Synthesis and Study of Engineered Heterogenous Polymer Gels Page: 1
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Yuanye Chen, Synthesis and study of engineered heterogenous polymer gels
Doctor of Philosophy (Physics), August, 1998, 121 pp., 44 illustrations, bibliography,
110 titles.
This dissertation studies physical properties and technological applications of
engineered heterogenous polymer gels. Such gels are synthesized based on modulation of
gel chemical nature in space.
Shape memory gels have been developed in this study using the modulated gel
technology. At room temperature, they form a straight line. As the temperature is
increased, they spontaneously bend or curl into a predetermined shape such as a letter of the
alphabet, a numeral, a spiral, a square, or a fish. The shape changes are reversible.
Heterogenous structures have been also obtained on the gel surface. The central idea
is to cover a dehydrated gel surface with a patterned mask, then to sputter-deposit a gold
film onto it. After removing the mask, a gold pattern is left on the gel surface. Periodical
surface array can serve as gratings to diffract light. The grating constant can be
continuously changed by the external environmental stimuli such as temperature and
electric field. Several applications of gels with periodic surface arrays as sensors for
measuring gel swelling ratio, internal strain under a uniaxial stress, and shear modulus
have been demonstrated.
Porous NIPA gels have been synthesized by a suspension technique.
Microstructures of newly synthesized gels are characterized by both SEM and a capillary
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Chen, Yuanye. Synthesis and Study of Engineered Heterogenous Polymer Gels, dissertation, August 1998; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc278503/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .