Общность термодинамических свойств кристаллов нормальных длинноцепочечных алифатических соединений и полиметилена

We analyze the dependency of melting points of molecular crystals with different chain lengths on the crystal habit of elementary volume for the first-order phase transition. We demonstrate that molecular crystals with identical chemical structure of their cores—unbranched alkanes CH_3(CH_2)_ n CH_3, diols HOC(CH_2)_ n COH, unbranched aliphatic alcohols CH_3(CH_2)_ n COH, saturated carboxylic acids CH_3(CH_2)_ n COOH, and dicarboxylic acids HOOC(CH_2) n COOH—lose their identity and individual properties and evolve toward polyethylene as the number of repeating–CH_2–groups increases.