光散射技術在檢測溶液特性參數(shù)研究中的應用
發(fā)布時間：2018-11-16 11:04
【摘要】：隨著科技的進步,高分子材料在化工產(chǎn)品生產(chǎn)、醫(yī)學藥品研發(fā)、環(huán)境治理等領域被廣泛應用。為了保證高分子材料性能滿足需要,利用微粒檢測技術對高分子材料進行性能監(jiān)測分析。目前,國內(nèi)外發(fā)展了很多微粒檢測的方法和儀器,特別是光散射技術,由于其具有測量精度高和速度快的優(yōu)點而得到廣泛的應用。本文是利用光散射技術檢測高分子溶液的第二維里系數(shù)A_2、重均分子量M_w、均方旋轉(zhuǎn)半徑R_g等參數(shù)。通過研究光散射技術提出本課題解決方案并搭建測試平臺。主要研究內(nèi)容如下:1、介紹光散射技術的發(fā)展現(xiàn)狀和光散射現(xiàn)象的本質(zhì)。對光散射理論基礎和Mie理論進行詳細介紹。隨后引出了Mie理論的近似理論瑞利散射理論,并分析該近似理論的適用條件。2、根據(jù)光散射原理提出解決方案,即確定瑞利散射理論作為整個系統(tǒng)的工作原理。完成實驗測試系統(tǒng)設計,搭建了一套光散射測量高分子溶液特性的實驗平臺。3、分析和驗證系統(tǒng)設計方案。使用PSpice軟件分別對光電轉(zhuǎn)換電路的帶寬、電路噪聲以及直流偏置點進行仿真分析,驗證實驗平臺的可靠性。結果表明:電路特征頻率在超過60Hz時,輸出噪聲速度增速明顯加快。對光電轉(zhuǎn)換電路靜態(tài)標定后得到:重復性誤差為2.81%、遲滯誤差為1.76%。檢驗了系統(tǒng)的采樣率不會超過為11KHz。通過以上工作,保證了設計系統(tǒng)中每個功能模塊都能正常運行。4、最后對系統(tǒng)各個功能模塊進行實驗,順利獲得高分子材料的第二維里系數(shù)A_2、均方旋轉(zhuǎn)半徑R_g、重均分子量M_w等參數(shù)。
[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.
【學位授予單位】：中北大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O436.2;TP274
本文編號：2335338
[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.
【學位授予單位】：中北大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O436.2;TP274
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