柔性多孔導(dǎo)電聚合物復(fù)合材料的制備及其壓阻效應(yīng)研究
發(fā)布時(shí)間：2018-11-25 07:56
【摘要】：柔性多孔導(dǎo)電聚合物復(fù)合材料(PCPC)可具有顯著的壓阻效應(yīng),是“可穿戴”器件的重要材料,在機(jī)器人、健康監(jiān)測等領(lǐng)域都有著巨大的應(yīng)用前景。目前,PCPC的制備方法主要有“浸漬法”及“冰固態(tài)模板法”,所制材料雖然具有低密度及壓縮回彈性良好的特性,但材料的應(yīng)變敏感系數(shù)(GF值)最高僅為3左右。論文提出并研究了一種以高內(nèi)相乳液,“一步法”制備PCPC的新方法:分別以氧化石墨烯(GO)水分散液和柔性單體為高內(nèi)相乳液的分散相和連續(xù)相;在聚合反應(yīng)中,原位還原GO,增強(qiáng)的疏水性驅(qū)使還原氧化石墨烯(rGO)向“油/水”界面遷移;干燥后,rGO附著于材料腔壁表面,從而得到柔性PCPC。本文分別以0.5-5μm及2-10μm兩種片層尺寸的GO為導(dǎo)電填料的前驅(qū)體,系統(tǒng)研究了Vitamin C還原GO的反應(yīng)過程,進(jìn)而考察了GO的尺寸及濃度,乳化劑的濃度及種類對(duì)PCPC微觀形貌、力學(xué)性能、導(dǎo)電性能及壓阻性能的影響。得出如下結(jié)論:1.GO的還原反應(yīng)研究:聚合反應(yīng)中,GO可被Vitamin C同步還原為具有優(yōu)良導(dǎo)電性能的rGO;2.當(dāng)GO的片層尺寸為0.5-5μm時(shí):(1)同步還原得到的rGO覆蓋材料的腔壁表面;rGO致使腔壁增強(qiáng),PCPC形成閉孔結(jié)構(gòu);(2)材料的電導(dǎo)率均隨著壓縮應(yīng)變而增大,具有壓阻性能;(3)隨著GO用量的增高(0.wt%~0.91 wt%,基于最終材料質(zhì)量):材料的平均孔徑略有降低,平均孔徑介于37μm與87μm之間;材料電導(dǎo)率由4.70×10-5 S/m增大至5.93×10-3 S/m;應(yīng)變靈敏度因子GF值呈現(xiàn)先減小后增大的趨勢,但最大值僅為1.03;(4)提高乳化劑Span80用量(8 wt%~23 wt%):材料的平均孔徑減少,比表面積增大,填料面密度降低,因此電導(dǎo)率降低,GF值呈現(xiàn)先減小后增大的趨勢,但最大值僅為1.22;(5)以高表面活性乳化劑Hypermer A70替代Span80后,乳化劑用量對(duì)孔徑的影響與Span80相同,但材料的平均孔徑可降至7μm,因此相比Span80,材料模量更高,電導(dǎo)率降低兩個(gè)量級(jí);電導(dǎo)率隨應(yīng)變呈現(xiàn)無規(guī)改變;稀疏的填料網(wǎng)絡(luò)對(duì)應(yīng)變的響應(yīng)靈敏度很低,GF值僅為0.2;加入增塑劑水楊酸甲酯后,SEM表明材料內(nèi)rGO填料連通性增高,電導(dǎo)率增大,GF值略有增高。3.采用片層尺寸為2-10μm的GO時(shí),材料的性能明顯提升:(1)雖然GO用量對(duì)材料電導(dǎo)率的影響與片層尺寸為0.5-5μm的GO影響相同,但GO用量為0.59 wt%(0.048 vol%)時(shí),材料出現(xiàn)滲流現(xiàn)象,此時(shí)材料的應(yīng)力及應(yīng)變靈敏度最大,5%應(yīng)變時(shí)的靈敏度因子GF值高達(dá)6.0;(2)材料受循環(huán)應(yīng)變時(shí),電阻響應(yīng)穩(wěn)定,具有優(yōu)良的機(jī)電穩(wěn)定性,在可穿戴傳感器件及醫(yī)療領(lǐng)域具有較大的應(yīng)用潛力。
[Abstract]:Flexible porous conductive polymer composite (PCPC) has a significant piezoresistive effect and is an important material for wearable devices. It has great application prospects in robot, health monitoring and other fields. At present, the preparation methods of PCPC are mainly "impregnation method" and "ice solid template method". Although the prepared materials have the characteristics of low density and good compression resilience, the maximum strain sensitivity coefficient (GF) of the materials is only about 3. In this paper, a new method of preparing PCPC with high internal phase emulsion and "one step method" was proposed and studied. The dispersion phase and continuous phase of high inner phase emulsion were composed of graphene oxide (GO) aqueous dispersion and flexible monomer, respectively. In the polymerization reaction, the hydrophobicity enhanced by in-situ reduction of GO, leads to the migration of reduced graphene (rGO) to the "oil / water" interface. After drying, the rGO adheres to the surface of the cavity wall of the material, and a flexible PCPC. is obtained. In this paper, the process of reducing GO by Vitamin C was systematically studied