Novel processable aromatic thermoplastic polyimides: Films, adhesives, moldings, and graphite composites
作者:
Devendra Kumar,
Alka D. Gupta,
期刊:
Polymers for Advanced Technologies
(WILEY Available online 1992)
卷期:
Volume 3,
issue 1
页码: 1-7
ISSN:1042-7147
年代: 1992
DOI:10.1002/pat.1992.220030101
出版商: John Wiley&Sons, Ltd.
关键词: Thermally stable;Polyimides, Processing;Films;Composites;Adhesives;Moldings
数据来源: WILEY
摘要:
AbstractNovel hot‐melt type flexible, tough, thermally stable, processable, thermoplastic, aromatic polyimides have been synthesized involving reaction of a keto‐ether containing diamine with hinged aromatic dianhydrides followed by thermal and chemical cyclodehydration. Inherent viscosity in DMAC at 35°C of the synthesized polymers ranged 1.02 to 1.4 dl/g (0.5% solution). The polymers showed a glass transition temperature (Tg) of 250°C to 180°C as determined by differential scanning calorimetry (DSC) and thermomechanical analysis (TMA). Thermogravimetric analysis showed polymer stability up to 510°C, in both air and nitrogen atmospheres. All the polymers have shown good melt‐flow. Films of 1.5–2.8 ml thickness were made and tested for mechanical properties at room temperature, 177°C and 210°C. The developed films are suitable for adhesion of Ti/Ti specimens and showed a lap shear strength of 5575 psi. Melt‐fusion of the polymers gave tough moldings. Graphite cloth composites have been made and tested for mechan
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