Annealing of polystyrene fibrillar crystals

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Abstract
The melting behavior of as-prepared and annealed polystyrene fibrillar crystals was studied by differential scanning calorimetry. For the original sample the breadth of the melting peak and its extension above the equilibrium melting temperature indicate that there is a pronounced superheating effect which is probably due to the extended-chain backbone of the crystals. On annealing at temperatures below the onset of melting of the original sample, an additional melting peak was produced. This peak has been interpreted as being due to secondary crystallization of molecular inhomogeneities during annealing. Samples annealed at temperatures near to the original melting peak temperature showed partial melting and recrystallization to form more perfect crystals. The influence of premelting on the subsequent crystallization and melting was studied, and the role of resistant nuclei, especially from the extended-chain backbone threads, is discussed.

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