施文彬Shih, Wen-Pin臺灣大學:機械工程學研究所葉丞家Yeh, Cheng-ChiaCheng-ChiaYeh2010-06-302018-06-282010-06-302018-06-282009U0001-3107200903103600http://ntur.lib.ntu.edu.tw//handle/246246/187220近年來，由於離子性聚合物金屬複合材料(ionic polymer-metal composites, IPMCs)具有大變形及低驅動電壓的特性，讓其在作為致動器的範疇中受到相當的注目。然而，因為離子性聚合物金屬複合材料驅動特性會受到該材料含水量多寡的影響，若於空氣中應用時，材料內的水分會隨時間散失，將會降低材料的致動性與反覆性。故本論文提出含水量對於離子性聚合物金屬複合材料驅動性能的影響。在兩小時交流電壓驅動測試下，伴隨材料含水量的減少，也同時量測離子性聚合物金屬複合材料的性能變化。經由不同初始含水量及不同電壓的測試，分析討論離子性聚合物金屬複合材料的驅動特性。而實驗結果顯示在含水量70%左右會有最大的變形量，且在不同的初始含水量下驅動，依初始含水量及驅動電壓不同，皆需要100到900秒不等的時間才能發揮較佳的性能。此外，我們發現電流的最大值與含水量之間有明顯的線性關係，當含水量下降時，電流的最大值會明顯上升。另一方面，本論文也透過靜電及應力分析提出力電水耦合的離子性聚合物金屬複合材料模型。Recently, there has been growing interest in actuators by using ionic polymer- metal composites (IPMCs) due to their attractive properties including large deformation and low driving voltage. However, when IPMCs operate in the air, water evaporation causes the worse performance and low durability because the performance of IPMCs depends on the water contents. Hence, this article presents the effects of water contents on actuation performance of IPMCs. In our experiments, IPMCs are actuated by AC voltage under 2 hours. Because the water molecules in IPMCs evaporate into the air, the change of the actuation performance of IPMCs with decreasing water contents is investigated. Meanwhile, we further discuss the actuation mechanism of IPMCs under the different initial water contents with the different applied voltages. In our results, it was found that the largest deformation of IPMCs is obtained under the water contents of ~70%. The amplitude of IPMCs requires 100~900sec to reach the maximum of value under the different applied voltage and initial water contents. A linear relation between the peak value of current and the water contents is also presented. In addition, the hydrological-mechanical-electrical coupling model for deflection of IPMCs is also successfully investigated by electrostatic analysis and stress analysis.誌謝 IIbstract III要 IVontents Vist of Figures VIIist of Tables XIist of Symbols XIIhapter 1 Introduction 1.1 Background 1.2 Overview of IPMCs 3.2.1 Brief history 3.2.2 Working principle 5.2.3 General manufacture methods of IPMCs 9.2.4 Improvement 10.3 Motivation 13.4 Purpose of research 16hapter 2 Modeling of IPMCs 18.1 Introduction 18.2 Review of the modeling focused on the hydration 19.2.1 Cluster-network model 19.2.2 Current mathematical analysis for IPMC modeling 22.3 Theoretical derivation of IPMCs deformation 25.3.1 Electrostatic analysis 26.3.2 Hydration analysis (stress analysis) 32.3.3 Discussions 35.4 Summary 40hapter 3 Experiments 42.1 Fabrication of samples 42.2 Experimental setup 46.3 Technique of measurement 50.4 Actuation method 54hapter 4 Results and Discussions 56.1 Introduction 56.2 Experimental results 57.2.1 Amplitude 57.2.2 Current 65.3 Further discussions 71.3.1 Amplitude 71.3.2 Current 76.4 Summary 79hapter 5 Conclusions and Future Work 80.1 Conclusions 80.2 Future work 82eferences 83ppendix A Suppressing Water Evaporation by Coating Thin Layer 88ppendix B Effect of Evaporation Rate on Actuation Performance of IPMCs 91en-US離子性聚合物金屬複合材料含水量水分散失理論模型電致動高分子Ionic polymer-metal compositesIPMCswater contentsevaporationmodelingelectroactive polymerNafionthesis