本文選題：聚碳酸酯(PC) + 光擴散劑　； 參考：《上海大學(xué)》2015年碩士論文

【摘要】：本文針對LED照明的眩光和藍光危害等應(yīng)用問題,從LED光擴散材料出發(fā),通過對光擴散劑進行表面修飾和功能化,結(jié)合工藝和配方調(diào)整,從而獲得具有良好光學(xué)性能和藍光屏蔽功能的高分子復(fù)合材料。本文的主要研究結(jié)果如下:1.采用共沉淀法,使用納米Ce O2對有機硅球(SMS)進行了表面修飾,研究表明,當硅、鈰質(zhì)量比為1:1時,達到最佳修飾效果,此時,從X射線衍射圖譜得出納米Ce O2在SMS表面為立方螢石結(jié)構(gòu),平均粒徑為10 nm。由紅外光譜和X射線光電子能譜分析表明,納米Ce O2與SMS之間由Ce-O-Si鍵結(jié)合。紫外可見吸收光譜分析表明,復(fù)合后的光擴散劑的光吸收介于300nm到480 nm之間。2.將SMS@Ce O2復(fù)合光擴散劑加入到聚碳酸酯基體中,光擴散劑添加量在0.6wt%時,材料透光率為63%,霧度為91%。對SMS@Ce O2煅燒研究表明,煅燒溫度對PC/SMS@Ce O2透光率和霧度沒有影響。但是,在一定溫度范圍內(nèi),隨著煅燒溫度升高,PC/SMS@Ce O2在藍光區(qū)域內(nèi)的透光率降低,而在其他可見光區(qū)的透光率有所增加。通過對不同材料的藍光屏蔽性能的對比,發(fā)現(xiàn)在藍光區(qū)域中,PC/SMS@Ce O2材料的吸光度比PC/SMS高一倍;而在其他可見光區(qū)中,兩者的吸光度相差不大,說明SMS@Ce O2復(fù)合材料對其他可見光的透光率幾乎無影響。上述研究結(jié)果表明,Ce O2修飾有機硅球,對PC復(fù)合材料透光率和霧度沒有影響的情況下,可以屏蔽50%的LED藍光區(qū)的高色溫光,減小了LED的藍光危害。3.采用浸漬法,使用納米Ti O2對有機硅球進行了表面修飾。研究表明,SMS表面的Si-OH與鈦溶膠中的Ti-OH發(fā)生反應(yīng)生成Si-O-Ti鍵,從而使Ti O2共價鍵合到SMS表面。由X射線衍射和紫外可見吸收光譜表明,經(jīng)500 oC煅燒后,所得產(chǎn)物中Ti O2存在銳鈦礦和金紅石兩種晶型,其中金紅石相的存在有利于材料對紫外光的吸收,銳鈦礦相的存在有利于材料的分散。將SMS@Ti O2復(fù)合光擴散劑加入到PC基體中,所得光擴散材料中未出現(xiàn)Ti O2團聚現(xiàn)象,在SMS@Ti O2添加量為0.6 wt%時,透光率為73%,霧度為91%。通過對比相同條件下物理共混的SMS+Ti O2的透光率和霧度,發(fā)現(xiàn)SMS@Ti O2添加的材料透光率遠高于SMS+Ti O2,而其霧度相當。上述研究表明,將Ti O2修飾到SMS表面,能夠在不降低光擴散復(fù)合材料霧度的情況下,提高其透光率,從而解決了在極低添加量Ti O2納米粒子在PC基體中的均勻分散問題。
[Abstract]:In this paper, aiming at the problems of glare and blue light hazard in LED illumination, the surface modification and functionalization of the photodiffuser are carried out from the LED photodiffusion material, and the process and formula adjustment are combined. Thus, polymer composites with good optical properties and blue light shielding were obtained. The main results of this paper are as follows: 1. The surface modification of organosilicon spheroids (SMSs) was carried out by using nano-ce O 2 by coprecipitation method. The results showed that the optimum modification effect was obtained when the mass ratio of silicon and cerium was 1:1. From the X-ray diffraction patterns, it is found that nano-ce O _ 2 has cubic fluorite structure on the surface of SMS, and the average particle size is 10 nm. The infrared spectra and X-ray photoelectron spectroscopy (XPS) analysis show that Ce-O-Si bond binds between nano-ce O _ 2 and SMS. UV-Vis absorption spectra showed that the light absorption of the composite photodiffuser ranged from 300nm to 480nm. The SMS@Ce O 2 composite photodiffuser was added to the polycarbonate matrix. When the content of the photodiffuser was 0.6 wt%, the transmittance of the material was 63 and the fog was 91. The results of SMS@Ce O2 calcination show that the calcination temperature has no effect on the transmittance and haze of PC/SMS@Ce O2. However, with the increase of calcination temperature, the transmittance of PC-SMSCEO _ 2 decreases in blue region and increases in other visible regions. By comparing the blue shielding properties of different materials, it is found that the absorbance of PC-SMS-CEO _ 2 in blue region is twice that of PC/SMS, but in other visible regions, the absorbance of PC-SMS-CEO _ 2 is not different. The results show that the SMS@Ce O 2 composite has little effect on the transmittance of other visible light. The above results show that the modified organosilicon spheres modified with ce O 2 have no effect on the transmittance and haze of PC composites, and can shield 50% of the high color temperature light in the blue region of LED and reduce the harm of blue light of LED. 3. The surface of organosilicon spheres was modified with nano TIO 2 by impregnation method. It is shown that the Si-O-Ti bond is formed by the reaction between the Si-OH and Ti-OH in titanium sol, which results in the covalent bonding of TIO 2 to the surface of SMS. X-ray diffraction and UV-Vis absorption spectra show that there are anatase and rutile crystals in TIO _ 2 after calcined at 500oC, and the presence of rutile phase is beneficial to the absorption of ultraviolet light. The existence of anatase phase is beneficial to the dispersion of materials. When the SMS@Ti O 2 composite photodiffuser was added to the PC matrix, there was no TIO 2 agglomeration in the photodiffusion material. When the content of SMS@Ti O 2 was 0.6 wt%, the transmittance was 73 and the fog was 91%. By comparing the transmittance and haze of SMS TIO 2 blends under the same conditions, it is found that the transmittance of SMS O 2 added by SMS@Ti O 2 is much higher than that of SMS TIO 2, but the fog degree is the same. The above results show that the TIO _ 2 modification on the surface of SMS can improve the light transmittance without decreasing the fog of the photodiffusion composite, thus solving the problem of uniform dispersion of TIO _ 2 nanoparticles in PC matrix with very low amount of TIO _ 2 added.
【學(xué)位授予單位】：上海大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB33

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本文編號：1955187