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| Thesis Name： |
Syntheses and surface analysis of novel poly(dimethylsiloxane) containingamphiphilic graft copolymers. |
| Usage： |
chemical industry |
| Keyword： |
poly(HEMA), poly(DHPMA), graft copolymers |
| Remarks： |
A series of novel amphiphilic graft copolymers consisting of a hydrophilicpoly(2-hydroxyethyl methacrylate) [poly(HEMA)] or poly(2,3-dihydroxypropyl methacrylate)[poly(DHPMA)] backbone and hydrophobic poly(dimethylsiloxane) (PDMS) side chains have beensynthesized. The graft copolymers were prepared via both photoinduced-radical and anionicpolymerization techniques. Using angle-dependent X-ray photoelectron spectroscopy (XPS), the effectsof the PDMS graft length, the PDMS bulk content and the MWD as well as the hydrophilicity of thebackbone on the surface composition of these graft copolymer films were investigated under both dryand wet conditions. It was found that for a given PDMS bulk content, a longer PDMS graft gives asurface richer in siloxane. However, the MWD has little effect on the air (free) surfacecomposition. With increasing PDMS bulk content, the PDMS surface concentration increases forpoly(HEMA-g-DMS) graft copolymers, but no significant difference was observed forpoly(DHPMA-g-DMS)s. As expected, upon exposure to water, the amphiphilic graft copolymers underwenta dramatic surface structure reorganization.; An additional study is reported on evaluation of thepotential of hybrid films to support adhesion and proliferation of primary respiratiory epithelialcell. A series of collagen/PVA hybrid films with different weight percent ratio were prepared. Thesurface composition of these films were investigated by using angular-dependent XPS. The resultsshowed that the PVA component dominated the free surface even for the film with higher ratio ofcollagen component. It was found that with increasing sampling depth, the concentration of collagewithin the surface region slightly increases. The cell culture experiment results showed that thehybrid films supported more robust cell growth than either pure materials.
Author:Hou, Yuanxue.
Units:State University of New York at Buffalo. |
| Original file： |
No File
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Promulgator Detail |
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administrator |
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CN |
| City: |
Dalian |
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teloon Soft Strategy Co.,LTD |
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