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.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/3/12608306/index.pdf |
| Date | 01 April 2007 |
| Creators | Kurtulus, Ceren |
| Contributors | Bayram, Goknur |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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