Abstract
Polarization IR spectroscopy and differential scanning calorimetry were used to study the effect of temperature upon the orientation and state of tridecanoic acid, crystallized in oriented polymer matrices of PE and PTFE; these were obtained by elongation of polymers in n-propanol—an adsorption-active medium. In polymer micropores tridecanoic acid in the temperature range studied (between 15° and T melt =38–39°) is in the C −-form, which is thermodynamically stable in the conventional state above 34°. In the range below T melt the structure of tridecanoic acid is less ordered, compared with the structure in volumetric crystals. Above T melt the state of tridecanoic acid in PE and PTFE matrices, on the other hand, is of higher order than in a free melt at the same temperature. Melting of tridecanoic acid in micropores of polymer matrices studied takes place in a much wider temperature range than for its macrocrystals.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call