Virginia Tech
Fabrication and characterization of poly(amide-imides)/TiO₂ nanocomposite gas separation membranes
Abstract
dc:description.abstractNanosized Ti0₂ rich domains were generated in-situ within poly(amide-imide) (PAl) and 6F-poly(amide-imide) (6FPAl) by a sol-gel process. The composite films showed a high optical transparency. The morphology of the Ti0₂ rich domains was observed by transmission electron microscopy (TEM). The Ti0₂ rich domains were well dispersed within the poly(amide-imide) and 6F-poly(amide-imide) matrices and were 5 nm to 50 nm in size. Limited study was also carried out for the fabrication of the P AI/Si0₂ and PAI/fi0₂-Si0₂ composites. It was found that nanosized Si0₂ rich domains were difficult to form within the poly(amide-imide) matrix, although the Si0₂ could be bonded with the Ti0₂, forming nanosized domains within the poly(amide-imide) matrix. The PAI/Ti0₂ composites showed an increased glass transition temperature, and an increased rubbery plateau modulus, in comparison to the unfilled poly(amide-imide). Wide Angle X- ray Diffraction (W AXD) study and Differential Scanning Calorimetry (DSC) analysis suggest that the Ti0₂ filled poly( amide-imide) have a lower crystallinity as compared to the unfilled poly(amide-imide). The dynamic mechanical properties in rubbery regions suggest that Ti0₂ domains function as physical crosslinks, increasing the rubbery plateau modulus with increasing Ti0₂ content. This behavior can be explained by the theory of rubbery elasticity. The actual formation of the nanosized Ti0₂ and Ti0₂-Si0₂ rich domains was explained in terms of hydrogen bonding effects between the polymer, the solvent and the inorganic components.
Degree
thesis:*- Name thesis:degree_name
- Ph. D.
- Level thesis:degree_level
- doctoral
- Discipline thesis:degree_discipline
- Chemical Engineering
- Department dc:contributor.department
- Chemical Engineering
- Grantor dc:publisher
- Virginia Tech
- Year dc:date.issued
- 1996
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Hu, Qingchun
- Chair dc:contributor.committeechair
-
- Marand, Eva
- Committee members dc:contributor.committeemember
-
- Davis, Richey M.
- Kander, Ronald G.
- Marand, Hervé L.
- Wilkes, Garth L.
Subjects
dc:subject × 6Rights
dc:rights- Statement dc:rights
-
- In Copyright
- Licence dc:rights.uri
- Language dc:language.iso
- en
Identifiers
dc:identifier.*- Dc Identifier Other
- etd-10022008-063009
- OAI identifier oai:identifier
- oai:vtechworks.lib.vt.edu:10919/39534