{"id":{"repo_id":"aachen","oai_identifier":"oai:publications.rwth-aachen.de:60657"},"canonical_url":"https://search.dev.ndltd.org/etd/aachen/oai:publications.rwth-aachen.de:60657","repository":{"repo_id":"aachen","name":"RWTH Aachen University","base_url":"https://publications.rwth-aachen.de/oai2d"},"display":{"title":"Solubility of fluorinated polymers in supercritical carbon dioxide","abstract":"This thesis at hand concerned with novel determination of the solubility (liquid/liquid demixing), and crystallization (liquid/solid demixing) of fluorinated polymers in supercritical carbon dioxide by cloud point technique. Due to great importance of semicrystalline PVDF, in particular solubility of this polymer in CO2 has been investigated in detail either through isothermal depressurization (precipitation) or isobaric expansion (crystallization) procedure technique. The crystallization (liquid/solid) and precipitation (liquid/liquid) demixing lines of polyvinylidene fluoride in carbon dioxide were studied in temperature and pressure ranges between 110-190°C and 1400-2100 bar, respectively. While the first procedure yielded a solid polymer having micro-porous sponge like morphology containing of interconnected macrovoids, the latter method resulted in fine powders with lamellar structure of typical chain folded crystal, the crystalline powder is characterized by particle diameters in the range of 5-20 µm.","abstract_html":"This thesis at hand concerned with novel determination of the solubility (liquid/liquid demixing), and crystallization (liquid/solid demixing) of fluorinated polymers in supercritical carbon dioxide by cloud point technique. Due to great importance of semicrystalline PVDF, in particular solubility of this polymer in CO2 has been investigated in detail either through isothermal depressurization (precipitation) or isobaric expansion (crystallization) procedure technique. The crystallization (liquid/solid) and precipitation (liquid/liquid) demixing lines of polyvinylidene fluoride in carbon dioxide were studied in temperature and pressure ranges between 110-190°C and 1400-2100 bar, respectively. 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Due to great importance of semicrystalline PVDF, in particular solubility of this polymer in CO2 has been investigated in detail either through isothermal depressurization (precipitation) or isobaric expansion (crystallization) procedure technique. The crystallization (liquid/solid) and precipitation (liquid/liquid) demixing lines of polyvinylidene fluoride in carbon dioxide were studied in temperature and pressure ranges between 110-190°C and 1400-2100 bar, respectively. While the first procedure yielded a solid polymer having micro-porous sponge like morphology containing of interconnected macrovoids, the latter method resulted in fine powders with lamellar structure of typical chain folded crystal, the crystalline powder is characterized by particle diameters in the range of 5-20 µm."]},{"key":"dc:source","label":"Dc Source","values":["Aachen : Publikationsserver der RWTH Aachen University IV, 129 S. : Ill., graph. Darst. (2006). = Aachen, Techn. 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