Influence of water and high energy radiation on the thermal and spectroscopical characteristics of an epoxy
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
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
EPOXIDES
CHEMICAL REACTIONS
RADIATION CURING
WATER
ADSORPTION
CALORIMETRY
COBALT 60
ELECTRONS
EXPERIMENTAL DATA
GAMMA RADIATION
HYDROGEN
INFRARED SPECTRA
KEV RANGE 100-1000
MEV RANGE 01-10
PHASE STUDIES
THERMAL GRAVIMETRIC ANALYSIS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMICAL ANALYSIS
CHEMICAL RADIATION EFFECTS
CHEMISTRY
COBALT ISOTOPES
CURING
DATA
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
GRAVIMETRIC ANALYSIS
HYDROGEN COMPOUNDS
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KEV RANGE
LEPTONS
MEV RANGE
MINUTES LIVING RADIOISOTOPES
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADIOISOTOPES
SORPTION
SPECTRA
THERMAL ANALYSIS
YEARS LIVING RADIOISOTOPES
400600* - Radiation Chemistry
400104 - Spectral Procedures- (-1987)
400102 - Chemical & Spectral Procedures
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)