-5實驗用儀器 55
第四章 結果與討論 65
4-1先驅溶液電導率量測 65
4-2先驅溶液黏度量測 67
4-3先驅溶液接觸角量測 69
4-4先驅溶液濃度與線徑之關係 71
4-5指叉式電極貼片 （PET）量測靜態阻抗 80
4-6壓電纖維再極化 （指叉式PET電極貼片） 82
4-7指叉式PET電極貼片電性量測 85
4-8固定頻率電壓、應變、電流量測分析 97
4-9 PVDF與PMLG/PVDF兩種電紡纖維之比較 102
4-10指叉式電極貼片之量測 （PDMS智能貼片） 105
4-11 ANSYS 109
4-12 PET指叉式電極貼片與PDMS智能貼片之比較 112
4-13 PDMS智能貼片可靠度測試 114
4-14脊髓損傷患者臀部受力與溫度檢測 118
第五章 結論及未來展望 121
5-1 結論 121
5-2未來展望 123
參考文獻 124

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