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 Title: Synthesis and characterization of novel polymer-ceramic nanocomposites: Organoceramics Author(s): Messersmith, Phillip Byron Doctoral Committee Chair(s): Stupp, Samuel I. Department / Program: Materials Science and Engineering Discipline: Materials Engineering Degree Granting Institution: University of Illinois at Urbana-Champaign Degree: Ph.D. Genre: Dissertation Subject(s): Chemistry, Polymer Engineering, Materials Science Abstract: This manuscript describes the synthesis and characterization of novel polymer-ceramic nanocomposites (organoceramics) based on various water soluble polymers and calcium aluminate hydrates. Synthesis of these materials involves the aqueous precipitation of the inorganic crystals in the presence of polymer. The presence of polymer during crystallization often leads to changes in particle morphology, and in some cases intercalation.The organoceramics based on poly(vinyl alcohol) (PVA) and $\rm CaO{\cdot} Al\sb2O\sb3{\cdot} 10H\sb2O$ (CAH$\sb{10})$ were found to exhibit retarded phase transformation kinetics and unique particle morphologies. Intercalation of PVA between layers of $\rm\lbrack Ca\sb2Al(OH)\sb6\rbrack\sp+\lbrack(OH){\cdot} 3H\sb2O\rbrack\sp-$ occurred during crystal growth, resulting in an organoceramic containing up to 40% polymer by weight. Polymer intercalation resulted in an expression of the interlayer by approximately 10 A, consistent with the formation of a double layer of PVA chains across each interlayer. Thermal degradation of the inorganic and polymeric components of the organoceramic occurred at higher temperatures than the individual materials. Compressive strength of PVA organoceramic powder compacts was significantly higher than that of $\rm\lbrack Ca\sb2Al(OH)\sb6\rbrack\sp+\lbrack(OH){\cdot} 3H\sb2O\rbrack\sp-$ compacts, possibly reflecting substantial differences in particle morphologies. Issue Date: 1993 Type: Text Language: English URI: http://hdl.handle.net/2142/21638 Rights Information: Copyright 1993 Messersmith, Phillip Byron Date Available in IDEALS: 2011-05-07 Identifier in Online Catalog: AAI9314917 OCLC Identifier: (UMI)AAI9314917
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