Evaluation of Diene-Type Elastomers for Oil and Solvent Resistance and Low Temperature Flexibility

Relationship between Molecular Structure and Physical Properties

“…polybutadiene to nearly 80% for one reacted at -19°C. At this lower temperature, practically all of the 1,4 units were in the trans form (36).…”

“…A great deal of work has been done with experimental copolymers of butadiene and polar vinyl compounds to determine the possibilities in securing both good oil resistance and low temperature flexibility. Apparently acrylonitrile is as satisfactory a monomer for this purpose as any that was tried (36).…”

“…The enhanced tendencies of the low temperature polymers to crystallize are ample proof of improved regularity of chain structure. Infrared analysis (34,36,38) has shown that the 1,2 content decreases only a fewper cent with lower polymerization temperatures, so that this type of irregularity still persists in cold rubber essentially unchanged in character. On the other hand, considerable improvement in regularity is brought about b)r increased proportions of trans structure at lower polymerization temperatures.…”

Elastomers

“…Since the aircraft and automotive industries require an elastomer that is flexible at low temperatures and that maintains its dimensions and physical properties after prolonged contact with various fuels and oils, and since existing polymers do not meet these exacting requirements, a large number of experimental polymers were made and their compounds examined (74).…”