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• W2024529968 abstract "Abstract A novel catalyst composed of neodymium (III) isopropoxide [Nd(OiPr) 3 ] and methylaluminoxane (MAO) was examined in isoprene polymerization. The Nd(OiPr) 3 ‐MAO catalyst proved to be highly effective in heptane even at low [Al]/[Nd] ratios (ca. 30) to give polyisoprene that possessed high cis ‐1,4 stereoregularity (> ca. 90%), a high number‐average molecular weight ( M n ∼10 5 ), and relatively narrow molecular weight distributions ( M w / M n = 1.9–2.8). The catalyst activity increased with an increasing [Al]/[Nd] ratio from 10 to 80 as well as temperature of aging and polymerization from 0 to 60 °C. The polymerization proceeded in the first order with respect to the monomer concentration. Aliphatic solvents (heptane and cyclohexane) achieved a higher yield and M n of polymer than toluene as a solvent. The M w / M n ratio remained around 2.0, and the gel permeation chromatographic curve was always unimodal, indicating that this system is homogeneous and involves a single active site. The microstructure of polyisoprene was determined by IR, 1 H NMR, and 13 C NMR. The cis ‐1,4 contents of the final polymers stayed in the range of 90–92%, regardless of reaction conditions, indicating the high stability of stereospecificity of the catalyst. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 1838–1844, 2002" @default.
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• W2024529968 date "2002-04-17" @default.
• W2024529968 modified "2023-10-18" @default.
• W2024529968 title "Novel neodymium (III) isopropoxide-methylaluminoxane catalyst for isoprene polymerization" @default.
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• W2024529968 doi "https://doi.org/10.1002/pola.10260" @default.
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