本文選題：等離子體射流 + 聚合　； 參考：《東華大學(xué)》2015年碩士論文

【摘要】：大氣壓等離子體放電多是在間隙較小的平行板電極間進(jìn)行，限制了處理材料的幾何形狀尺寸，放電的穩(wěn)定性也容易受到影響。大氣壓等離子體射流（Atmospheric Pressure Plasma Jet）放電區(qū)域與工作區(qū)域相分離，互不影響，可以處理形狀較為復(fù)雜的材料，材料的表面處理均勻性好，同時放電氣體的溫度較低，因此在材料表面改性、薄膜沉積、生物醫(yī)學(xué)等方面得到大規(guī)模的應(yīng)用。 本文設(shè)計了單電極大氣壓沿面介質(zhì)阻擋放電Ar等離子體射流裝置，系統(tǒng)的研究了不同的實驗條件（外加電壓，氣體流速，放電間隙等）對放電特性的影響。通過發(fā)射光譜，分析了等離子體射流中存在的主要基團(tuán)。選用了波長分別為696.12nm、706.34nm、714.93nm的譜線，通過波爾茲曼作圖法，線性擬合求得電子激發(fā)溫度。此外，，通過光纖傳感器測量了管外氣體的溫度。 聚（N-異丙基丙烯酰胺）（PNIPAm）分子內(nèi)同時含有親水的酰胺基和疏水的異丙基，因此具有良好的溫敏特性。PNIPAm在水溶液中有較低的臨界溶解溫度（Lower Critical Solution Temperature，LCST）：當(dāng)溶液溫度低于LCST時，聚合物具有良好的溶解性，溶液呈透明狀；當(dāng)溫度升高到LCST以上時，聚合物會從水溶液中相分離，溶液變渾濁。且整個相變過程具有可逆性。這種獨特的溫敏性相轉(zhuǎn)變功能，使其在藥物緩釋、物質(zhì)分離、環(huán)境監(jiān)測、溫敏開關(guān)等方面具有廣泛的應(yīng)用前景。 本文首次對不同濃度的NIPAm單體水溶液的溫敏性進(jìn)行了研究，結(jié)果表明高濃度的NIPAm溶液也具有一定的溫敏性。 本文以不同濃度的N-異丙基丙烯酰胺（NIPAm）單體為反應(yīng)物，在常壓下，通過氣體（Ar）攜帶單體溶液的方法，首次采用等離子體射流在基底表面聚合一系列不同單體濃度的PNIPAm聚合物，使用掃描電子顯微鏡(SEM)、紅外光譜、水接觸角表征了產(chǎn)物的結(jié)構(gòu)與性能。聚合物的傅里葉紅外光譜(FT-IR)顯示存在C=O伸縮振動峰和N-H彎曲振動峰；SEM和接觸角溫敏變化等的分析結(jié)果，表明大氣壓等離子體射流成功聚合得到了PNIPAm。
[Abstract]:The atmospheric pressure plasma discharge is mostly carried out between parallel plate electrodes with small gap, which limits the geometry and size of the treated materials, and the stability of the discharge is easily affected. Atmospheric plasma jet can separate the discharge area of Atmospheric Pressure Plasma Jet) from the working area. It can be used to deal with materials with more complicated shape. The surface treatment uniformity of the materials is good, and the temperature of the discharge gas is low. Therefore, it is widely used in material surface modification, film deposition, biomedicine and so on. An ar plasma jet device for dielectric barrier discharge (DBD) with a single electrode at atmospheric pressure is designed in this paper. The effects of different experimental conditions (applied voltage, gas velocity, discharge gap, etc.) on the discharge characteristics are systematically studied. The main groups in plasma jet were analyzed by emission spectrum. The electron excitation temperature was obtained by linear fitting with a wavelength of 696.12 nm ~ 706.34 nm ~ 714.93 nm. In addition, the temperature of gas outside the tube was measured by optical fiber sensor. Poly (N- isopropyl acrylamide) contains hydrophilic amide group and hydrophobic isopropyl group, so it has good temperature sensitivity. PNIPAm has lower critical solution temperature and lower Critical Solution temperature when the solution temperature is lower than LCST. When the temperature is higher than LCST, the polymer will be separated from the aqueous solution and the solution will become turbid. The whole phase transition process is reversible. This unique function of phase transition of temperature sensitivity makes it have a wide application prospect in drug release, substance separation, environmental monitoring, temperature sensitive switch and so on. The temperature sensitivity of NIPAm monomer aqueous solution with different concentrations was studied for the first time in this paper. The results show that the high concentration of NIPAm solution also has a certain temperature sensitivity. In this paper, a series of PNIPAm polymers with different monomer concentrations were firstly polymerized by plasma jet on the substrate surface using different concentrations of N-isopropyl acrylamide as reactants. The structure and properties of the products were characterized by SEM, IR and water contact angle. Fourier transform infrared spectroscopy (FT-IR) of the polymer shows the existence of Cno stretching vibration peak and N-H bending vibration peak SEM and temperature sensitive change of contact angle. It is shown that PNIPAms have been successfully polymerized by atmospheric pressure plasma jet.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB324

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