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- W2068219658 abstract "Abstract A series of α‐alkylacrylates, including methyl ethacrylate (MEA), methyl α‐propylacrylate, methyl α‐isopropylacrylate (M i PA), methyl α‐butylacrylate (M n BA), and methyl α‐isobutylacrylate (M i BA), were successfully polymerized at 65 °C under high pressure (1–9 kbar). In contrast to results obtained at ambient pressure, all monomers yielded high molecular weight polymers (number‐average molecular weight = 4–18 × 10 4 ), except for M i PA (number‐average molecular weight = 8 × 10 3 ), probably because of the high steric hindrance of the isopropyl group. Polymerization kinetics under high pressure were obtained for MEA, M n BA, and M i BA. Overall activation volumes were estimated to be −14.9, −17.0, and −11.6 mL mol −1 for MEA (3–7 kbar), M n BA (3–7 kbar), and M i BA (5–9 kbar), respectively. Extrapolation to ambient pressure provided rates of polymerization for these monomers unaffected by the ceiling temperature effect. These values were further used to quantitatively assess the steric influence exerted by the α‐substituent on the polymerizability of these sterically congested acrylates with Meyer's steric parameter. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 836–843, 2002; DOI 10.1002/pola.10161" @default.
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- W2068219658 date "2002-02-05" @default.
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- W2068219658 title "Polymerization of sterically congested ?-alkylacrylates under high pressure" @default.
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