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Modifications of epoxy resins for improved mechanical and tribological performances and their effects on curing kinetics.

Description: A commercial epoxy, diglycidyl ether of bisphenol-A, was modified by two different routes. One was the addition of silica to produce epoxy composites. Three different silane coupling agents, glycidyloxypropyl trimethoxy silane (GPS), -methacryloxypropyl trimethoxy silane (MAMS) and 3-mercaptopropyltriethoxy silane (MPS), were used as silica-surface modifiers. The effects of silica content, together with the effects of chemical surface treatment of silica, were studied. The results indicate … more
Date: May 2008
Creator: Chonkaew, Wunpen
Item Type: Refine your search to only Thesis or Dissertation

Characterization of Methyltrimethoxysilane Sol-Gel Polymerization and the Resulting Aerogels.

Description: Methyl-functionalized porous silica is of considerable interest as a low dielectric constant film for semiconductor devices. The structural development of these materials appears to affect their gelation behaviors and impact their mechanical properties and shrinkage during processing. 29Si solution NMR was used to follow the structural evolution of MTMS (methyltrimethoxysilane) polymerization to gelation or precipitation, and thus to better understand the species that affect these properties an… more
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Date: August 2003
Creator: Dong, Hanjiang
Item Type: Refine your search to only Thesis or Dissertation
open access

Structure property and deformation analysis of polypropylene montmorillonite nanocomposites.

Description: Nanocomposites with expandable smectites such as montmorillonite layered silicates (MLS) in polymer matrices have attracted extensive application interest. Numerous MLS concentrations have been used with no particular justification. Here, we investigate the effects of MLS dispersion within the matrix and on mechanical performance. The latter is resolved through a three-prong investigation on rate dependent tensile results, time dependent creep results and the influence of a sharp notch in polyp… more
Date: May 2003
Creator: Hernandez-Luna, Alejandro
Item Type: Refine your search to only Thesis or Dissertation
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