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DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 邱文英(Wen-Yen Chiu) | |
dc.contributor.author | Guan-Ting Lin | en |
dc.contributor.author | 林冠廷 | zh_TW |
dc.date.accessioned | 2021-07-10T21:34:40Z | - |
dc.date.available | 2021-07-10T21:34:40Z | - |
dc.date.copyright | 2016-10-26 | |
dc.date.issued | 2016 | |
dc.date.submitted | 2016-08-19 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76661 | - |
dc.description.abstract | 本研究利用單軸與同軸雙層靜電紡絲技術製備溫感性導電複合纖維材料,研究中所使用材料有二。其一為具溫感性之熱交聯型共聚物poly(N-isopropylacrylamide-co-N-methylolacrylamide) (PNN),係以氧化還原起始劑誘發自由基聚合反應方式合成。其二為具可撓性並導入熱交聯單體形成之poly(styrene-co-N-butyl acrylate-co-N-methylolacrylamide) (PSBN)共聚物,同樣係以氧化還原起始劑誘發乳化聚合反應方式合成。
本研究首先探討PNN/H2O作為內軸電紡液,PNN/PEDOT:PSS/H2O作為外軸電紡液下製備之同軸雙層靜電紡絲纖維。順向性纖維係以高速滾輪收集,並將收集之纖維膜施以熱交聯與摻雜DMSO處理。其後將PNN/H2O與PNN/PSBN/H2O等溶液作為「含浸液」,預期進一步製備異方性導電膜。隨後改變內、外軸之電紡液配方,並在電紡液中加入PSBN共聚物,預期增加複合纖維的可撓性質。研究最後並比較單軸與同軸雙層靜電紡絲技術製備下,其纖維於導電性、溫度敏感特性及可撓性之表現差異。 實驗中,藉由掃描式電子顯微鏡下觀察收集之纖維型態來獲取最佳靜電紡絲參數。纖維膜之溶脹比率與表面電組隨著溫度增加而減少,係因纖維其一組成成分PNN為一溫感性高分子,在升溫過程中其結構會逐漸捲曲之緣故。含浸過程中,纖維膜於兩正交方向(其一為平行滾輪收集方向,另一為垂直滾輪方向)之電阻與兩方向之電阻差異,皆隨含浸次數增加而漸次增加。兩正交方向電阻之趨勢變化於纖維膜可撓性測試同樣可見。 進一步,利用同軸雙層靜電紡絲技術及手動之高速滾輪裝置,可收集並置備內軸組成成分為PNN/PSBN,外軸組成成分為PNN/PEDOT之芯鞘型導電性複合纖維,輔以含浸於PNN/PSBN/H2O含浸液之方式,可成功製備在兩正交方向電 阻差異達到約兩個級數之異方性複合導電膜,並期許成為應用於感測器之新穎材料。 | zh_TW |
dc.description.abstract | In this research, thermo-responsive conductive fiber mats were fabricated via single jet electrospinning and coaxial electrospinning. The thermal cross-linkable and thermo-responsive copolymer, poly(N-isopropylacrylamide-co-N-methylolacrylamide) (PNN), was synthesized by free-radical polymerization with redox pair as initiators. On the other hand, the thermal cross-linkable and flexible copolymer, poly(styrene-co-N-butyl acrylate-co-N-methylolacrylamide) (PSBN), was synthesized via emulsion polymerization with redox pair as initiators as well.
