Synthesis and Properties of Some Characteristic Elastomers
Along our studies, three sorts of characteristic elastomers are described in this review focusing on their synthesis, structure and properties.
A novel moisture-curable rubber and a high performance lignin-reinforced rubber with good processability were obtained by using newly developed 1-chloro-1,3-butadiene — 1,3-butadiene rubber (CB-BR) derived from the copolymerization of 1-chloro-l,3-butadiene (CB) and 1,3-butadiene by emulsion process.
The ionene-type viologen elastomers having poly(butadiene-co-acrylonitrile) (NBV) were obtained by the reaction of α,α’-dichloro-p-xylene (DCX), 4,4’-bipyridine (BP) and dimethylamine-terminated liquid nitrile rubber (AT-NBR). The tensile properties of these elastomers were found to depend upon the number of cation-site in a structural unit of the ionene, and to attain 46 MPa in tensile strength and 340% in elongation at break without any reinforcement and vulcanization.
Two sorts of ABA type liquid crystalline elastomers terminated with mesogenic groups were synthesized. The polymeric segment of B is polyolefin with molecular weight of about 2500. Mesogenic groups of A carring two or three phenylene groups combined by ester linkage, were prepared by the reaction of terephthalic acid and p-hydroxybenzoic acid. These polymers were liquid crystalline and could be formed into elastic films. Their thermal and mechanical properties were clarified.
KeywordsMicrophase Separation Terephthalic Acid Dibutyltin Dilaurate Mesogenic Group Elastic Film
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