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

• Autorzy: Chaari F. , Chaouche M. , Benyahia l. , Tassin J. F.
• Konferencja: Second International Conference on Engineering Rheology ICER 2003
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

flow-induced crystallization; rheo-optics; polyethylene

PL

reologia; polietylen; przepływ

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2003
• Tom: Vol. 8, no spec.
• Strony: 213--218
• Opis fizyczny: Bibliogr. 9 poz., wykr.

Twórcy

autor

Chaari F.

• Laboratoire de Mécanique et Technologie, Ecole Normale Supérieure de Cachan 61 Avenue du Président Wilson, 94235, Cachan, Cedex, FRANCE

autor

Chaouche M.

• Laboratoire de Mécanique et Technologie, Ecole Normale Supérieure de Cachan 61 Avenue du Président Wilson, 94235, Cachan, Cedex, FRANCE

autor

Benyahia l.

• Laboratoire Polymeres, Colloides, Interfaces, Universite du Maine Avenue OHvier Messiaen, 72085, Le Mans, Cedex, FRANCE

autor

Tassin J. F.

• Laboratoire Polymeres, Colloides, Interfaces, Universite du Maine Avenue OHvier Messiaen, 72085, Le Mans, Cedex, FRANCE

Bibliografia

• [1]Blundell D.J., Mahendrasingam A.. Martin C„ Fuller W, MacKerton D H Hanie J.L Oldman R.L and Riekel C. (2000): Orientation prior to crystallisation during drawing of poly(ethylene terephthalate). - Polymer vol.41, No.21, pp.7793-7802.
• [2] Chaari F„ Chaouche M. and Doucet J. (2003): Crystallization of poly under tensile strain: crystalline development versus mechanical behaviour. - Polymer, vol.44, No.2, pp.473-479.
• [3] Floudas G., Hilliou L„ Lellinger D. and Alig I. (2000): Shear-inducer crystallization of poly (s-caprolactone). - 2. Evolution of birefringence and dichroism. - Macromolecules, vol.33, No. 17, pp.64o6-6472.
• [4] Fuller G.G. (1995): Optical Rheometry of Complex Fluids. - New York: Oxford University.
• [5] Le Meins J.-F. and Tassin J.-F. (1999): Optical behavior associating polymer under shear flow. - Journal of Rheology, vol.43, No.6, pp. 1423-1436.
• [6] Mitchell G.R, Holt J.J., Thornley S.A. and Chai C.K. (2001): Crystallization from X ray and neutron scattering studies. - Macromolecular Symposia, special issue: International Conference on Flow Induced Crystallization of Polymers, Salerno Italy, October 14-17, vol.l85, pp.15-18.
• [7] Pople J.A., Mitchell G.R. and Chai C.K. (1996): In-situ time resolving wide angle X ray scattering study of crystallization from sheared polyethylene melts. - Polymer, vol.37, No.18, pp.4187-4191.
• [8] Ryu D.S., Inoue T. and Osaki K. (1998): A birefringence study of polymer crystallization in the process of elongation films. - Polymer, vol.39, No. 12, pp.2515-2520.
• [9] Verboten O. (1997): Crystallization of PolyEthylene Terephthalate in Injection Moulding: Experiments, Modelling and Numerical Simulation. - Ph.D. thesis, Universite Catholique de Louvain.