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Study on the Phase Morphology Evolution and Properties of Polypropylene and Poly(ethylene-co -1-octene) Blends during Twin-screw Extruder

Author: YeNing
Tutor: XuZuoHua
School: Tianjin University
Course: Materials Science
Keywords: PP / POE blends Fourier transform technique Phase morphology Fractal dimension Mechanical Properties
CLC: TQ320
Type: Master's thesis
Year: 2009
Downloads: 42
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Abstract


Intermeshing co-rotating twin-screw extruder to prepare the proportion of different components and different processing conditions polypropylene / polyethylene -1 - octene (PP / POE) blends, using Fourier transform techniques handled by a scanning electron microscope (SEM) characterization of the phase structure evolution of the image of the PP / POE dispersed phase in the blending process and the merge process, and the thermal and mechanical properties of the blends were studied. Using Fourier transform techniques SEM pattern transformed to the frequency domain within research, the use of the corresponding Fourier pattern analysis parameters (a C2, L 1 and lc) discussed the evolution of component sequences, temperature sequence and speed sequence under phase structure, while seeking score fractal dimension D p and D sp to characterize the degree of phase dispersion. The results show that both intuitive SEM image analysis or study the Fourier transform pattern basically reflects the consistent phase dispersion dynamics process. The PP / POE blend system in a twin-screw extrusion process, the phase structure along the screw extruder axial direction gradually refined, the dispersed particles are dispersed and mixed by the initial melt mixing, the particle size is large and the transition to the mixed uneven fine (In addition to the special conditions), the dispersion becomes uniform. The different components of the PP / POE blend system, with the dispersed phase content increases, the size of dispersed phase increases, the dispersion uniformity decline. Screw speed and blend temperature blends also have some influence with the screw speed and increase the size of dispersed phase of the blend temperature first decreases and then have a tendency to increase the uniformity of the dispersed phase first increase and then some decreased, and there exists an optimum screw speed and blending temperature. Different blend ratio of PP / POE blends the mechanical properties of the test phase morphology development of injection-spline characterized by SEM, DSC study of the thermal properties of the blend, to investigate the mechanical properties of the blend with system phase morphology development, and the PP crystallization behavior of contact. The results show that: POE toughening effect near 20wt% blend makes the tensile capacity of the brittle-ductile transition. SEM image obtained by Fourier transform, the average chord length and the correlation distance presents a tendency to increase with increasing POE content. The relationship the grain spacing parameters and tensile required energy input between the dispersed phase content was opposite trend. The blend PP component content of 50-60wt%, the PP and POE incompatible at PP90wt%, shows a certain degree of compatibility to the PP and POE. The POE adding a certain extent conducive to generate a more perfect crystalline PP.

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