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• W2115619503 abstract "Abstract The synthesis of acrylonitrile‐butadiene rubbers (NBRs) via trithiocarbonate‐mediated reversible addition fragmentation chain transfer (RAFT) polymerization of acrylonitrile (ACN) and 1,3‐butadiene (BD) in solution under azeotropic conditions (38/62) was investigated for a broad range of common solvents: N , N ‐dimethylacetamide (DMAc), chlorobenzene, 1,4‐dioxane, tert ‐butanol, isobutyronitrile, toluene, trimethylacetonitrile, dimethyl carbonate, acetonitrile, methyl acetate, acetone, and tert ‐butyl methyl ether. The gravimetrically determined conversions for the free radical polymerizations of ACN/BD after 22 h at 100 °C were in the range of 15% for methyl acetate to 35% for DMAc. The origin of the differences in conversion is attributed to the unequal decomposition behavior of the employed azo initiator 2,2′‐azobis( N ‐butyl‐2‐methylpropionamide) ( 1 ) in the solvents under investigation, as determined by ultraviolet–visible (UV–vis) spectroscopy. Relative decomposition of 1 in solution (0.1 mol L −1 ) at 100 °C was calculated from the UV–vis spectra for selected solvents. 90% of 1 in DMAc was decomposed after 22 h, 83% in tert ‐butanol, 57% in 1,4‐dioxane, 53% in isobutyronitrile, 45% in chlorobenzene, and 21% in toluene. The evolution of molecular weight with conversion using the initiator 1 was in accordance with the theoretically expected values, regardless of the solvent studied. Moreover, the RAFT‐mediated copolymerization of ACN/BD in DMAc with azo initiators 1 , 1‐[(1‐cyano‐1‐methylethyl)azo]formamide ( 2 ) and 1,1′‐azobis(cyclohexanecarbonitrile) ( 3 ) was investigated. A strong deviation from the linear evolution of molecular weight due to a fast decomposition of these initiators – congruent with high primary radical delivery rates – at the selected temperature was observed when using 2 and 3 . The deviation was not observed when using 1 . © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012" @default.
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• W2115619503 date "2011-10-28" @default.
• W2115619503 modified "2023-10-18" @default.
• W2115619503 title "A Detailed investigation of the experimental conditions for the reversible addition fragmentation chain transfer-mediated copolymerization of acrylonitrile and butadiene" @default.
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• W2115619503 doi "https://doi.org/10.1002/pola.25033" @default.
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