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Broad Impacts:

Monodisperse, Thermoresponsive Microgels Based on Poly(ethylene Glycol) Derivative Polymers Zhibing Hu, University of North Texas, DMR 0805089. The objective of this proposed project is to create new thermo-responsive polymer colloids based on poly(ethylene glycol) derivative polymers.

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Broad Impacts:

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  1. Monodisperse, Thermoresponsive Microgels Based on Poly(ethylene Glycol) Derivative PolymersZhibing Hu, University of North Texas, DMR 0805089 • The objective of this proposed project is to create new thermo-responsive polymer colloids based on poly(ethylene glycol) derivative polymers. • Here we show that the microgels based on polyethylene glycol (PEG) derivative polymers have been successfully used as building blocks for preparation of photonic hydrogels (Figures on right). These hydrophilic particles not only have thermal responsive behavior like PNIPAM particles but also can self-assemble into crystalline structures like PS, silica or PNIPAM particles. Hydrogels are well known for their hydrophilic and environmentally responsive properties. Constructing photonic hydrogels with nontoxic, thermally responsive PEG derivative polymers could open a door for new applications. • Macromolecules (Communication to the Editor), 41, 9508–9512 (2008) A photonic hydrogel that PEG derivative microgels were used as crosslinkers to connect PEGA polymer chains. The gel color changes with temperatures at: a) 22, b) 24, c) 30, d) 34, e) 40, and f) 50 oC.

  2. Monodisperse, Thermoresponsive Microgels Based on Poly(ethylene Glycol) Derivative PolymersZhibing Hu, University of North Texas, DMR 0805089 Broad Impacts: UNT will invest $25 million over a five-year period to further faculty research on high profile issues affecting society by supporting six multidisciplinary research collaborations, or clusters. Results from this project have contributed to the formation of the Bio/Nano photonics cluster, one of the fortunate six at UNT, composed of 14 faculty members from Chemistry, Physics, Biology, Materials Science and Engineering and UNT Health Center at Fort Worth. Several collaborative projects have already been carried out including incorporating metal complex into microgels. Jun Zhou has been awarded the University of North Texas Graduate School Dissertation Scholarship. He successfully defended his Ph.D. dissertation , entitled” Stimuli-responsive microgels for self-assembled crystalline structures and controlled drug release”, in June 2009. Josh Wahrmund has been awarded the Arts and Science College Graduate Research Fellowship (CGRF). He is working on  a theoretical model of swelling kinetics of a thermo-responsive gel shell.

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