with GO of 0.5-5 渭 m and 2-10 渭 m as the precursor of conductive filler, and the size and concentration of GO, the concentration and type of emulsifier on the micromorphology of PCPC were investigated. Effects of mechanical properties, electrical conductivity and piezoresistive properties. The conclusion is as follows: the reduction reaction of 1.GO: in the polymerization reaction, GO can be simultaneously reduced by Vitamin C to rGO;2. with excellent conductivity. When the lamellar size of GO is 0.5-5 渭 m: (1) the surface of the cavity wall of the rGO coating material obtained by synchronous reduction, the cavity wall is enhanced by rGO, and the structure of PCPC is obturated; (2) the conductivity of the material increases with the compression strain and has the piezoresistive property; (3) with the increase of GO content (0.wt%~0.91 wt%, based on the final material quality): the average pore size of the material decreases slightly, and the average pore size is between 37 渭 m and 87 渭 m; The conductivity of the material increased from 4.70 脳 10 ~ (-5) S / m to 5.93 脳 10 ~ (-3) S / m, and the GF value of strain sensitivity factor decreased first and then increased, but the maximum value was 1.03. (4) increasing the amount of emulsifier Span80 (8 wt%~23 wt%): the average pore size of the material decreased, the specific surface area increased, the density of filler surface decreased, so the conductivity decreased, the GF value decreased first and then increased, but the maximum value was only 1.22; (5) after replacing Span 80 with high surface active emulsifier Hypermer A70, the effect of emulsifier dosage on pore size is the same as that of Span80, but the average pore size of the material can be reduced to 7 渭 m, so the modulus of the material is higher than that of Span80, and the conductivity is two orders of magnitude lower than that of Span80,. The sensitivity of the sparse packing network to the strain is very low, and the GF value is only 0.2. When the plasticizer methyl salicylate was added, SEM showed that the connectivity of rGO filler increased, the electrical conductivity increased, and the GF value increased slightly. The properties of GO with lamellar size of 2-10 渭 m were significantly improved: (1) although the effect of the amount of GO on the conductivity of the material was the same as that of GO with the lamellar size of 0.5-5 渭 m, However, when the amount of GO was 0.59 wt% (0.048 vol%), the material appeared percolation, the sensitivity of stress and strain of the material was the highest, and the sensitivity factor GF value of 5% strain was as high as 6.0; (2) when the material is subjected to cyclic strain, the resistance response is stable and has excellent electromechanical stability. It has great application potential in wearable sensor devices and medical field.
