Abstract
The development and nature of the transcystalline-like superstructure produced by pulling the glass fiber (GF) from the isothermal crystallizing (Tc≈135°C) isotactic polypropylene (PP) melt was studied thermooptically. In the vicinity of the pulled GF α row-nuclei form which induce selective β-nucleation resulting in β-cylindrites. The presence of α row-nuclei was evidenced by selective melting of the β-phase having lower melting temperature than the α. Because of the above change in the crystal modification this phenomenon can not be termed by transcrystallinity. The thermal stability and β-nucleation ability of the primary α row-nuclei depend both on the applied shear stress (i.e. molecular orientation) and pulling temperature (Tpull) under the testing conditions: Tαβ<Tc<Tβα and Tαβ<Tpull<>T βα, where Tαβ and Tβα are the lower and upper threshold temperature of the β-formation, respectively. It was suggested that the observed αβ-bifurcation may be related with epitaxial growth.
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Paper presented on the conference “Microphenomena in Advanced Composites” (28 June–1 July 1992, Herzlia, Israel)
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Varga, J., Karger-Kocsis, J. Direct evidence of row-nucleated cylindritic crystallization in glass fiber-reinforced polypropylene composites. Polymer Bulletin 30, 105–110 (1993). https://doi.org/10.1007/BF00296241
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DOI: https://doi.org/10.1007/BF00296241