Morphology and mechanical properties of radiation-polymerized urethane-acrylates. I. Pure oligomers. [Electron beams and gamma radiation of acrylo-urethane oligomers]
The morphology of electron beam cured polyacrylo-urethane films based on polyethylene adipate and toluene diisocyanate was characterized to explain their mechanical properties. The polyacrylo-urethane films have a one-phase morphology in which the hard urethane segments and the soft polyester segments are homogeneously mixed. The films obtained from 1000-molecular-weight oligomer are hard and somewhat brittle due to their one-phase morphology in which hard glassy segments play a dominant role. The films obtained from 4600- and 6000-molecular-weight oligomers are soft and tough, once again due to their one-phase morphology in which soft rubbery segments are more effective. The original crystalline structure of 6000-molecular-weight oligomer is retained in the precrystallized ..gamma..-irradiated film, but electron-beam-irradiated films showed partial melting of the crystallites due to the heat of polymerization. The solid state polymerized films have a lower elongation, a higher modulus, and a higher breaking strength due to their crystallinity.
- Research Organization:
- North Carolina State Univ., Raleigh
- OSTI ID:
- 5810150
- Journal Information:
- J. Appl. Polym. Sci.; (United States), Vol. 27:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
ACRYLIC ACID ESTERS
CHEMICAL RADIATION EFFECTS
POLYURETHANES
MORPHOLOGY
TENSILE PROPERTIES
URETHANE
ELECTRON BEAMS
EXPERIMENTAL DATA
GAMMA RADIATION
BEAMS
CARBAMATES
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACID ESTERS
CARBOXYLIC ACID SALTS
CHEMISTRY
DATA
ELECTROMAGNETIC RADIATION
ESTERS
INFORMATION
IONIZING RADIATIONS
LEPTON BEAMS
MATERIALS
MECHANICAL PROPERTIES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
PARTICLE BEAMS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYAMIDES
POLYMERS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
SYNTHETIC MATERIALS
360406* - Materials- Polymers & Plastics- Radiation Effects- (-1987)
400600 - Radiation Chemistry