Self reinforcement of poly(ethylene terephthalate) and polyyethyklene blends

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2007

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Kurtuluş, Ceren

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In this study, 20/80 (weight %) Poly(ethylene terephthalate) (PET) /High Density Polyethylene (HDPE) Microfibrillar Reinforced Composites (MFC) were prepared by using high density polyethylene (HDPE) as the matrix material, poly(ethylene terephthalate) (PET) as the reinforcing component. Ethylene n-butyl acrylate-glycidyl methacrylate (E-nBA-GMA) and ethylene methyl acrylate (E-MA) as the compatibilizers in 1, 5, and 10 wt. %. The objective of this study is to produce MFCs based on PET and HDPE via extrusion-drawing-injection method and to characterize as extruded, as drawn and injection molded materials in terms of morphologies, and mechanical and thermal properties. In addition, the effect of compatibilizer type and content on properties of PET-HDPE composites was studied. For comparison purposes, conventional PET-HDPE composites with and without compatibilizer were prepared. Also, the effect of screw speed and drawing speed on the morphologies and mechanical and thermal properties were investigated. The effect of low and high injection temperature molding on morphologies were also observed. SEM analyses showed that, extruded blends became oriented after drawing. The fibrillar structure was preserved after injection molding. High injection molding temperature destroyed the structure of PET microfibers. In addition, it was also observed that the adhesion between HDPE and PET improved with the addition of the compatibilizers. Tensile strength and tensile modulus values of PET/HDPE MFCs increased with increasing drawing speed. Increasing the screw speed resulted in a slight decrease in tensile strength values. Addition of the compatibilizers to the system decreased tensile strength and tensile modulus values. Results of impact tests designated that the impact strength of the materials with and without MFC structure increased with the increasing amounts of E-nBAGMA. DSC analyses pointed out that, melting temperatures of HDPE and PET phase did not change significantly with increasing drawing speed or with the addition of the compatibilizer. As the drawing speed increased from 2.7 m/min to 6.2 m/min, degree of crystallinity of the drawn samples of the PET phase increased.

Subject Keywords

Chemical engineering.

URI

http://etd.lib.metu.edu.tr/upload/3/12608306/index.pdf
https://hdl.handle.net/11511/16771

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

C. Kurtuluş, “Self reinforcement of poly(ethylene terephthalate) and polyyethyklene blends,” M.S. - Master of Science, Middle East Technical University, 2007.