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Experimental Investigation of the Morphology Formation of Polymer Particles in an Acoustic Levitator
Author(s) -
Sedelmayer Robert,
Griesing Matthias,
Halfar Annelie Heide,
Pauer Werner,
Moritz HansUlrich
Publication year - 2013
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201300088
Subject(s) - relative humidity , materials science , emulsion polymerization , polymerization , polymer chemistry , chemical engineering , butyl acrylate , ammonium persulfate , ammonium sulfate , styrene , particle (ecology) , morphology (biology) , dispersion (optics) , polymer , precipitation polymerization , composite material , radical polymerization , methyl methacrylate , copolymer , thermodynamics , oceanography , physics , genetics , optics , biology , engineering , metallurgy , geology
Summary Droplet polymerization of N‐vinyl‐2‐pyrrolidone (NVP) and sodium acrylate (NaAA) was carried out in an acoustic levitator for different ambient temperatures and relative humidities. The resulting particle morphologies were compared to particles of two crystalline systems (mannitol and ammonium sulfate) and two disperse systems (silica and styrene ‐ butyl acrylate dispersion), all obtained under similar drying conditions. NVP was found to form a higher amount of crystals with lower temperature and relative humidity, contrary to the behaviour observed for mannitol and ammonium sulfate. The processes of both, polymerization and drying of NaAA lead to similar morphologies at low temperatures and humidities, probably caused by the precipitation of NaAA during polymerization.