Abstract

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 CH3(CH2)nCH3, diols HOC(CH2)nCOH, unbranched aliphatic alcohols CH3(CH2)nCOH, saturated carboxylic acids CH3(CH2)nCOOH, and dicarboxylic acids HOOC(CH2)nCOOH—lose their identity and individual properties and evolve toward polyethylene as the number of repeating–CH2–groups increases.

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