The Role of Oxygen in Solid State Polymerization. [Part] 1. Acrylamide and Its Solid Solutions Page: 10 of 27
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DISCUSSION
It is well to begin by giving a description of the crystal
structure involved just adequate enough for our purposes. The
details will be published elsewhere. (10)
Figure 8a and b shows a model of the acrylamide structure.
Only the carbon, nitrogen and oxygen are shown. The h ol projec-
tion is shown in a, whereas b is a view looking along the c axis.
In spite of the supporting wires in the model, it-is obvious that
the crystal has a layer structure. Each layer is held together by
hydrogen bonding and then the layers are stacked upon one another.
The amide groups form the.core of each layer and the hydrocarbon
end groups the outside. The structure of propionamide is very
similar, the chief difference, neglecting the additional hydrogens,
being an approximately 11% increase in the interlayer distance.
The free radical in both acrylamide and propionamide has been
shownto b CH3- = ONH2(4),
shown to be CH3 - - CONH2. The free radical function is,
therefore, on the outer hydrocarbon part of the layer and accessible
to small molecules capable of diffusing between layers. Indeed,
the free radical in acrylamide is formed by the diffusion of radio-
lytic hydrogen between layers. In the presence of air the free rad-
ical signal of acrylamide shows no marked change,(11) or, at most,
a very slow decay. The case of propionamide is markedly different
though the crystal structure is very similar. The above results
(Figures 6 and 7) show a very dramatic increase in decay rates when
air is admitted. The significant difference seems to be the increased
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Adler, G. The Role of Oxygen in Solid State Polymerization. [Part] 1. Acrylamide and Its Solid Solutions, report, May 18, 1965; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1029631/m1/10/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.