光散射技术在检测溶液特性参数研究中的应用

发布时间：2018-11-16 11:04

【摘要】：随着科技的进步,高分子材料在化工产品生产、医学药品研发、环境治理等领域被广泛应用。为了保证高分子材料性能满足需要,利用微粒检测技术对高分子材料进行性能监测分析。目前,国内外发展了很多微粒检测的方法和仪器,特别是光散射技术,由于其具有测量精度高和速度快的优点而得到广泛的应用。本文是利用光散射技术检测高分子溶液的第二维里系数A_2、重均分子量M_w、均方旋转半径R_g等参数。通过研究光散射技术提出本课题解决方案并搭建测试平台。主要研究内容如下:1、介绍光散射技术的发展现状和光散射现象的本质。对光散射理论基础和Mie理论进行详细介绍。随后引出了Mie理论的近似理论瑞利散射理论,并分析该近似理论的适用条件。2、根据光散射原理提出解决方案,即确定瑞利散射理论作为整个系统的工作原理。完成实验测试系统设计,搭建了一套光散射测量高分子溶液特性的实验平台。3、分析和验证系统设计方案。使用PSpice软件分别对光电转换电路的带宽、电路噪声以及直流偏置点进行仿真分析,验证实验平台的可靠性。结果表明:电路特征频率在超过60Hz时,输出噪声速度增速明显加快。对光电转换电路静态标定后得到:重复性误差为2.81%、迟滞误差为1.76%。检验了系统的采样率不会超过为11KHz。通过以上工作,保证了设计系统中每个功能模块都能正常运行。4、最后对系统各个功能模块进行实验,顺利获得高分子材料的第二维里系数A_2、均方旋转半径R_g、重均分子量M_w等参数。
[Abstract]:With the progress of science and technology, polymer materials are widely used in the fields of chemical production, medical drug research and development, environmental management and so on. In order to ensure that the properties of polymer materials meet the needs, the performance of polymer materials is monitored and analyzed by particle detection technology. At present, many methods and instruments of particle detection have been developed at home and abroad, especially light scattering technology, which has been widely used because of its advantages of high measurement accuracy and high speed. In this paper, we use the light scattering technique to detect the parameters such as the second dimension coefficient A _ s _ 2, the weight average molecular weight M _ s _ w, the mean square rotation radius R _ s _ g of the polymer solution. Through the research of light scattering technology, this paper puts forward the solution of this subject and builds the test platform. The main research contents are as follows: 1. The development of light scattering technology and the essence of light scattering phenomenon are introduced. The theoretical basis of light scattering and Mie theory are introduced in detail. Then, the approximate theory of Rayleigh scattering of Mie theory is introduced, and the applicable conditions of the approximate theory are analyzed. 2. According to the principle of light scattering, the solution is put forward, that is, the Rayleigh scattering theory is determined as the working principle of the whole system. A set of experimental platform for measuring the properties of polymer solution by light scattering was set up. 3. The design scheme of the system was analyzed and verified. The PSpice software is used to simulate and analyze the bandwidth, noise and DC bias of the photoelectric conversion circuit to verify the reliability of the experimental platform. The results show that when the characteristic frequency of the circuit exceeds 60Hz, the speed of output noise increases obviously. After static calibration of the photoelectric conversion circuit, the repeatability error is 2.81 and the hysteresis error is 1.76. The sampling rate of the system is not more than 11kHz. Through the above work, every functional module in the design system is guaranteed to run normally. Finally, experiments are carried out on each functional module of the system, and the second dimension of the polymer material, A _ 2, and the mean square rotation radius, Rg, are successfully obtained. The weight average molecular weight (MW) M _ W is the same as the other parameters.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O436.2;TP274

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