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Functional Polymer Surfaces. Chemical and Life Science Engineering. Kenneth J. Wynne, VCU CLSE, DMR-0207560. Andrew J. Lovinger, NSF Program Director. Water makes it hydrophobic: 2wt% polymer surface modifier confers contraphilic wetting on conventional polyurethane.

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Functional Polymer Surfaces

Chemical and

Life Science

Engineering

Kenneth J. Wynne, VCU CLSE, DMR-0207560

Andrew J. Lovinger, NSF Program Director

Water makes it hydrophobic: 2wt%

polymer surface modifier confers contraphilic

wetting on conventional polyurethane.

• New soft block yields surfaces that switch

reversibly from hydrophilic (dry) to

hydrophobic (wet) states.

• Only 2wt% “blooms” to the surface

(polymer surface modifier), making a

conventional polyurethane surface

contraphilic.

• Mechanism: switched hydrogen bonding for

soft block triads [2 semifluorinated and 1

hydantoin side chains].

• Contraphilic switching may prove useful in

applications such as microfluidic devices for

control of fluid streams.

New soft block

Left: Drop spreads (wets) dry surface.

Right: Drop “beads up” on wet surface.


Slide2 l.jpg

Functional Polymer Surfaces

Chemical and

Life Science

Engineering

Kenneth J. Wynne, VCU CLSE, DMR-0207560

Andrew J. Lovinger, NSF Program Director

Outreach:

• New interactive program with Virginia State

University: lecture planned for 2007.

• Collaborative international training for graduate

students from Kyoto Univ. (Prof. Chujo) and Univ. of

Pisa (Prof. Chiellini and Prof. Galli).

• Collaborative international training in surface science

for undergrads from Koç Univ. (Prof. Yilgor)

• Panel member, October 06, the University of

Richmond “Connect with Your Future”, to help

undergraduate science students explore the diversity

of career options in the sciences.

Education:

• Two Ph.D.’s: Dr. Janelle Uilk

(Phillip Morris) and Dr. Umit Makal

(Novion)

• One post-doctoral: Professor

Tomoko Fujiwara (Boise State U.)

• Two REU undergrads: Mr. Carlos

Williams; Ms. R. Wickham.

• Three Ph.D. graduate students

are being trained: Ms. Pinar Kurt

(4th yr), Ms. Allison Mullins (3rd yr

and Mr. Kennard Brunson (2nd yr).


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