la300634v_si_001.pdf (205 kB)
Diblock-Copolymer-Coated Water- and Oil-Repellent Cotton Fabrics
journal contribution
posted on 2012-05-01, 00:00 authored by Dean Xiong, Guojun Liu, E. J.
Scott DuncanA diblock copolymer consisting of a sol–gel-forming
block
and a fluorinated block was used to coat cotton fabrics, yielding
textiles that were highly oil- and water-repellent. The coating procedure
was simple. At grafted polymer amounts of as low as 1.0 wt %, water,
diodomethane, hexadecane, cooking oil, and pump oil all had contact
angles surpassing 150° on the coated cotton fabrics and were
readily rolled. The liquids were not drawn into the interfiber space
by the coated fabrics. Rather, droplets of the nonvolatile liquids
such as cooking oil retained their beaded shapes for months with minimal
contact angle changes. When forced into water, the coated fabrics
trapped an air or plastron layer and this plastron layer was stable
for months. In addition, the coating had high stability against simulated
washing, and the mechanical properties were essentially identical
to those of uncoated cotton fabrics.