First of all, PNN/H2O was used as the core solution and PNN/PEDOT:PSS/H2O as the sheath solution. The sheath/core fibers were produced via coaxial electrospinning. To collect aligned fibers, a rotating drum is used as the collector throughout the entire electrospinning process. The sheath/core fiber mats were obtained after thermal cross-linking and doping in DMSO. PNN/H2O and PNN/PSBN/H2O two kinds of solutions were then dipped onto the fiber mats to fabricate anisotropically conductive fiber mats, which was called an impregnation process in this study. Next, the compositions of core solution and sheath solution were changed. Moreover, PSBN copolymer was introduced into the electrospinning solutions to produce fibers with good flexibility. Last, fibers generated via single electrospinning were compared with those via co-axial electrospinning. Electrospinning processing parameters were determined by the morphology of the fibers under SEM. Swelling ratios and thermo-responsive conductive properties of the fibers mats decreased with increasing temperature because PNN experienced coil-to-globule transition. Two orthogonal directions of each fiber mat (one parallel and the other perpendicular to rotating drum) exhibited increasing resistance, and the resistance ratio of two directions increased with increasing numbers of impregnation cycle. In the bending test, two orthogonal directions of each fiber mat exhibited increasing surface resistance with increasing numbers of bending cycle as well. By using a moving rotating drum and PNN/PSBN/H2O as an impregnation solution, the anisotropically conductive (sheath/core) (PNN/PEDOT)/(PNN/PSBN) fiber mat with two orders of magnitude in two orthogonal directions was successfully fabricated, which could be a potential material for thermo- and bio-sensors. | en |
dc.description.provenance | Made available in DSpace on 2021-07-10T21:34:40Z (GMT). No. of bitstreams: 1 ntu-105-R03524022-1.pdf: 6676777 bytes, checksum: d1fef10371e39844ad5eb3a960871f0d (MD5) Previous issue date: 2016 | en |
dc.description.tableofcontents | Acknowledgement..........................................................................................................I
摘要...............................................................................................................................II Abstract........................................................................................................................IV Contents......................................................................................................................VI List of Tables.................................................................................................................X List of Figures..............................................................................................................XI Chapter 1 Preface...........................................................................................................1 Chapter 2 Introduction...................................................................................................2 2-1 Introduction of thermo-responsive polymer: Poly(N-isopropylacrylamide) (PNIPAAm) ...................................................................................................2 2-1.1 Stimuli-responsive polymers................................................................2 2-1.2 LCST Polymer: Poly(N-isopropylacrylamide) ...................................3 2-2 Introduction of conductive polymer: Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) .........................................................16 2-3 Electrospinning.............................................................................................19 2-3.1 Development of electrospinning........................................................19 2-3.2 Fundamental principles of electrospinning........................................21 2-3.3 Parameters in electrospinning............................................................24 2-3.3.1 Polymer solution concentration............................................24 2-3.3.2 Polymer solution conductivity.............................................26 2-3.3.3 Voltage.................................................................................27 2-3.3.4 Working distance.................................................................28 2-3.3.5 Injection rate.........................................................................29 2-3.3.6 Ambient parameters.............................................................30 2-3.4 Coaxial electrospinning......................................................................32 2-3.5 Electrospinning of continuous aligned fibers.....................................35 2-3.6 Applications of electrospinning.........................................................36 2-4 Emulsion polymerization..............................................................................37 2-4.1 Introduction of emulsions..................................................................37 2-4.2 Fundamental principles of emulsion polymerization.........................37 2-4.3 Conventional emulsion polymerization with redox initiator..............39 2-4.4 Applications of emulsion polymers...................................................40 2-5 Motivation of this study................................................................................40 Chapter 3 Experimental................................................................................................46 3-1 Materials.......................................................................................................46 3-2 Preparation of poly(N-isopropylacrylamide-co-N-methylolacrylamide) (PNN) random copolymer............................................................................46 3-3 Preparation of poly(styrene-co-n-butyl acrylate-co-N-methylolacrylamide) (PSBN) random copolymer..........................................................................47 3-4 Preparation of fiber via single jet electrospinning........................................47 3-4.1 PNN/PEDOT:PSS/H2O .....................................................................48 3-4.2 PNN/PSBN/PEDOT:PSS/H2O...........................................................48 3-5 Preparation of fiber with sheath-core structure via coaxial electrospinning ......................................................................................................................49 3-5.1 Sheath: PNN/PEDOT:PSS/H2O; Core: PNN/H2O.............................49 3-5.2 Sheath: PNN/H2O; Core: PNN/PEDOT:PSS/H2O.............................50 3-5.3 Sheath: PNN/PSBN/H2O; Core: PNN/PEDOT:PSS/H2O..................50 3-5.4 Sheath: PNN/PEDOT:PSS/H2O; Core: PNN/PSBN/H2O..................50 3-6 Preparation of conductive fiber mats............................................................51 3-7 Preparation of anisotropically conducive