Radiation chemical effects on polybutadiene polymers, styrene-butadiene block copolymers, and isotactic polypropylene
Thesis/Dissertation
·
OSTI ID:6203321
Electron spin resonance (ESR) of the free radical structure resulting from high energy gamma LNT irradiation of the polymers revealed the presence of allylic free radicals of the type approx. CH.CH = CH.CH/sub 2/ approx. The presence of chemically trapped electrons in polybutadiene and styrene-butadiene (SB) block copolymers irradiated in the absence of light at LNT was determined by ESR measurements, and the trapping sites were shown to be impurities or additive molecules which were imbedded in between the polymer chains and which had not been completely removed by purification. Reaction kinetic studies of free radical decay indicated that the decay followed the equation derived for the case in which some free radicals decay by a second order mechanism in the presence of nondecaying free radicals. The same reaction scheme was found to describe the kinetics of alkyl free radical decay in LNT irradiated quenched and annealed isotactic polypropylene with the decay rate of quenched samples being higher than for annealed samples. Results of studies of radiation-induced crosslinking of the elastomers are also included. (BLM)
- Research Organization:
- Baylor Univ., Waco, TX (USA)
- OSTI ID:
- 6203321
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ANNEALING
BUTADIENE
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMISTRY
DECAY
DIENES
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
GAMMA RADIATION
HEAT TREATMENTS
HYDROCARBONS
IONIZING RADIATIONS
KINETICS
MAGNETIC RESONANCE
MATERIALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYENES
POLYMERS
POLYOLEFINS
POLYPROPYLENE
POLYSTYRENE
POLYVINYLS
QUENCHING
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
REACTION KINETICS
RESONANCE
SYNTHETIC MATERIALS
400600* -- Radiation Chemistry
ANNEALING
BUTADIENE
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMISTRY
DECAY
DIENES
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
GAMMA RADIATION
HEAT TREATMENTS
HYDROCARBONS
IONIZING RADIATIONS
KINETICS
MAGNETIC RESONANCE
MATERIALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYENES
POLYMERS
POLYOLEFINS
POLYPROPYLENE
POLYSTYRENE
POLYVINYLS
QUENCHING
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
REACTION KINETICS
RESONANCE
SYNTHETIC MATERIALS