Isoprene-containing diblock/triblock

Nanocomposites Based on Partially Hydroxylated Isoprene-or Butadiene-Containing Diblock and Triblock Copolymers... 

Barbier-Baudry [147,148,185-188] studied in detail the ani a-samarocene allyl and chloride complexes 91-93 (Fig. 14) as the single-component catalysts for the copolymerization of a series of a-oleflns with conjugated dienes. The resultant copolymers contained about 6% linear a-oleflns. Each olefin unit randomly inserted between two tran5-l,4-isoprenes. It was worth noting that the afforded copolymers with different precatalysts were characterized with almost the same properties, denoting the same catalytic active species formed during polymerization [147,186]. In addition, these catalysts were able to copolymerize isoprene with e-caprolactone to form diblock copolymers [186,187] and triblock copolymer poly[isoprene-ct -... 

A block copolymer is a macromolecule that is composed of distinct sections of different chemical species that are chemically bonded together to form a single molecule. The simplest kind is a diblock copolymer, with two blocks, such as poly(styrene>-fe-poly(isoprene), or PS- -PI. A general label for a diblock copolymer is A-fe-B, or simply AB. There are also triblock copolymers that can contain either two or three different species, for example, ABA or ABC, linear multiblocks, for example, ABAB..., and more complicated architectures, such as starblocks or graft copolymers. These are illustrated schematically in Figure 1. 

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