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題名 | Physical and Chemical Aging of Carbon-Fiber Reinforced Polymide Composites=碳纖維強化高分子複合材料物理和化學時效效應 |
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作者 | 龔皇光; Kung, Huang-kuang; |
期刊 | 正修學報 |
出版日期 | 19970700 |
卷期 | 10 1997.07[民86.07] |
頁次 | 頁89-102 |
分類號 | 440.23 |
語文 | eng |
關鍵詞 | 複合材料; 化學時效效應; 物理時效效應; 穩定性; 軟化溫度; Composites; Chemical aging; Physical aging; Dimensional stability; Glass-transition temperature; |
中文摘要 | 當高分子複合材料用於高溫的工作環境,其物理及化學時效效應最為令人關切。 因時效效應和材料尺寸穩定性,材料熱機械性質及材料長期可靠性都有密切關連。文獻上, 大部分的研究都集中在物理時效效應對高分子複合材料的影響。甚少探討化學時效效應,物 理時效效應和材料尺寸變化的相互作用關係。本研究,將從高溫時效效應實驗上來決定材料 因時效效應所產生材料的軟化溫度改變及相關的尺寸變化。實驗結果顯示,本實驗所採用高 分子材料的軟化溫度會隨時效效應而遞增。且初期化學時效效應對材料尺寸的影響遠較物理 時效效應為顯著。 |
英文摘要 | Concerns on physical and chemical aging have been noted in carbon-fiber reinforced polyimide composites when exposed to elevated temperatures. Aging and the associated dimensional stability can play significant roles in the matrix-dominant, thermomechanical properties and long-term reliability of the composites. In the experimental part of this study, high-temperature aging experiments are conducted to determine the glass-transition temperature change and the associated aging-induced strains in a carbon-fiber reinforced polyimide composite. Relationships among chemical and physical aging parameters, and the glass-transition temperature change are obtained. A theory, based on the thermally activated rate process, has been developed to describe the irreversible chemical aging kinetics in the composite. For the G30-500/PMR 15 composite, high-temperature aging causes a continuous increase in Tg due to additional crosslinking reactions in the matrix. The individual contributions of, and interactions between, physical and chemical aging to the aging-induced deformations have been evaluated and compared with at different stages of aging time and temperature exposure. Current results indicate that the magnitude of chemical aging-induced dimensional change is much more significant than that from physical aging. |
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