Influence of water and high energy radiation on the thermal and spectroscopical characteristics of an epoxy

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5524702

Netravali, A N

The epoxy system formed by tetraglycidyl 4,4'-diamino diphenyl methane (TGDDM) and 4,4'-diamino diphenyl sulfone (DDS) (73/27, W/W) was characterized using differential scanning calorimetry, thermo-gravimetric analysis and infrared spectroscopy. Two different curing procedures were used. The effect of water and high energy ionizing radiation (0.5 MeV electron and /sup 60/Co ..gamma..) on the cured epoxy was studied. The results established that water pick-up increases with the extent of cure. The sorbed water plasticizes the epoxy lowering the glass transition temperature. At ambient temperature, the plasticization is reversible. At 70/sup 0/C, part of the sorbed water reacts with the epoxide rings. When soaked at 70/sup 0/C for extended periods of time, water causes permanent damage in the physical and chemical nature of the epoxy. As a result, the glass transition temperature is permanently lowered. The hydrogens in water exchange with the hydrogens on the hydroxyl and amine groups in the epoxy. Low molecular weight species leach out during soaking. Exposure to either 0.5 MeV electron and /sup 60/Co ..gamma.. radiation causes further crosslinking in a cured epoxy. Water pick-up increases with the increase in the electron radiation dose. Electron irradiation also causes some chemical degradation.

• Research Organization: North Carolina State Univ., Raleigh (USA)
• OSTI ID: 5524702
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400102 -- Chemical & Spectral Procedures
400104 -- Spectral Procedures-- (-1987)
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
400600* -- Radiation Chemistry
ADSORPTION
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALORIMETRY
CHEMICAL ANALYSIS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COBALT 60
COBALT ISOTOPES
CURING
DATA
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
EPOXIDES
EXPERIMENTAL DATA
FERMIONS
GAMMA RADIATION
GRAVIMETRIC ANALYSIS
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
INFRARED SPECTRA
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KEV RANGE
KEV RANGE 100-1000
LEPTONS
MEV RANGE
MEV RANGE 01-10
MINUTES LIVING RADIOISOTOPES
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
PHASE STUDIES
QUANTITATIVE CHEMICAL ANALYSIS
RADIATION CHEMISTRY
RADIATION CURING
RADIATION EFFECTS
RADIATIONS
RADIOISOTOPES
SORPTION
SPECTRA
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
WATER
YEARS LIVING RADIOISOTOPES