fiber mats....................................53 3-8 Characterization............................................................................................53 3-8.1 Polymer characterization....................................................................53 3-8.1.1 Gel permeation chromatography (GPC) ..............................53 3-8.1.2 Nuclear magnetic resonance (NMR) ...................................54 3-8.1.3 Monomer conversion in synthesis of PSBN copolymer.......54 3-8.1.4 Differential scanning calorimetry (DSC) ............................54 3-8.1.5 Dynamic light scattering (DLS) measurements...................55 3-8.2 Viscosities of the spinning solutions..................................................55 3-8.3 Charge couple device (CCD) ............................................................55 3-8.4 Fiber morphology...............................................................................56 3-8.4.1 Field emission scanning electron microscope (SEM) .........56 3-8.5 Physical and mechanical properties of fiber mats..............................56 3-8.5.1 Gel fraction and swelling ratio of fiber mats........................56 3-8.5.2 Roughness of fiber mats.......................................................57 3-8.5.2 Porosities of fiber mats.........................................................57 3-8.5.3 Conductivity and surface resistivity of fiber mats................58 3-8.5.4 Thermo-responsive properties of fiber mats........................60 3-8.5.5 Flexibility of fiber mats........................................................61 3-9 Flow chart of this study................................................................................62 Chapter 4 Results and Discussion................................................................................67 4-1 Characterizations of PNN copolymer..........................................................67 4-2 Characterizations of PSBN copolymer........................................................68 4-3 Electrospun fiber mats..................................................................................69 4-3.1 Non-woven electrospun fiber mats via single jet electrospinning.....70 4-3.2 Non-woven electrospun fiber mats via coaxial electrospinning........70 4-3.3 Fiber orientation anisotropy...............................................................71 4-4 Characterizations of fiber mats.....................................................................72 4-4.1 Conductivity and surface resistivity of fiber mats.............................73 4-4.2 Gel fraction and swelling ratio of fiber mats.....................................75 4-4.3 Thermo-responsive properties of fiber mats......................................77 4-4.4 Flexibility of fiber mats.....................................................................78 4-5 Characterizations of anisotropically conductive fiber mats.........................81 4-5.1 Fiber mats impregnated with PNN and PSBN...................................82 4-5.2 Thermo-responsive properties of fiber mats after impregnation.......85 4-5.3 Flexibility of fiber mats after impregnation.......................................86 Chapter 5 Conclusions...............................................................................................156 Chapter 6 Suggestion of Future Work.......................................................................159 References.............................................................................................................160 Appendix-Preparation of Transparent Dispersive Solution of Nanoparticles............185 A-1 Experimental....................................................................................................186 A-1.1 Materials.................................................................................................186 A-1.2 Sample preparation..................................................................................186 A-1.2.1 Synthesis of titanium dioxide nanoparticles.....................................186 A-1.2.2 Fabrication of TiO2 and TiO2-MTMS thin films..............................186 A-1.3 Characterizations.......................................................................................186 A-1.3.1 FTIR spectroscopy analysis of titanium dioxide powder.................186 A-1.3.2 Thermogravimetric analysis of titanium dioxide solution and powder..........................................................................................................187 A-1.3.3 XRD analysis of titanium dioxide powder...................................... 187 A-1.3.4 TEM analysis of titanium dioxide nanoparticles............................187 A-1.3.5 UV/vis spectroscopy analysis of titanium dioxide solution..............187 A-1.3.6 Refractive index analysis of titanium dioxide solution....................188 A-1.3.7 Concentration effect on dispersion stability of TiO2 and TiO2-MTMS nanoparticles................................................................................................188 A-2 Results and Discussion........................................................................................188 A-2.1 FTIR analyses of TiO2 and TiO2-MTMS nanoparticles.....................188 A-2.2 TGA of TiO2 and TiO2-MTMS solutions and powders...................189 A-2.3 XRD spectra of TiO2 and TiO2-MTMS thin films under different heat treatments...................................................................................................189 A-2.4 TEM observation of size distribution and dispersion of the titanium dioxide nanoparticles .................................................................................190 A-2.5 UV-vis spectroscopy.........................................................................191 A-2.6 Refractive index of TiO2 and TiO2-MTMS solutions.......................191 A-2.7 Dispersion stability test.....................................................................192 A-3 Conclusions........................................................................................................193 | |
dc.language.iso | en | |
dc.title | 具溫感性之異方性導電纖維膜之製備與分析 | zh_TW |
dc.title | Fabrication and Characterization of Anisotropically Conductive and Thermo-responsive Fiber mats | en |
dc.type | Thesis | |
dc.date.schoolyear | 104-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 董崇民(Trong-Ming Don),李佳芬(Chia-Fen Lee),賴森茂(Sun-Mou Lai),韓錦鈴(Jin-Lin Han) | |
dc.subject.keyword | 同軸雙層靜電紡絲技術,順向性纖維膜,溫度敏感特性,導電高分子,可撓性, | zh_TW |
dc.subject.keyword | coaxial electrospinning,aligned fiber mat,thermo-responsive,conducting polymer,flexibility, | en |
dc.relation.page | 208 | |
dc.identifier.doi | 10.6342/NTU201603369 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2016-08-20 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 化學工程學研究所 | zh_TW |
顯示於系所單位: | 化學工程學系 |
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