Accession Number:

ADA050478

Title:

Torsional Pendulum Study on Several Epoxy/Diamine Polymers,

Descriptive Note:

Corporate Author:

NAVAL SURFACE WEAPONS CENTER WHITE OAK LAB SILVER SPRING MD

Personal Author(s):

Report Date:

1977-10-31

Pagination or Media Count:

30.0

Abstract:

The purpose of this study is to determine the thermomechanical properties by using the torsional pendulum on the following epoxies diglycidyl ether of bisphenol A, resorcinol diglycidyl ether, and butanediol diglycidyl ether with the following diamines propanediamine, hexanediamine, dodecanediamine, and m-phenylenediamine. There were at most three transitions in the temperature range of -150 to 200 C. The glass transition was strongly influenced by the degree of aromaticity and chain length of the amine monomers. The activation energies of the gamma transition were between 17 and 29 kcalmole. The gamma transition which occurs at -55 C at 1 Hz, dominated the ultrasonic properties of these polymers around room temperature. The torsional pendulum was shown to be a convenient method to determine the ultrasonic properties of polymers provided the activation energies of the gamma transition are known. Author

Subject Categories:

  • Plastics
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE