Accession Number : ADA119836

Title :   Torsional Braid Analysis (TBA): Time-Temperature-Transformation (TTT) Cure Diagrams of Thermosetting Epoxy/Amine Systems.

Descriptive Note : Technical rept. Aug 80-Aug 82,


Personal Author(s) : Enns,John B ; Gillham,John K

PDF Url : ADA119836

Report Date : Sep 1982

Pagination or Media Count : 60

Abstract : The conversion of liquid resin to solid thermoset during the process of cure can be monitored using a substrate coated with the reactive system as the specimen in a torsion pendulum experiment (TBA). Measurement of times to gelation and vitrification at a series of temperatures results in an isothermal time-temperature-transformation (TTT) cure diagram which can be used for comparing different systems. In this report molecular and macroscopic TTT cure diagrams are considered: it is demonstrated that TBA is a convenient method for generating macroscopic TTT cure diagrams. The influence of chemical structure on the kinetics and macroscopic properties was investigated by comparing aliphatic and aromatic tetrafunctional amines with diepoxides of varying molecular weights. The paper also describes automation of the TBA instrument using a desk-top calculator. (Author)

Descriptors :   *Polymers, *Braids, *Torsion, *Molecular structure, Measurement, Comparison, Liquids, Gelatins, Thermosetting plastics, Amines, Epoxy compounds, Pendulums, Temperature, Mechanical properties, Conversion, Isotherms, Substrates, Transitions, Plastics, Curing, Data processing, Microprocessors

Subject Categories : Textiles

Distribution Statement : APPROVED FOR PUBLIC RELEASE