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研究生:蔡政訓
論文名稱:經γ-ray照射之HEMA在緩衝液中的質傳研究
論文名稱(外文):Evolution of buffer transport in poly (2-Hydroxyethy1 methacrylate) irradiated by r-ray
指導教授:李三保李三保引用關係
學位類別:碩士
校院名稱:國立清華大學
系所名稱:材料科學工程學系
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:82
中文關鍵詞:質傳
外文關鍵詞:hema
相關次數:
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本文研究hema經過gamma-ray照射後, 在緩衝液中的吸收行為. 緩衝液由磷酸二鈉和檸檬酸所合成, 緩衝液的pH值分別為3.2, 4.1, 5.6, 6.5, 與7.2. 實驗的曲線用Hrmon's model 去做做理論與實驗的比對.

The mass transport behavior of buffer in hydroxyethyl methacrylate copolymer (HEMA) at the temperature of 35℃-55℃ was investigated. The HEMA was irradiated with gamma-ray at radiation doses of 86-344 kGy in air. The buffer was prepared by citric acid anhydrous and sodium phosphate dibasic anhydrous. The pH values of buffer are 3.2~7.2.
The transport behavior was studied by Harmon’s model. When the pH value of buffer is lower than 5.6, the experimental data are in excellent agreement with the Harmon’s model. If the pH value of buffer is larger than 5.6, the experimental data was divided into two stages. The first stage is pure Case I and the second stage is anomalous diffusion. The activation energies for diffusion (ED) and relaxation processes (Ev) were calculated from the Arrhenius plots of D and v.
When the specimen, absorbed in buffer, is saturation, the solubility (S) of solvent in the specimen was determined. If the pH value of buffer increased, the solubility increased, too. For pH 3.2 and 4.1, the solubility decreased with increasing gamma-ray dosage. However, the sequence is opposite for pH 6.5 and 7.2.
Compared the transition time when stage I switch to stage II and the time when the sharp front meet, we can find that the mechanisms changed due to the sharp front.
The FTIR spectrum of HEMA showed a new peak at 1565cm-1 after the mass transport if the buffer of pH≧5.6. The peak was induced by C6H7O7- in HEMA.

Acknowledgment I
Abstract II
Introduction 1
Experiment 6
Results and Discussion 9
Conclusions 21
References 23
List of Tables 28
Figure Captions 49

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