Preparation and characterization of polypropylene-compatibilizer-filler composites

Huang, H 2009, Preparation and characterization of polypropylene-compatibilizer-filler composites, Masters by Research, Applied Sciences, RMIT University.


Document type: Thesis
Collection: Theses

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Title Preparation and characterization of polypropylene-compatibilizer-filler composites
Author(s) Huang, H
Year 2009
Abstract Polypropylene (PP) composites includ a mineral filler, though they can be enhanced by blending with an elastomer. Blending rigid fillers with PP increased strength while decreasing toughness. Blending soft elastomers with PP decreased strength while increasing toughness. PP-elastomer-filler ternary composites offer synergism because the increase of strength due to filler may compensate the loss of strength due to the elastomer. Two morphologies were identified, separated elastomer and filler particles in PP, and filler particles encapsulated by elastomer in PP. Interaction between filler and PP matrix are proposed to increase with the addition of polar elastomers when encapsulated morphology is formed, leading to enhanced mechanical properties. PP-elastomer-filler blended tapes were prepared via single-screw extrusion. Annealing was performed after cooling the tapes, and this co mbination proved to increase the modulus. Characterization of the composites was carried out using thermogravimetry, dynamic-force thermomechanometry, modulated-force thermomechanometry, and Fourier transform infrared imaging. Incorporation of polysiloxane elastomer increased the mobility of PP during extrusion. Elongation at break increased with increasing polysiloxane content, while the tensile modulus was slightly decreased. The silica core within the polysiloxane particles provided an additional strength enhancement. Polar elastomers aided binding between PP and fillers, while enhancing strength and toughness. Glass transition temperature and segmental motion activation energy was shifted to higher temperature with addition of elastomer and filler, including kaolin and talc.
Degree Masters by Research
Institution RMIT University
School, Department or Centre Applied Sciences
Keyword(s) Polymer
Composite
Elastomer
Thermal stability
Toughness
Strength
Polypropylene
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