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In‐line turbidity monitoring of the second phase droplets deformation during extrusion
Author(s) -
Zborowski L.,
Canevarolo S.V.
Publication year - 2013
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.23490
Subject(s) - materials science , extrusion , breakup , plastics extrusion , composite material , polypropylene , coalescence (physics) , viscosity , polymer , extrusion moulding , mechanics , physics , astrobiology
The dispersion and deformation of the second phase during extrusion of polymer mixtures were in real‐time characterized using an in‐line turbidimeter. Three polymer mixtures with constant concentration but very different viscosity ratios (1/4, 1, and 4) were reprocessed up to three times in a twin‐screw extruder. After that they were processed again, having the extruder exit being blocked by an on/off valve, which controls the hold‐on and discharge. The melt turbidity, a variable dependent of the droplets size and shape, was recorded during processing and controlled die‐head pressure discharge. The deformation of the droplets is high and reversible in mixture having viscosity ratio close to 1, indicating no droplet breakup and/or coalescence. In contrast, for high viscosity ratios and high matrix elasticity a hysteresis is formed during deformation/recovery of the droplets. POLYM. ENG. SCI., 53:2422–2428, 2013. © 2013 Society of Plastics Engineers