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Journal of Plastic Film and Sheeting
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Effect of Coextrusion On Pp/Ldpe Bicomponent Blown Films

Raman Spectroscopy for Real-Time Microstructural Measurements

G. Gururajan

Department of Chemical and Biomolecular Engineering, and Center for Advanced Engineering Fibers and Films, Clemson University, Clemson SC, USA

A.A. Ogale

ogale{at}clemson.edu

The effect of coextrusion on the microstructure of polypropylene (PP) and low-density polyethylene (LDPE) bilayer films was investigated by the use of Raman spectroscopy. The onset crystallization-time difference for PP versus LDPE components is an important parameter that controls the orientation and morphology of the coextruded films. Although the overall molecular orientation of PP and LDPE was not significantly different in multilayer films, single-layer LDPE films displayed some row-nucleation of crystals that was not observed in the LDPE layer in coextruded films. Also, there was a slight decrease of crystalline a-axis orientation for coextruded LDPE layer relative to that obtained for single-layer LDPE films.

Key Words: blown film • coextrusion • crystallization-time difference • LDPE • online Raman spectroscopy • PP.

Journal of Plastic Film and Sheeting, Vol. 23, No. 1, 37-49 (2007)
DOI: 10.1177/8756087907077922
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