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Full-Text Articles in Engineering
Double-Network Materials Via Frontal Polymerization & Supercritical Co2 Processing, Matthew Joseph Lampe
Double-Network Materials Via Frontal Polymerization & Supercritical Co2 Processing, Matthew Joseph Lampe
Doctoral Dissertations
This dissertation presents work focused on producing materials in non-equilibrium states by taking advantage of novel processing techniques. First, epoxy-based resins which can undergo radically promoted, cationic, thermal, frontal polymerization are investigated for their potential use as adhesives. These resins are found to be capable of sustaining propagating polymerization fronts between several different substrate materials, resulting in high levels of adhesion in some cases. In addition, a similar frontal resin was developed that can undergo sequential gelation and frontal polymerization. The gels are formed by radically crosslinking acrylate monomers within the epoxy resin. These gels can then be manipulated, and …
Evaluating Effects Of Molecular Heterogeneity On The Non-Linear Mechanical Behavior Of Epoxy Networks, Zhan Hang Yang
Evaluating Effects Of Molecular Heterogeneity On The Non-Linear Mechanical Behavior Of Epoxy Networks, Zhan Hang Yang
Doctoral Dissertations
This thesis describes synthetic and processing strategies to formulate epoxies resins with molecular heterogeneity to achieve enhanced engineering properties. The network heterogeneities include chemical differences in stiffness and crosslink density, as well as mechanical difference in baseline energy state. The focus is to understand the fundamental structure-process-property relationships in these unusual network polymers, especially the post-yield responses and fracture toughness. The main characterization techniques to probe the complex network architectures are dynamic mechanical spectroscopy and compression tests. Ductility and governing parameters are also proposed to describe the relationships between molecular structures and physical properties. Three different staged fabrication strategies are …