NDLI: Polyimides based on asymmetric dianhydrides (ii) (a-bpda vs a-btda) for resin transfer molding (rtm)

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Polyimides based on asymmetric dianhydrides (ii) (a-bpda vs a-btda) for resin transfer molding (rtm)

Content Provider	NASA Technical Reports Server (NTRS)
Author	Mintz, Eric A. Chuang, Kathy C. Criss, Jim M.
Copyright Year	2010
Description	A new series of low-melt viscosity imide resins (10-20 poise at 280 C) were formulated from asymmetric 2,3,3',4' -benzophenone dianhydride (a-BTDA) and 4-phenylethynylphthalic endcaps, along with 3,4' -oxydianiline, 3,3' -methylenedianiline and 3,3'- diaminobenzophenone, using a solvent-free melt process. a-BTDA RTM resins exhibited higher glass transition temperatures (Tg's = 330-400 C) compared to those prepared by asymmetric 2,3,3',4' -biphenyl dianhydride, (a-BPDA, Tg's = 320-370 C). These low-melt viscosity imide resins were fabricated into polyimide/T650-35 carbon fiber composites by a RTM process. Composites properties of a-BTDA resins, such as open-hole compression and short-beam shear strength, are compared to those of composites made from a-BPDA based resin at room temperature, 288 C and 315 C. These novel, high temperature RTM imide resins exhibit outstanding properties beyond the performance of conventional RTM resins, such as epoxy and BMI resins which have use-temperatures around 177 C and 232 C for aerospace applications.
File Size	3686991
Page Count	12
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20100040591
Archival Resource Key	ark:/13960/t9867h51d
Language	English
Publisher Date	2010-05-17
Access Restriction	Open
Subject Keyword	Composite Materials Viscosity Anhydrides Panels Resin Transfer Molding Rheology Shear Strength Mechanical Properties Synthesis Chemistry Physical Properties Glass Transition Temperature Aerospace Engineering Oligomers Fabrication Diamines Carbon Fibers Asymmetry Polyimides Room Temperature Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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