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篇目详细内容 |
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【篇名】 |
Synthesis and characterization of organosoluble aromatic copolyimids |
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【刊名】 |
Frontiers of Chemistry in China |
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【刊名缩写】 |
Front. Chem. China |
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【ISSN】 |
1673-3495 |
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【EISSN】 |
1673-3614 |
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【DOI】 |
10.1007/s11458-007-0022-8 |
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【出版社】 |
Higher Education Press and Springer-Verlag |
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【出版年】 |
2007 |
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【卷期】 |
2
卷2期 |
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【页码】 |
107-112
页,共
6
页 |
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【作者】 |
YANG Jintian;
HUANG Wei;
ZHOU Yongfeng;
YAN Deyue;
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【关键词】 |
polyimide; copolycondensation; PMDA; MBTBA; PDA |
【摘要】 |
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A series of aromatic copolyimides was successfully synthesized from the commercial pyromellitic dianhydride (PMDA) with a commercial diamine p-phenyldiamine (PDA) and a diamine 4,4′-methylenebis-(2-tert-butylaniline) (MBTBA) specially designed by the authors. The copolyimides were characterized by Infra-red (IR), Nuclear Magnetic Resonance (NMR), Gel Permeation Chromatography (GPC), Ultraviolet Visual (UV-Vis), Thermogravimetic Analysis (TGA) and Dynamic Mechanical Analysis (DMA). The copolyimide was precipitated in m-cresol in the polymerization process when the molar ratio of MBTBA and PDA was lower than 6/4. The number-average molecular weight of the soluble copolyimides measured by GPC was larger than 4.0×104, and the polydispersity index was higher than 1.5. Only one glass transition temperature of these copolyimdies was detected around 360°C by DMA. The copolyimides did not show appreciable decomposition up to 500°C under N2, and the thermal stability of the copolyimide increased a little with the introduction of PDA into the polyimide main chain. |
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