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Influence of post-cure on carbon fibre polyimide composites with glass transition temperatures above 400ºC
Luleå tekniska universitet, Swerea SICOMP AB, Swerea SICOMP AB, Box 271, 941 26, Piteå.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
2015 (English)Conference paper, Presentation (Refereed)
Abstract [en]

The current communication present results from work on polymeric composites with extreme temperature performance. We are studying carbon fibre composites based on a new phenyl ethynyl terminated polyimide formulation NEXIMID® MHT-R (Nexam Chemicals AB, Sweden) based on hexafluoroisopropylidene bisphthalic dianhydride (6-FDA), 4-(Phenylethynyl)Phthalic Anhydride (4-PEPA) and ethynyl bis-phthalic anhydride (EBPA). This study in particular investigates how post-cure conditions such as time, temperature and atmosphere influence Tg of the composites. In addition to this we also trace and analyse the consequences of post-cure on weight loss and occurrence of micro-cracks. We are considering three different post-curing temperatures: 400°C, 420°C and 440°C in the study. Two different atmospheres, air and inert by nitrogen, were also investigated. In summary the results reveal that remarkably high Tg, up to around 460°C, is achieved with only very limited weight loss. It was also observed that some, but limited amounts of, micro-cracks are developed within the laminates due to the inevitable high thermal stresses generated upon cooling from cure temperature.

Place, publisher, year, edition, pages
Keyword [en]
curing, glass transition temperature, cure induced cracking, Polyimide, Materials science - Construction materials
Keyword [sv]
Teknisk materialvetenskap - Konstruktionsmaterial
Research subject
Polymeric Composite Materials
URN: urn:nbn:se:ltu:diva-37908Local ID: c194b6d5-aa27-4566-b750-7a740183db3eOAI: diva2:1011406
International Conference on Composite Materials : 19/07/2015 - 24/07/2015
Godkänd; 2015; 20150818 (joffe)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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