【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB332
本文編號(hào)：2355373
[Abstract]:Flexible porous conductive polymer composite (PCPC) has a significant piezoresistive effect and is an important material for wearable devices. It has great application prospects in robot, health monitoring and other fields. At present, the preparation methods of PCPC are mainly "impregnation method" and "ice solid template method". Although the prepared materials have the characteristics of low density and good compression resilience, the maximum strain sensitivity coefficient (GF) of the materials is only about 3. In this paper, a new method of preparing PCPC with high internal phase emulsion and "one step method" was proposed and studied. The dispersion phase and continuous phase of high inner phase emulsion were composed of graphene oxide (GO) aqueous dispersion and flexible monomer, respectively. In the polymerization reaction, the hydrophobicity enhanced by in-situ reduction of GO, leads to the migration of reduced graphene (rGO) to the "oil / water" interface. After drying, the rGO adheres to the surface of the cavity wall of the material, and a flexible PCPC. is obtained. In this paper, the process of reducing GO by Vitamin C was systematically studied with GO of 0.5-5 渭 m and 2-10 渭 m as the precursor of conductive filler, and the size and concentration of GO, the concentration and type of emulsifier on the micromorphology of PCPC were investigated. Effects of mechanical properties, electrical conductivity and piezoresistive properties. The conclusion is as follows: the reduction reaction of 1.GO: in the polymerization reaction, GO can be simultaneously reduced by Vitamin C to rGO;2. with excellent conductivity. When the lamellar size of GO is 0.5-5 渭 m: (1) the surface of the cavity wall of the rGO coating material obtained by synchronous reduction, the cavity wall is enhanced by rGO, and the structure of PCPC is obturated; (2) the conductivity of the material increases with the compression strain and has the piezoresistive property; (3) with the increase of GO content (0.wt%~0.91 wt%, based on the final material quality): the average pore size of the material decreases slightly, and the average pore size is between 37 渭 m and 87 渭 m; The conductivity of the material increased from 4.70 脳 10 ~ (-5) S / m to 5.93 脳 10 ~ (-3) S / m, and the GF value of strain sensitivity factor decreased first and then increased, but the maximum value was 1.03. (4) increasing the amount of emulsifier Span80 (8 wt%~23 wt%): the average pore size of the material decreased, the specific surface area increased, the density of filler surface decreased, so the conductivity decreased, the GF value decreased first and then increased, but the maximum value was only 1.22; (5) after replacing Span 80 with high surface active emulsifier Hypermer A70, the effect of emulsifier dosage on pore size is the same as that of Span80, but the average pore size of the material can be reduced to 7 渭 m, so the modulus of the material is higher than that of Span80, and the conductivity is two orders of magnitude lower than that of Span80,. The sensitivity of the sparse packing network to the strain is very low, and the GF value is only 0.2. When the plasticizer methyl salicylate was added, SEM showed that the connectivity of rGO filler increased, the electrical conductivity increased, and the GF value increased slightly. The properties of GO with lamellar size of 2-10 渭 m were significantly improved: (1) although the effect of the amount of GO on the conductivity of the material was the same as that of GO with the lamellar size of 0.5-5 渭 m, However, when the amount of GO was 0.59 wt% (0.048 vol%), the material appeared percolation, the sensitivity of stress and strain of the material was the highest, and the sensitivity factor GF value of 5% strain was as high as 6.0; (2) when the material is subjected to cyclic strain, the resistance response is stable and has excellent electromechanical stability. It has great application potential in wearable sensor devices and medical field.
【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB332
【參考文獻(xiàn)】
相關(guān)期刊論文 前2條
1 趙靜;張廣宇;時(shí)東霞;;Review of graphene-based strain sensors[J];Chinese Physics B;2013年05期
2 董研;功能性環(huán)氧樹脂固化劑評(píng)述[J];熱固性樹脂;1997年02期
相關(guān)博士學(xué)位論文 前2條
1 王安妮;乳液模板聚合法制備多孔聚合物整體材料的研究[D];浙江大學(xué);2015年
2 李梓超;高內(nèi)相乳液和雙重乳液模板法制備貫通多級(jí)孔聚合物材料[D];中國科學(xué)技術(shù)大學(xué);2014年
相關(guān)碩士學(xué)位論文 前3條
1 鄭正;以氧化石墨烯為穩(wěn)定劑制備聚合物多孔材料[D];復(fù)旦大學(xué);2014年
2 馬芳芳;導(dǎo)電高分子復(fù)合材料壓阻時(shí)變性與應(yīng)力松弛監(jiān)測初步研究[D];東北大學(xué);2012年
3 喻研;碳納米管/聚合物復(fù)合導(dǎo)電膜的研究[D];華中科技大學(xué);2009年
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