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- W2142300321 abstract "Cationic copolymerization of isoprene with styrene in n-heptane or benzene medium leads to copolymers in which isoprene units are linked to form cyclic segments. The kinetic course depends on the nature of the solvent. Relative monomer reactivity ratios determined in both solvents show that in n-heptane styrene is the more reactive monomer, the reverse being true in benzene. It is concluded that the presence of benzene molecules favors the addition of isoprene to the active complex or to the cation. The extremely low value of the r1r2 product is not believed to indicate the tendency to alternation and is attributed to the special mechanism of cycloaddition. Polymerization of isoprene which leads to an equilibrium stage with low or zero reaction rate can be re-established when styrene is added to the system in equilibrium. In this case formation of block copolymers results. The copolymerization is accompanied by an intensive chain transfer with polymer and the formation of highly crosslinked products. Grafted or crosslinked polymers can also be prepared by the polymerization of isoprene in the presence of polystyrene. Copolymers of isoprene with styrene prepared cationically in benzene are of low molecular weight. Higher amounts of isoprene units in copolymers result in an increase of the melting temperature." @default.
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- W2142300321 date "1968-01-01" @default.
- W2142300321 modified "2023-09-28" @default.
- W2142300321 title "Cyclo- and cyclized diene polymers. XV. Cationic copolymerization of isoprene with styrene" @default.
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- W2142300321 doi "https://doi.org/10.1002/polc.5070230140" @default.
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