NDLI: Polyimides with pendant alkyl groups

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Polyimides with pendant alkyl groups

Content Provider	NASA Technical Reports Server (NTRS)
Author	Young, P. R. Jensen, B. J.
Copyright Year	1982
Description	The effect on selected polyimide properties when pendant alkyl groups were attached to the polymer backbone was investigated. A series of polymers were prepared using benzophenone tetracarboxylic acid dianhydride (BTDA) and seven different p-alkyl-m,p'-diaminobenzophenone monomers. The alkyl groups varied in length from C(1) (methyl) to C(9) (nonyl). The polyimide prepared from BTDA and m,p'-diaminobenzophenone was included as a control. All polymers were characterized by various chromatographic, spectroscopic, thermal, and mechanical techniques. Increasing the length of the pendant alkyl group resulted in a systematic decrease in glass transition temperature (Tg) for vacuum cured films. A 70 C decrease in Tg to 193 C was observed for the nonyl polymer compared to the Tg for the control. A corresponding systematic increase in Tg indicative of crosslinking, was observed for air cured films. Thermogravimetric analysis revealed a slight sacrifice in thermal stability with increasing alkyl length. No improvement in film toughness was observed.
File Size	536677
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19830006003
Archival Resource Key	ark:/13960/t6wx26x3m
Language	English
Publisher Date	1982-11-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Alkyl Compounds Polyimides Purity Curing Mechanical Properties Crosslinking Synthesis Chemistry Infrared Spectra Thermophysical Properties Polymeric Films Glass Transition Temperature Chromatography Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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