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| 題 名 | The roperties of Creep and Stress Relaxation of Polymer=高分子材料的潛變及應力鬆弛性質 |
|---|---|
| 作 者 | 張林成; | 書刊名 | 中華工專學報 |
| 卷 期 | 8 1993.02[民82.02] |
| 頁 次 | 頁14-26 |
| 分類號 | 440.2 |
| 關鍵詞 | 高分子材料; 潛變; 應力; 鬆弛; |
| 語 文 | 英文(English) |
| 中文摘要 | 高分子材料的機械性質係由其鬆弛或遲滯時間的分佈而決定,而它們 又隨分子結構,分子因素及環境因素而改變。潛變及應力鬆弛的實驗花費相當長 的時間,係由於分子的運動需要長時間。溫度是決定潛變及應力鬆弛的主要因 素。在玻璃的轉變過程中,影響其性質改變速率的最重要因素為時間及溫度。在 溫度低於Tg時,決定潛變及應力鬆弛現象的主要因素為自由體積。當自由體積 增加時,可以利用的空間變大,因此,各種形式的分子運動因而發生。自由體積 可由降低溫度或增加壓力而減少,而這些因素也同樣會減少潛變及應力鬆弛的速 率。 |
| 英文摘要 | The mechanical properties of pol'ymer are determined by the distribution of relaxation of retardation times. These are dependent onnumerous structural and molecular factors as well as enviromentalfactors. Creep and stress relaxation experiments take long periods of time,so that they are sensitive to types of molecular motions which requirelong time. Temperature is a major factor in determining creep andstress relaxation. In the glass transition, the most important thingsabout the rate of change of property are time and temperatures. At temperatures below Tg, the free volume is a major factor indetermining the creep and stress relaxation behavior. As the freevolume increases, the available space becomes larger, so that moretypes of molecular motions can occur. |
本系統中英文摘要資訊取自各篇刊載內容。