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Theses/Dissertations

Chemical engineering

Polymer Chemistry

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Full-Text Articles in Engineering

Synthesis And Characterization Of Stimuli Responsive Block Copolymers, Self-Assembly Behavior And Applications , Michael Duane Determan Jan 2006

Synthesis And Characterization Of Stimuli Responsive Block Copolymers, Self-Assembly Behavior And Applications , Michael Duane Determan

Retrospective Theses and Dissertations

Water-soluble stimuli responsive block copolymers are a rapidly emerging class of materials with great potential in biomedical and technological applications. In this work a novel class of pentablock copolymers are synthesized via atom transfer radical polymerization techniques and their stimuli-responsive self-assembly properties are characterized. Aqueous solutions of these materials are observed to form micelles and hydrogels in response to changes in both temperature and pH. Cryogenic transmission electron microscopy (cryo-TEM) and small angle neutron and X-ray scattering (SANS and SAXS) techniques are used to investigate the nanoscale structures formed by these pentablock copolymers in solution. The gel structure and mechanical ...


Interdiffusion Phenomena At Partially Miscible Polymer Interfaces , Erin Lynne Jablonski Jan 2002

Interdiffusion Phenomena At Partially Miscible Polymer Interfaces , Erin Lynne Jablonski

Retrospective Theses and Dissertations

This research is focused on understanding the effect of miscibility on interdiffusion phenomena in bilayers of polystyrene (PS) and the statistically random copolymer, poly (styrene-r-4-bromostyrene) (PBS). Miscibility in such systems can be quantified by N*chi, where N* is an effective degree of polymerization and chi the Flory-Huggins interaction parameter. In the PS/PBS system, miscibility decreases as N *chi increases. The extent of interdiffusion at a bilayer interface is ultimately determined by the miscibility of the system. A description of the effect of miscibility on interdiffusion phenomena, interfacial width, phase behavior, and fracture energy and a relationship between these ...


The Use Of Polymers From Furfural In The Fabrication Of Molded Products , Richard Wedge Bruins Jan 1934

The Use Of Polymers From Furfural In The Fabrication Of Molded Products , Richard Wedge Bruins

Retrospective Theses and Dissertations

No abstract provided.