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Heterogeneous nucleation and crystallization of polyethylene with gold: Dilatometry

✍ Scribed by Katsuyuki Hara; Harold Schonhorn

Publisher
John Wiley and Sons
Year
1972
Tongue
English
Weight
923 KB
Volume
16
Category
Article
ISSN
0021-8995

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✦ Synopsis

Heterogeneous nucleation and crystallization data for polyethylene a t a gold interface are reported. Isothermal crystallization is investigated by dilatometry. Avrami plots of the crystallization data suggest that the gold surface acts as a suitable nucleating agent resulting in heterogeneous nucleation and two-dimensional crystal growth a t the polyethylene melt-gold interface. The deviation of measurements from Avrami's equation suggests the presence of intercrystalline links during the final growth stages of isothermal crystallization. A closely packed lamellar model is given for heterogeneous nucleation and two-dimensional crystallization which results in high density and rodlike crystals.

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The effect of cooling, nucleation, and spherulitic growth rates on the properties of polypropylene is discussed briefly. A differential thermal analysis technique is described for evaluating the relative extent of heterogeneous nucleation that occurs in a particular polypropylene composition. The me