CONTROLLED POLYMERIZATION OF ADSORBED MONOMERS. Technical Progress Report. Page: 4 of 15
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Our results of the past year have some significance in several different
branches of physical science. Each will be mentioned briefly.
ig, In the study of physical adsorption of vapors on solid surfaces we
have published what may well be the first plot of amount adsorbed (q) vs. tem-
perature (T) of the vapor source. This plot is Figure 3 of our publication in
J. Colloid Interface Sci. 30, 312 (1969). and is for furan adsorbed on Graphon. It
is based on work done on this research project several years ago. We are aware
that we may be opening up a new field by indicating the advantages of this type of
plot. We have recalculated experimental data for 15 other combinations of vapors
and adsorbents. The data suggest that d q/dT2 may be zero at the point correspond-
ing to monolayer adsorption. There is some theoretical justification for this. The
subject is obviously worthy of further investigation.
The basic experiment in our laboratories consists of the following steps:
1. With 10-1000 mg. Graphon loaded onto spring or balance, heat the
portion of the vacuum line containing the sample to 2500C. for four hours, mean-
while pumping down the vacuum line at pressures below one micron.
2. Equilibrate the Graphon at room temperature (25-270C).
3. Isolate the vacuum system from the vacuum pump and open a Teflon
stopcock to expose the Graphon to vapors in equilibrium with a liquefied sample of
the adsorbate maintained at a predetermined temperature of the order of -200C.
The quantity of liquid is sufficient so that it does not all evaporate during adsorption.
4. Follow adsorption as a function of time for a period of 1-24 hours.
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Livingston, H.K. CONTROLLED POLYMERIZATION OF ADSORBED MONOMERS. Technical Progress Report., report, January 1, 1969; United States. (digital.library.unt.edu/ark:/67531/metadc1031606/m1/4/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.