Abstract
The methods of polarized IR-spectroscopy and differential scanning calorimetry were applied in a study of the state of low-molecular weight compounds-tridecanoic and heptadecanoic acids-in oriented polymer matrices of PTFE and PE obtained by stretching of the respective polymers in adsorption-active medium-n-propanol. The studied compounds crystallize epitaxially in the micropores of the polymer matrices. In this process, the axis of the hydrocarbon chain of the low-molecular weight compounds is oriented parallel to the drawing axis of the polymer. The heat of melting ΔH m of tridecanoic acid in the micropores of the polymer matrices is smaller than the corresponding value for this acid in free state, and it decreases strongly with the increasing degree of dispersity of the tridecanoic acid crystallites. A considerable difference of the heats of melting of tridecanoic acid in PTFE and PE matrices was detected.
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