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Polymer crystal formation: On an analysis of the dilute solution lamellar thickness-crystallization temperature data for poly(ethylene)

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Summary

A detailed analysis of available crystal size-crystallization temperature data for crystallization of poly (ethylene) from dilute solutions indicates that all of the data may be represented by the semi-empirical expression:\(l_{obs} = 2 \sigma _e T_{s^0 } /\Delta h_f \Delta {\rm T}_c + \bar l_c\). For good solvents,T 0 s =110.5 °C, σ e =72.0 erg cm−2, and\(\bar l_c = 59.7 {\AA}\). This semi-empirical expression differs from theoretical expressions,l *=2σ e T s 0h f ΔT c l, only in the magnitude of δl predicted (5–15 Å) relative to the empirical value of\(\bar l_c\). One possible origin of this difference may be a temperature dependence of σ e .

Zusammenfassung

Eine detaillierte Analyse von Daten über die Abhängigkeit der Kristallgröße von der Temperatur in der Kristallisation von Polyäthylen aus verdünnten Lösungen zeigt, daß die Engebnisse wiedergegeben werden können durch die semi-empirische Gleichung:\(l_{obs} = 2 \sigma _e T_{s^0 } /\Delta h_f \Delta {\rm T}_c + \bar l_c\). Für gute Lösungsmittel:T 0 s =110,5 °C, σ e =72.0 erg cm−2 und\(\bar l_c = 59,7 {\AA}\). Diese semi-empirische Beziehung unterscheidet sich von den theoretischen Ausdrücken,l *=2σ e T s 0h f ΔT c l, nur in der Größe des Verhältnisses des vorausgesagten δl (5–15 Å) zu dem empirisch gefundenen Wert von\(\bar l_c\). Die Temperaturabhängigkeit von σ e kann möglicherweise diesem andersartigen Verhältnis zugrunde liegen.

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Miller, R.L. Polymer crystal formation: On an analysis of the dilute solution lamellar thickness-crystallization temperature data for poly(ethylene). Kolloid-Z.u.Z.Polymere 225, 62–69 (1968). https://doi.org/10.1007/BF02111401

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