Solubility of fluorinated polymers in supercritical carbon dioxide

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.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2006

Author dc:creator

• Fahmy, Sherif Medhat

Contributors dc:contributor

• Möller, Martin

• info:eu-repo/classification/ddc/540
• Chemie
• Fluoropolymer
• Cloud point
• Crystallization
• Supercritical Carbon dioixde

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

eng

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-122355%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:60657