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Polymerization Of Blocked Isocyanate Functional Polymer Surfaces And Post-Polymerization Modification By Thiol-Isocyanate Reactions, Chase A. Tretbar
Polymerization Of Blocked Isocyanate Functional Polymer Surfaces And Post-Polymerization Modification By Thiol-Isocyanate Reactions, Chase A. Tretbar
Honors Theses
Direct polymerization of isocyanate-functional monomers has been achieved with controlled radical polymerizations (CRP) for precisely engineered modification platforms with highly reactive side chains. However, despite the success of these strategies, the inherent reactivity of isocyanates still leads to adverse side reactions, such as hydrolysis, that are difficult to suppress. Phenol, lactam, and oxime-based blocking agents have been used to limit the reactivity of isocyanates in applications such as multicomponent urethane coating systems. The reactivity of these blocked isocyanates can be restored by thermal deprotection of the blocking agent to achieve the desired reactions. In this work, we use blocked isocyanate-functional …
Analysis Of The Mechanical Properties Of Dgebf/4,4’-Dds Thermoset Systems As A Function Of Cure Rate, Chase B. Thompson
Analysis Of The Mechanical Properties Of Dgebf/4,4’-Dds Thermoset Systems As A Function Of Cure Rate, Chase B. Thompson
Honors Theses
The relationship between macroscopic mechanical and thermal properties and ramp rate during cure of epoxy-amine systems consisting of the epoxide resin digylcidyl ether of bisphenol F (DGEBF, provided Hexion specialty chemicals) and 4,4-diaminodiphenyl sulfone (4,4-DDS, provided by Atul Sulpho) were probed using Dynamic Mechanical Analysis (DMA), Positron Annihilation Lifetime Spectroscopy (PALS), and compression testing. These systems were cured in a programmable oven; the samples were heated from 35°C to 180°C at ramp rates of 0.5, 1.0, 1.5, 2.0, 2.5, 5.0, 10, and 15°C/min. Even as the ramp rates during the cure of these materials was changed, there was very little …
Biomimetic Adhesive Thiol-Ene Films For Improved Adhesion, Laken L. Kendrick
Biomimetic Adhesive Thiol-Ene Films For Improved Adhesion, Laken L. Kendrick
Honors Theses
Current dental restoration materials fall short in adhesion and often pull away from the surface of the tooth upon curing. This project seeks to design polymers that can adhere to wet, heterogeneous surfaces as potential materials for dental restoration applications. The goal of this project is to mimic the structure and adhesive properties of natural adhesives containing 3,4-dihydroxyphenyl-L-alanine (DOPA). We will synthesize mono- and di-functional DOPA derivatives with catechol functionality and investigate their adhesion compared to their non-catechol-containing alternative through incorporation into a model thiol-ene photopolymerization. Functional group conversion, real time kinetics, and adhesion data will be used to analyze …