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Polypropylene nucleation on a glass fibre after melt shearing

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Abstract

Thermoplastic composites may exhibit a wide range of crystalline morphologies in the neighbourhood of fibres. It was found that glass fibre shearing of a molten polypropylene at high temperature modifies the subsequent isothermal crystallization (T c=122°C) under static conditions. The crystallization results have been analysed as a function of the previous high temperature, shear, γ, shear rate,\(\dot \gamma \), and shear stress, τ. The mechanical parameters at high temperature, γ,\(\dot \gamma \), τ, have been calculated for two shearing temperatures (T=170, 210°C) and two fibre displacements. An α-phase nucleation process took place at the fibre surface after shearing at the higher temperature (T=210°C). The nucleation increased with shear but did not appear for static conditions. A strong nucleation process in β phase appeared on the fibre surface after shearing of the polymer at the lower temperature (T=170°C). These strong morphological modifications with shearing temperature have been analysed as a function of mechanical and thermodynamical parameters.

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Monasse, B. Polypropylene nucleation on a glass fibre after melt shearing. J Mater Sci 27, 6047–6052 (1992). https://doi.org/10.1007/BF01133748

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  • DOI: https://doi.org/10.1007/BF01133748

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