REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED FILLERS
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| Language: | English |
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University of Cincinnati / OhioLINK
2003
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=ucin1068736103 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-ucin10687361032021-08-03T06:09:17Z REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED FILLERS PAN, GUIRONG polyhedral Oligomeric Silsesquioxane Siloxane elastomer nanocomposites mechanical properties reinforcement Inorganic-organic hybrid materials can provide excellent combined properties. And when the length scale of the component phase approaches nanometers, the expected global properties will be more strongly affected by interfacial interactions rather than bulk phase properties. Polyhedral oligomeric silsesquioxane (POSS) is an entirely new inorganic component that has defined structure and functional groups; thus POSS opens the possibility of preparing nanocomposites with controlled morphology and tailored interfaces. POSS systems can be developed to elucidate the effect of the structure and interfacial bonding on polymer microstructure and the resulting effects on macroscopic properties. The first section of this thesis reports the use of monovinyl POSS as a building block to make controlled-structure materials. Four POSS cages with vinyl groups were linked to a central siloxane core using a hydrosilylation reaction. The hydrosilylation reaction was monitored using fourier-transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance (1H-NMR). The resulting structure was confirmed by mass spectroscopy (MALDI-MS). In the second section, POSS was incorporated into poly(dimethylsiloxane) (PDMS) physically and chemically to investigate the effect of polymer-filler bonding. For physically blended composites, single POSS molecules and the molecules with up to four connected POSS (tetraPOSS) were used. The goal was to investigate the size effect on the reinforcement. In the chemically-bonding system, vinyl terminated PDMS was used; therefore, some POSS molecules were attached to the network through the hydrosilylation reaction. Both tensile tests and dynamic mechanical analysis showed that simply blending these POSS-based fillers into silanol-terminated PDMS had little effect on its mechanical properties, but bonding them to the PDMS provided considerable reinforcement. Based on these results, it seems that the reinforcement results not from direct bonding, but rather from the improved dispersion that indirectly results from bonding. 2003 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1068736103 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1068736103 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
polyhedral Oligomeric Silsesquioxane Siloxane elastomer nanocomposites mechanical properties reinforcement |
| spellingShingle |
polyhedral Oligomeric Silsesquioxane Siloxane elastomer nanocomposites mechanical properties reinforcement PAN, GUIRONG REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED FILLERS |
| author |
PAN, GUIRONG |
| author_facet |
PAN, GUIRONG |
| author_sort |
PAN, GUIRONG |
| title |
REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED FILLERS |
| title_short |
REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED FILLERS |
| title_full |
REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED FILLERS |
| title_fullStr |
REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED FILLERS |
| title_full_unstemmed |
REINFORCEMENT OF SILOXANE ELASTOMER WITH POSS BASED FILLERS |
| title_sort |
reinforcement of siloxane elastomer with poss based fillers |
| publisher |
University of Cincinnati / OhioLINK |
| publishDate |
2003 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1068736103 |
| work_keys_str_mv |
AT panguirong reinforcementofsiloxaneelastomerwithpossbasedfillers |
| _version_ |
1719431833671696384 |