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Enhancement of the activity of a neodymium catalyst for the synthesis of stereoregular polyisopreneRussian Journal of Applied Chemistry, 85
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Kinetic inhomogeneity of titanium- and neodymium-based catalysts for the production of cis-1,4-polyisopreneRussian Journal of Physical Chemistry B, 9
Gui-lian Li, Changyou Ren, Weimin Dong, Liansheng Jiang, Xuequan Zhang, Fo-song Wang (2010)
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cis-1,4-Polyisoprene was prepared under conditions of the industrial production process using small high-performance diffuser–confuser tubular turbulent apparatuses in the stage of formation of titanium, neodymium, and gadolinium Ziegler–Natta catalysts, and characteristics of the synthesized rubber were determined. The catalytic systems can be ranked in the following order with respect to the content of cis-1,4-units in the synthesized polyisoprene: titanium (96.3%)–neodymium (97.5%)–gadolinium (99%); the polyisoprene obtained on lanthanide catalysts contains no trans-1,4-units. The mean molecular masses of polyisoprene increase in the same order, whereas the polydispersity coefficient varies insignificantly. Natural rubber compared to synthetic analogs contains virtually no thermally stable compounds, is characterized by higher surface microhardness, and contains about 1% volatiles.
Russian Journal of Applied Chemistry – Springer Journals
Published: Aug 9, 2021
Keywords: cis-1,4-polyisoprene; titanium catalyst; lanthanide catalyst; thermal gravimetric analysis; diffuser–confuser turbulent apparatus
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