Accession Number : ADA183385

Title :   Time-Temperature-Transformation (TTT) Cure Diagrams: Relationship between Tg and the Temperature and Time of Cure for a Polyamic Acid/Polyimide System.

Descriptive Note : Technical rept. no. 12, 31 Dec 84-31 Dec 86,

Corporate Author : PRINCETON UNIV NJ DEPT OF CHEMICAL ENGINEERING

Personal Author(s) : Palmese,G R ; Gillham,J K

PDF Url : ADA183385

Report Date : Jul 1987

Pagination or Media Count : 36

Abstract : Glass transition temperatures (Tg) were obtained versus isothermal temperature (Tcure) and time of cure for a polyamic acid/polyimide system. A time temperature-transformation (TTT) isothermal cure diagram was constructed to include the time to vitrification and iso-Tg curves. As for epoxies, the relationship between Tcure and the time to vitrification is S -shaped. Plots of Tg versus Tcure show that solvent evaporation and chemical reaction are controlled by vitrification. Keywords: Cure, Vitrification, Solvent evaporation, Polyimide, Polyamic acid.

Descriptors :   *POLYIMIDE RESINS, CHEMICAL REACTIONS, EPOXY COMPOUNDS, ISOTHERMS, TEMPERATURE, EVAPORATION, SOLVENTS, CONTROL, GLASS, TRANSITIONS, TIME

Subject Categories : Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE