Morphology and mechanical behavior of blends and diblock copolymers of 1,2 and 1,4 polybutadiene

Technical Report · Wed Feb 25 04:00:00 EST 1981

OSTI ID:5882362

Cohen, R E; Wilfong, D E

The structure and mechanical properties of a series of polymer blends and block copolymers comprised of medium cis 1,4-polybutadiene and 99% 1,2-polybutadiene have been investigated. Thermal properties (DSC) were determined at two levels of radiation crosslinking and for various sample preparation procedures (solvent and thermal history). Dynamic mechanical spectra (3.5 Hz) were measured over temperature range from 180 to 310K. Transmission electron microscopy was also used for establishing the number phases and the domain size and geometry in the heterogeneous materials. Stress-strain curves were determined for the various samples as a function of crosslink density and casting solvent. Equilibrium swelling ratios were measured for each specimen at the same radiation dose in a good solvent. Swelling values were also obtained in a series of solvents for the parent homopolymers and for a diblock copolymer containing 45% 1,2 polybutadiene.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA). Dept. of Chemical Engineering
• OSTI ID: 5882362
• Report Number(s): AD-A-096260/5; TR-7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360403* -- Materials-- Polymers & Plastics-- Mechanical Properties-- (-1987)
BUTADIENE
CHEMICAL REACTIONS
CROSS-LINKING
CRYSTAL STRUCTURE
DIENES
ELASTOMERS
ELECTRON MICROSCOPY
HYDROCARBONS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
MIXING
MORPHOLOGY
ORGANIC COMPOUNDS
POLYENES
POLYMERIZATION
POLYMERS
TRANSMISSION ELECTRON MICROSCOPY