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Опубликовано 2010-08-05 Опубликовано на SciPeople2010-11-07 02:55:40 ЖурналMaterials and manufacturing Processes

Synthesis of powdered polymeric microparticles by using supercritical carbon dioxide (sc-CO2) as polymerizing medium
I.R. Kamrupi and S.K. Dolui / Isha Kamrupi
DOI: 10.1080/10426914.2010.491008
Аннотация We have synthesized microparticles of polymer by emulsion polymerization of styrene in supercritical carbon dioxide (sc-CO2) using (polydimethylsiloxane) (PDMS) as a surfactant/stabilizer and azobisisobutyronitrile (AIBN) as initiator. The emulsion polymerization was carried out at different pressures (2000-2600 psi). At the end of polymerization, powdered polymeric micoparticles were collected by depressurizing CO2. The powdered polymeric microparticles were characterized by SEM, GPC, DSC and TGA. The influence of pressure on conversion, molecular weight, particle size and polydispersity index was studied. The molecular weight (Mn) of the polymer is in the range of 35,542 to 45,078 g/mol. Polydispersity is in the range of 1.45-1.86 and particle size in the range of 3.25m-6.3m.
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