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1 International Journal of Applied Mechanics and Engineering

1 2003

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Rheo-optical characterisation of linear low density polyethylene crystallization under shear

Chaari F., Chaouche M., Benyahia l., Tassin J. F.

International Journal of Applied Mechanics and Engineering

2003

Vol. 8, no spec.

213-218

Metallocene linear low density polyethylene (mLLDPE) crystallization under shear flow at controlled shear rates and above its crystallization temperature was investigated experimentally. The evolution of the material optical properties (turbidity, birefringence and dichroism) was monitored following a temperature jump from the melting point to a final crystallization temperature . These properties are discussed in terms of the evolution of the polymer semi-crystalline microstructure. In light of the optical properties evolution, the crystallization process can be split into three regimes (i) incubation phase in which small (compared to the light wavelength) crystalline nuclei spread over the medium, (ii) isotropic crystallite growth phase and (iii) anisotropic crystallite growth phase.