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- W1517650654 abstract "Restriction of β-elimination in polystyrene-lithium (PSLi) in the block copolymerization of polystyrene with poly(ethylene-co-propene) catalyzed with PSLi/TiCl4 (resulting in sample A-2) by adding a spacer of a few monomeric units of isoprene (I) (PS-InLi/TiCl4 (n ≤ 3)); resulting in sample A-3), was evidenced by a M̄w/M̄n-value of 2,67 lower than that of sample A-2, and a crystallinity (χ) of 7,4% in the poly(ethylene-co-propene) (EPR) block in sample A-3. These, together with shorter ethylene (E)-sequences EEEn≥1, 27,6%) and a higher content of inverted propylene units (P) make the EPR-block in A-3 look like a polymer obtained with a soluble vanadium catalyst. This is due to the solubilization of the active centers by the PS chains. Higher M̄w/M̄n-values (4,23) and crystallinity of the EPR block (18,3%) and longer EEEn≥1 sequences (55,4%) in the case of sample A-2 make it to look like a typical polymer as obtained with a heterogeneous Ti-catalyst. Comparison of sample A-3 with that obtained by E-P copolymerization with BuLi/TiCl4 (sample A-1) corroborates the solubilization effect of PS in A-3 and the effects of the typical heterogeneous catalyst used for the preparation of A-1, showing up in EEEn≥1 (A-1: 63,4% A-3: 27,6%), M̄w/M̄n (A-1: 35,7; A-3: 2,67) and P̄ (A-1: nil; A-3: 4%)." @default.
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- W1517650654 date "1990-08-01" @default.
- W1517650654 modified "2023-09-27" @default.
- W1517650654 doi "https://doi.org/10.1002/macp.1990.021910803" @default.
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