| 聚醚酰亚胺热焓松弛的分子量依赖关系 |
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| 引用本文： | 余英丰,陈睿,李善君.聚醚酰亚胺热焓松弛的分子量依赖关系[J].高分子材料科学与工程,1998(6). |
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| 作者姓名： | 余英丰 陈睿 李善君 |
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| 作者单位： | 复旦大学高分子科学系 |
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| 基金项目： | 国家自然科学基金,四川联合大学高分子材料工程国家开放实验室资助课题 |
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| 摘 要： | 采用ＤＳＣ对不同分子量的聚醚酰亚胺的等温及动态热焓松弛行为进行了研究，并以ＫＷＷ方程对实验数据进行了非线性拟合。结果表明，分子量对热焓松弛的影响是由高分子端基引起自由体积的差异所致。不同分子量的聚醚酰亚胺分子具有不同数量的端基，淬冷时端基数目的差异将产生不同数量的过剩自由体积，从而影响松弛热焓及松弛速率、低分子量的聚醚酰亚胺松弛相对较快，且起始热焓高，松弛的表观活化能亦较小。
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| 关 键 词： | 聚醚酰亚胺，热焓松弛，KWW方程，等温老化，动态老化 |
THE EFFECT OF MOLECULAR WEIGHT ON THE ENTHALPY RELAXATION OF POLYETHERIMIDE |
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| Yu Yingfeng,Chen Rui,Li Shanjun.THE EFFECT OF MOLECULAR WEIGHT ON THE ENTHALPY RELAXATION OF POLYETHERIMIDE[J].Polymer Materials Science & Engineering,1998(6). |
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| Authors: | Yu Yingfeng Chen Rui Li Shanjun |
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| Abstract: | The isothermal and dynamic enthalpy relaxation behaviors of polyetherimide were studied by using DSC, and the data obtained were non linear fitted with the KWW function. It has revealed that molecuar weight exerts little influence on the enthalpy relaxation of polyetherimide. The influence of molecular weight on the enthalpy relaxation is due to discrepancy of excess free volume caused by the amount of end group of different molecular weight polyetherimide when it is subjected to quench. Low molecular weight polyetherimide relaxes relatively quickly with higher initial enthalpy relaxation and lower apparently active energy of relaxation. |
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| Keywords: | polyetherimide enthalpy relaxation KWW function isothermal aging dynamic aging |
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