發(fā)布時間：2018-05-03 07:24

  本文選題：納米銀 + 銀/銅納米合金��； 參考：《昆明理工大學(xué)》2017年碩士論文

【摘要】：納米銀聚合物復(fù)合材料具有獨特的物理化學(xué)性質(zhì),包括非線性光學(xué)效應(yīng)、光能轉(zhuǎn)化效應(yīng)等,在抗菌自潔、表面增強拉曼散射光譜(SERS)等方面具有廣闊的應(yīng)用前景。但是由于納米銀聚合物復(fù)合材料的合成過程較為復(fù)雜或成本較高,不利于納米銀聚合物的大規(guī)模生產(chǎn)。大氣低壓等離子體處理具有成本低,處理速率快等優(yōu)點,既不影響聚合物基體的性能,又能增強聚合物基體的表面活性是聚合物表面改性的最佳選擇之一。3-氨丙基三乙氧基硅烷(APTES)作為一種常用的硅烷偶聯(lián)劑,在工業(yè)生產(chǎn)中具有非常廣泛的用途,同時其來源廣泛,價格低廉。APTES具有氨基(-NH2),與納米銀之間具有較強的結(jié)合力,可以用來做納米銀與聚合物至今的聯(lián)接的橋梁。銅/銀納米合金與單一的納米銀或者納米銅相比,具有更加良好的催化、光學(xué)、抗菌性能。聚乙烯醇(PVA)具有優(yōu)秀的水溶性、成膜性、乳化性,耐油脂和耐溶劑性能也很好,且無毒無味,對皮膚無刺激,在纖維、功能高分子材料、涂料、膜材料等領(lǐng)域有廣泛的應(yīng)用。采用大氣低壓等離子體處理聚對苯二甲酸乙二醇酯(PET)表面,并用APTES對PET表面進行修飾,然后在其表面沉積納米銀。X光電子能譜(XPS)、原子力顯微鏡(AFM)以及紫外-可見光(UV-vis)吸收光譜等數(shù)據(jù)表明等離子體處理可以使PET表面的活性基團,進而提高APTES與PET表面的粘結(jié)強度和粘結(jié)數(shù)量,進而提高了 PET表面的氨基密度,最終達到增強納米銀沉積及吸附的效果,提高了材料的耐久性。采用該方法制備AgNPs/Polymer復(fù)合材料的方法足夠簡便,不需要真空等比較苛刻的條件,能夠降低合成成本。利用PVA在100℃下具有還原性的性質(zhì),采用原位還原的方法制備了Ag/PVA、Cu/PVA以及Ag-Cu/PVA復(fù)合薄膜,通過UV-vis吸收光譜掃描電子顯微鏡(SEM)、透射電子顯微鏡(TEM)以及XPS譜對薄膜進行分析,結(jié)果表明,當(dāng)熱處理時間為60min時,PVA中銀離子與銅離子反應(yīng)最完全,銅/銀納米合金均勻的分散在PVA薄膜內(nèi)。納米銀在Ag/PVA中的粒徑為7-9nm,納米銅在Cu/PVA中的粒徑為50 nm,銀/銅納米合金的粒徑為5-20 nm。高分辨透射電子顯微鏡(HRTEM)表明,銀/銅納米合金在PVA中主要以表面為Ag原子包裹的Cu小團簇和Ag小團簇混合在一起的混合結(jié)構(gòu)存在,同時存在少部分的銀銅核殼結(jié)構(gòu)的粒子。
[Abstract]:Nano-silver polymer composites have unique physical and chemical properties, including nonlinear optical effects, light energy conversion effects and so on, which have broad application prospects in antibacterial self-cleaning, surface-enhanced Raman scattering spectroscopy (SERS) and so on. However, the synthesis process of nano-silver polymer composites is more complex or costly, which is not conducive to large-scale production of nano-silver polymers. The treatment of atmospheric low pressure plasma has the advantages of low cost and fast treatment rate, which does not affect the performance of polymer matrix. As a common silane coupling agent, APTES, which can enhance the surface activity of polymer matrix, is one of the best choice for surface modification of polymer. As a common silane coupling agent, it has a wide range of applications in industrial production and has a wide range of sources. Low price. APTES has amino acid-NH _ 2N and strong binding force with nano-silver, which can be used as a bridge between nano-silver and polymer. Copper / silver nanoalloys have better catalytic, optical and antibacterial properties than single nano silver or nano copper. Polyvinyl alcohol PVA (PVA) has excellent water-solubility, film-forming, emulsification, grease resistance and solvent resistance, and is non-toxic and odorless. PVA has been widely used in fiber, functional polymer materials, coatings, membrane materials and other fields. Poly (ethylene terephthalate) (PET) surface was treated by atmospheric low pressure plasma, and PET surface was modified by APTES. Then the deposition of silver nanoparticles on the surface of the PET surface by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and UV-vis-vis absorption spectra shows that plasma treatment can make the active groups on the surface of PET. Furthermore, the bond strength and the amount of bond between APTES and PET surface are increased, and the amino density of PET surface is increased. Finally, the effect of nano-silver deposition and adsorption is enhanced, and the durability of the material is improved. The method of preparing AgNPs/Polymer composites by this method is simple enough and can reduce the cost of synthesis without demanding conditions such as vacuum. Using the reductive property of PVA at 100 鈩，

本文編號：1837553