添加多壁奈米碳管/銀對聚氨酯複合薄膜用於靜電防護之研究

A Study on Electrostatic Discharge Protection of Additional MWCNT /Ag on Polyurethane Composite Films

蘇家怡(Chia-Yi Su)

指導教授 ： 段葉芳

國立臺北科技大學/工程學院/化學工程研究所/碩士(2010年)

摘要

本實驗第一部份以預聚物法將聚酯多元醇M6220、聚丙二醇、二羥甲基丙酸和二異氰酸異佛爾酮反應形成PU預聚物，再加入三乙胺中和形成陰離子型水性聚氨酯，接著再以鏈延長劑1,4-丁二醇進行鏈延長，最後加入去離子水形成陰離子型水性聚氨酯，反應過程中以傅立葉轉換紅外線光譜儀來觀測NCO官能基的變化來判定反應完成。第二部份實驗選用直徑10-20nm，長度0.1-10μm，純度95%的多壁奈米碳管以濃硫酸和硝酸處理，再將硝酸銀、聚乙烯砒碇高分子、硫酸月桂酸鈉和氫氧化鈉溶液加入乙二醇溶液中以超音波震盪反應出奈米銀粒子附著於其上。最後將水性聚氨酯混摻1%、5%、10%、15%比例的多壁奈米碳管/銀和奈米級碳黑EC-600JD，製備成導電性複合薄膜，並探討不同添加量對導電性及熱穩定性的影響，及抗菌效果。多壁奈米碳管/銀複合材的微結構和表面形貌以射掃描式電子顯微鏡、穿透式電子顯微鏡、X 光繞射儀和傅立葉轉換紅外線光譜儀來查證。聚氨酯複合膜的導電度和熱穩定性以電阻計和熱重分析儀來量測。奈米碳管/銀添加量10%時相較於PU熱裂解溫度5%時提升17oC，當添加碳黑1%和奈米碳管/銀5%後導電度由6.12×10-5提升為3×10-4，在抗菌率方面，只要添加1%奈米碳管銀就能達到抗菌效果。

關鍵字

水性聚氨基甲酸酯 ； 靜電放電 ； 多壁奈米碳管 ； 銀奈米粒子

並列摘要

Stage one of this study, pre-polymer of polyurethane was synthesized with a prepolymer mixing process, by adding polyol M6220, poly propylene glycol and isophorone iisocyanate. In addition this product is neutralized by triethyl amine, and then reacted with 1,4-butanediol as chain extension agent. Finally anionic aqueous polyurethane was synthesized by adding deionized water to the above product. During the reaction process, we used fourier transform infrared spectrophotometer in order to measure the changes of NCO group to determine the reaction was completed. Stage two, we used MWCNT with 10-20 nm in diameter, 0.1-10μm in length, and 95% of purity. These were treated by a concentrated H2SO4 and HNO3, and then ultrasonicat ed with AgNO3, PVP, SDS and NaOH in ethylene glycol solution for nanosized Ag particles deposition on it. Finally we prepared conductive composite film by mixing1%, 5%, 10%, 15% of MWCNT/Ag and carbon black EC-600JD with aqueous polyurethane, and investigated the effects of different content percentage on electrical conductivity, thermal stability and antibacterial effects. The microstructure and surface morphology of Ag/MMWNT composite was investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and fourier transform infrared spectrophotometer. The electrical conductivity and thermal stability of polyurethane composite films was measured by resistance meter and thermogravimetric analysis. Degradation temperatures is enhancing 17 oC than aqueous polyurethane by adding 10% of MWCNT/Ag, and conductivity is increased from 6.12×10-5 to 3×10-4 by adding 5% of CB and MWCNT/Ag. For antibacterial, we can reach antibacterial effects by adding 1% of MWCNT/Ag.

並列關鍵字

Aqueous Polyurethane ； Electrostatic Discharge (ESD) ； Multi-walled Carbon Nanotube (MWCNT) ； Ag nanoparticles

參考文獻

[1] K. N. Ajaya and D. A. Wicks, "The influence of the ionic concentration, concentration of the polymer, degree of neutralization and chain extension on aqueous polyurethanedispersions prepared by the acetone process," Polymer , vol. 47, issue6, 2006, pp. 1805-1811.

[2] J. Paasi, S. Nurmi, and R. Vuorinen et. al., “Performance of ESD Protective Materials at Low Relative Humidity,” J. Electrostatics, vol. 51-52, 2001, pp. 429~434.

[3] S. A. Halperin, " Guidelines for Static Control Management, " Eurostat., 1990.

[10] R. B.Rosner, " Conductive Materials for ESD Applications：An Overview," IEEE Transactions on Device Materials Reliability, vol. 1, no. 1, 2001, pp.9-16.

[16] I. Novak , I. Krupa, I. Chodak, "Investigation of the correlation between electrical conductivity and elongation at break in polyurethane –base adhesives, " Synthetic Metals, vol, 131, 2002, pp. 93-98.