Show simple item record

dc.contributor.advisorBlanda, Michael T.
dc.contributor.authorWelsch, Rodney L. ( )
dc.identifier.citationWelsch, R. L. (2000). Hydrosilation polymerization in supercritical carbon dioxide (Unpublished thesis). Southwest Texas State University, San Marcos, Texas.

Supercritical carbon dioxide (ScC02) has a number of unique and beneficial properties that have been utilized in several polymerization reactions. This thesis comprises the novel approach of the formation of polysilanes and siloxanes via the hydrosilation reaction in ScC02. The research involved the synthesis of two new, fluorine-containing, vinyl-functonalized monomers: 1,3-bis(hexafluoro-2-propenyloxy-2-propyl) benzene and 1,3-bis[hexafluoro-2-(9- decenyloxy-2-propyl)] benzene. These monomers were chosen as coreactants with a series of commercially available dihydride-silanes/siloxanes, because polysiloxanes and fluoropolymers have been shown to be particularly soluble in ScC02. The polymerization was carried out in two solvents: ScC02 and the traditional organic solvent, benzene. The polymers were characterized by standard characterization techniques: solubility, nuclear magnetic resonance spectroscopy (NMR, proton and carbon), infrared spectroscopy (IR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), gel permeation chromatography (GPC), water contact angle, and inherent viscosity.

The polymers showed good solubility in organic solvents. The polymers formed in ScCC>2 have as high or higher molecular weights than those obtained in organic solvent. Inherent viscosities were low, ranging from .02 to .05 dl_/g. The decyl polymers have lower glass transition temperatures, and are more thermally stable than propyl polymer. Water contact angles ranged from 60 to 90°.

dc.format.extent251 pages
dc.format.medium1 file (.pdf)
dc.subjectCarbon dioxide
dc.titleHydrosilation polymerization in supercritical carbon dioxide
dc.contributor.committeeMemberCassidy, Patrick E.
dc.contributor.committeeMemberKoo, Joseph Texas State University of Science
dc.description.departmentChemistry and Biochemistry


This item is restricted to the Texas State University community. TXST affiliated users can access the item with their NetID and password authentication. Non-affiliated individuals should request a copy through their local library’s interlibrary loan service.

This item appears in the following Collection(s)

Show simple item record