NDLI: High Temperature VARTM of Phenylethynyl Terminated Imides (PETI) Resins

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High Temperature VARTM of Phenylethynyl Terminated Imides (PETI) Resins

Content Provider	Semantic Scholar
Author	Ghose, Sayata Cano, Roberto J. Britton, Sean M. Watson, Kent A. Jensen, Brian James Connell, John W.
Copyright Year	2010
Abstract	Fabrication of composite structures using vacuum assisted resin transfer molding (VARTM) is generally more affordable than conventional autoclave techniques. Recent efforts have focused on adapting VARTM for the fabrication of high temperature composites. Due to their low melt viscosity and long melt stability, certain phenylethynyl terminated imides (PETI) can be processed into composites using high temperature VARTM (HT-VARTM). However, one of the disadvantages of the current HT-VARTM resin systems has been the high porosity of the resultant composites. For aerospace applications a void fraction of less than 2% is desired. In the current study, two PETI resins, LARC TM PETI-330 and LARCTM PETI-8 have been used to fabricate test specimens using HT-VARTM. The resins were infused into carbon fiber preforms at 260 °C and cured between 316 °C and 371 °C. Modifications to the thermal cycle used in the laminate fabrication have reduced the void content significantly (typically < 3%) for carbon fiber biaxially woven fabric. Photomicrographs of the panels were taken and void contents were determined by acid digestion. For carbon fiber uniaxial fabric, void contents of less than 2% have been obtained using both PETI-8 and PETI-330. Mechanical properties of the panels were determined at both room and elevated temperatures. These include short beam shear and flexure tests. The results of this work are presented herein. This paper is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Corresponding author: Sayata Ghose, sayata.ghose-1@nasa.gov , 1-757-864-2094
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20100021133.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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