Butadiene-Styrene AB Type Block Copolymers
Few recent developments in polymer science have created more interest than the discovery of the so-called “thermoplastic elastomers”, block copolymers of the general structure AnBmAn, wherein A is a monomer whose polymer is glassy at ordinary temperatures, while monomer B forms a rubbery center block. These materials owe their unique properties to immiscibility of the two kinds of block sequences. The result is a two-phase domain structure in which the glassy domains assume the role of both crosslinks and reinforcing filler particles for the rubbery matrix composed of the center blocks. Thus, at ambient temperature the polymers resemble vulcanized, filler reinforced rubbers in reversible extensibility and strength. Above the glass transition of the A-blocks flow becomes possible — the polymers are true thermoplastics. The first, and most extensively investigated, polymers of this kind are those in which A is styrene and B is butadiene or isoprene.
KeywordsBlock Copolymer Random Copolymer Block Polymer Pressure Sensitive Adhesive Styrene Content
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