A polarized light scattering approach for dispersed phase morphology characterization in simulated polymer blends

An optical detector, assembled at a slit die at the exit of a twin screw extruder was used to quantify in‐line the extrusion of a PP/PA6 immiscible blend. During the extrusion the detector respond according to the changes in concentration and particle size of the polyamide 6 phase. The influence of dispersed phase concentration was evaluated varying its concentration from 0 to 5% (w/w). Reduction in the PA6 particle size was followed adding different amounts of polypropylene grafted with acrylic acid (PP‐g‐AA), which acts as a compatibilizer. The normalized detector signal intensity increases with an increase in PA6 concentration, due to an increase in the number of scattering particles in the medium, and with a decrease in its particle size. Plots of detector signal as a function of particle concentration and size enabled the calculation of the extinction cross sections of the PA6 segregated particles.

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Morphological Parameters of PP/PA6 Blend Measured In‐Line During Extrusion

Pinheiro

Bitencourt

Pessan

et al. 2006

Macromolecular Symposia

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Morphology development during blending of immiscible polymers in screw extruders

Tyagi

Ghosh

2002

Polymer Engineering & Sci

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The present work reports evolution of morphology from initial (presence of striation) to f i n a l (droplet formation) stages in a single-screw extruder. Morphology development during the blending process controls the fmal size of the dispersed phase, which in turn significantly affects the properties of the blends. The experiments were carried out using a 70/30 wt% polypropylene/ethylene vinyl acetate (PP/EVA) blend; samples were collected along the length of the screw, by screw pullout experiment, to analyze the size and size distribution of the dispersed phase present both as striated layers and subsequently as droplets. Average size of the dispersed phase and standard deviation were taken into account to monitor the morphology evolution along the length of the screw. Pre-breakup morphology development was studied by analyzing the sample collected from the feed zone of the extruder in terms of upper and lower layers along the cross section of screw channel. Examination of micrographs revealed the existence of pattern of ordered striations along the length of the melting zone c0ntaim-g striations from average size of 1000 pm down to 50 pm decreasing rapidly along the length of the screw. The breakup process was captured at the start of compression zone where step-up in the shear as well as elongational flow was applied due to decrease in the channel depth along the compression zone. The observed droplet size formed by the breakup of filaments is found to be in accordance with theory. The final droplet size is found to be governed by the emulsification process occuning as a result of stretching, breakup and coalescence in the metering section of the screw and is in the order of 2 pm.

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Polarized light scattering in dielectric layers with rough interfaces

Dogariu

Asakura

1996

Optics Communications

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A polarized light scattering approach for dispersed phase morphology characterization in simulated polymer blends

Cited by 7 publications

References 33 publications

Morphological Parameters of PP/PA6 Blend Measured In‐Line During Extrusion

Morphological Parameters of PP/PA6 Blend Measured In‐Line During Extrusion

Morphology development during blending of immiscible polymers in screw extruders

Polarized light scattering in dielectric layers with rough interfaces

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