有机硅球的表面修饰及在光扩散材料中的应用研究

发布时间：2018-05-30 11:45

本文选题：聚碳酸酯(PC) + 光扩散剂　；参考：《上海大学》2015年硕士论文

【摘要】：本文针对LED照明的眩光和蓝光危害等应用问题,从LED光扩散材料出发,通过对光扩散剂进行表面修饰和功能化,结合工艺和配方调整,从而获得具有良好光学性能和蓝光屏蔽功能的高分子复合材料。本文的主要研究结果如下:1.采用共沉淀法,使用纳米Ce O2对有机硅球(SMS)进行了表面修饰,研究表明,当硅、铈质量比为1:1时,达到最佳修饰效果,此时,从X射线衍射图谱得出纳米Ce O2在SMS表面为立方萤石结构,平均粒径为10 nm。由红外光谱和X射线光电子能谱分析表明,纳米Ce O2与SMS之间由Ce-O-Si键结合。紫外可见吸收光谱分析表明,复合后的光扩散剂的光吸收介于300nm到480 nm之间。2.将SMS@Ce O2复合光扩散剂加入到聚碳酸酯基体中,光扩散剂添加量在0.6wt%时,材料透光率为63%,雾度为91%。对SMS@Ce O2煅烧研究表明,煅烧温度对PC/SMS@Ce O2透光率和雾度没有影响。但是,在一定温度范围内,随着煅烧温度升高,PC/SMS@Ce O2在蓝光区域内的透光率降低,而在其他可见光区的透光率有所增加。通过对不同材料的蓝光屏蔽性能的对比,发现在蓝光区域中,PC/SMS@Ce O2材料的吸光度比PC/SMS高一倍;而在其他可见光区中,两者的吸光度相差不大,说明SMS@Ce O2复合材料对其他可见光的透光率几乎无影响。上述研究结果表明,Ce O2修饰有机硅球,对PC复合材料透光率和雾度没有影响的情况下,可以屏蔽50%的LED蓝光区的高色温光,减小了LED的蓝光危害。3.采用浸渍法,使用纳米Ti O2对有机硅球进行了表面修饰。研究表明,SMS表面的Si-OH与钛溶胶中的Ti-OH发生反应生成Si-O-Ti键,从而使Ti O2共价键合到SMS表面。由X射线衍射和紫外可见吸收光谱表明,经500 oC煅烧后,所得产物中Ti O2存在锐钛矿和金红石两种晶型,其中金红石相的存在有利于材料对紫外光的吸收,锐钛矿相的存在有利于材料的分散。将SMS@Ti O2复合光扩散剂加入到PC基体中,所得光扩散材料中未出现Ti O2团聚现象,在SMS@Ti O2添加量为0.6 wt%时,透光率为73%,雾度为91%。通过对比相同条件下物理共混的SMS+Ti O2的透光率和雾度,发现SMS@Ti O2添加的材料透光率远高于SMS+Ti O2,而其雾度相当。上述研究表明,将Ti O2修饰到SMS表面,能够在不降低光扩散复合材料雾度的情况下,提高其透光率,从而解决了在极低添加量Ti O2纳米粒子在PC基体中的均匀分散问题。
[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.
【学位授予单位】：上海大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

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