Light stability and the effect of temperature on mechanical properties of polypropylene / poly (ethylene-vinyl-acetate) blends

Download

index.pdf

Date

2007

Author

Güçlü, Mehmet

Metadata

Show full item record

Item Usage Stats

248
views

53
downloads

The variation in properties of Polypropylene (PP) / Ethylene Vinyl Acetate (EVA) blends upon EVA content, temperature, and light stability were followed by using tensile testing, impact testing, and differential scanning calorimetry (DSC). Young’s modulus of the blends decreased with increasing drawing temperature and EVA content. The stress at break values of the blends slightly increased with EVA whereas decreased with drawing temperature. The percent strain at break values of the blends were found to increase abruptly by increasing EVA content and drawing temperature. These changes in the mechanical properties are the indication of compatibility. The impact tests were performed only at 0°C, 25°C and the impact strength increased with the temperature and EVA content, but none of the samples were broken at higher testing temperatures. The effect of stabilizer was very obvious because stabilizer-free samples failed after 400 hours whereas, the samples with stabilizer resisted up to 750 hours. Elongation values of the samples decreased because of increasing brittleness by UV irradiation. We also observed chain stiffening effect by crosslinking in all samples upon UV irradiation. Thermal analysis of the blends of the drawn samples showed an increasing trend of crsytallinity with increasing drawing temperature. Increasing drawing temperature made polymer chains more flexible because of the increasing chain mobility. These flexible chains were then oriented in one direction during tensile testing and therefore uniaxial crystallization occurred. The morphology of impact and tensile tests samples were also analyzed by scanning electron microscope (SEM). The fibrillation of pure PP is higher than the fibrillation of the blends.

Subject Keywords

Polymers., Macromolecules.

URI

http://etd.lib.metu.edu.tr/upload/12608535/index.pdf
https://hdl.handle.net/11511/16953

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Effect of polymer additives on the physical properties of bitumen based composites Doğan, Mehmet; Bayramlı, Erdal; Department of Polymer Science and Technology (2006) Polymer modified bitumen is a binder obtained by the incorporation of various types of polymers in bitumen using mechanical mixing or chemical reactions. There are several factors affecting the properties of polymer modified bituminous composites such as; chemical composition of bitumen, kind of polymer and filler, compatibility of bitumen and polymer, amount of bitumen, polymer and filler, particle size of filler and process conditions. The main objective of this study is to determine the effects of polyme...
Effects of injection molding conditions on the mechanical properties of polyamide/glass fiber composites Cansever, Cahit Can; Yılmazer, Ülkü; Department of Polymer Science and Technology (2007) In this study, effect of injection molding process parameters on fiber length and on mechanical properties of Polyamide-6 / glass fiber composite were investigated to produce higher performance composites. Polyamide-6 was first compounded with an E-grade glass fiber in a co-rotating intermeshing twin screw extruder. Then, by using this composite, twenty-five types of experiments were performed by injection molding by changing the barrel temperature, injection pressure, hold pressure, mold temperature, cooli...
Production and characterization of boron containing flame retardant polyamide-6 and polypropylene composites and fibers Doğan, Mehmet; Bayramlı, Erdal; Department of Polymer Science and Technology (2011) The main objective of this study was to produce flame retardant polyamide-6 (PA-6) and polypropylene (PP) composites and fibers containing boron compounds. The synergistic effect on flame retardancy of boron compounds (boron silicon containing oligomer (BSi), zinc borate (ZnB), boron phosphate (BPO4), metal oxide doped BPO4 and lanthanum borate (LaB)) with conventional flame retardants were investigated. The synergistic effect of nano-clay with commercial flame retardants was also investigated in order to r...
Synthesis and characterization of copolymers of diisocyanates and dialcohol Keskin, Selda; Usanmaz, Ali; Department of Polymer Science and Technology (2008) This study was aimed to synthesize low molecular weight hydroxyl terminated polyurethane acrylate polymers that can be used in biomedical applications. Acrylate end capping via inter-esterification reaction was successfully achieved with the methacryloyl chloride addition to the hydroxyl ends of the polyurethane at low temperatures. Isocyanate terminated polyurethane acrylates were also synthesized for the sake of comparison. TDI, HDI and MDI were used as diisocyanates for urethane synthesis and they were e...
Microwave-assisted simultaneous novel synthesis of poly(dibromophenylene oxide)s, poly(diiodophenylene oxide)s (p), conducting(cp) and/or crosslinked (clp) and/or radical ion polymers (rip) Çelik, Güler Bayraklı; Kısakürek, Duygu; Department of Chemistry (2007) Microwave-assisted novel synthesis of poly(dibromophenylene oxide) or poly(diiodophenylene oxide) (P), conducting polymer (CP) and/or crosslinked polymer (CLP) and/or radical ion polymer (RIP) were achieved simultaneously from lithium, sodium or potassium 2,4,6-bromophenolate or sodium 2,4,6-iodophenolate in a very short time interval. Polymerizations were carried out by constant microwave energy with different time intervals varying from 1 to 20 min; or at constant time intervals with variation of microwav...

Citation Formats

M. Güçlü, “Light stability and the effect of temperature on mechanical properties of polypropylene / poly (ethylene-vinyl-acetate) blends,” M.S. - Master of Science, Middle East Technical University, 2007.