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- W1993441776 abstract "When macroscopic crystalline monomers were polymerized by a free-radical solid-state reaction in the presence of supercritical CO2 (scCO2), the resultant products were found to be composed of unexpected nanoparticle morphologies. In particular, the solid-state polymerization (SSP) of amino acid based monomers, acryloyl-β-alanine (ABA) and methacryloyl-β-alanine (MBA), initiated by azobisisobutyronitrile in scCO2 (at 65 °C and 34.5 MPa), produced corresponding polymers having aggregated spherical architectures. The average diameters of the PABA and PMBA particles were measured to be 94 and 102 nm, respectively. In addition, high molecular weight polymers (PMBA, Mw = 3.8 × 105 g/mol) with a high yield (∼96%) were obtained. The microscopic investigation revealed that a unique particle formation mechanism was involved in the SSP in which large sized crystalline monomers were chipped into small pieces during the initial stage of polymerization and subsequently converted into nanoscale objects after 24 h." @default.
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- W1993441776 date "2009-12-01" @default.
- W1993441776 modified "2023-10-06" @default.
- W1993441776 title "Polymeric nanoparticles from macroscopic crystalline monomers by facile solid-state polymerization in supercritical CO2" @default.
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- W1993441776 doi "https://doi.org/10.1016/j.supflu.2009.08.016" @default.
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