Accession Number : ADA952735

Title :   Polyimides.

Descriptive Note : Technical rept.,

Corporate Author : PRINCETON UNIV N J FRICK CHEMICAL LAB

Personal Author(s) : Cooper,S. ; Mair,D. ; Tobolsky,A. V.

Report Date : MAY 1965

Pagination or Media Count : 24

Abstract : THE MECHANICAL PROPERTIES OF FOUR DIFFERENT POLYIMIDE SAMPLES WERE COMPARED. POLY(N,N'(P.P'-OXYDIPHENYLENE) PYROMELLITIMIDE), SHOWS NO SOFTENING PHENOMENA BELOW 500 C. THE THREE OTHER POLYIMIDES STUDIED SHOW A DEFINITE SOFTENING AT ELEVATED TEMPERATURES. ALL OF THE SAMPLES INVESTIGATED SHOW EVIDENCE OF CHEMICAL REACTION AND EVENTUAL DEGRADATION TAKING PLACE ABOVE 400 C. X-RAY PHOTOGRAPHS SHOW H-FILM TO BE SLIGHTLY CRYSTALLINE. THE OTHER MEMBERS OF THE POLYIMIDE GROUP INVESTIGATED REVEAL A TYPICAL AMORPHOUS SCATTERING PATTERN. FACTORS SUCH AS THE PURITY OF STARTING MATERIALS AND THE PROBLEM OF COMPLETE CONVERSION TO POLYIMIDE LINKAGE MUST BE CONSIDERED WHEN COMPARING THE MECHANICAL PROPERTIES OF THESE VARIOUS POLYIMIDES. (AUTHOR-PL).

Descriptors :   *Polyimide resins, Mechanical properties, Softening, Softening points, High temperature, Degradation, Chemical reactions, Amorphous materials, Purity, X ray photography, Crystallization, Linkages

Subject Categories : Plastics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE