Self reinforcement of poly(ethylene terephthalate) and polyyethyklene blends

Kurtuluş, Ceren
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.


Catalytic partial oxidation of propylene on metal surfaces by means of quantum chemical methods
Kızılkaya, Ali Can; Önal, Işık; Department of Chemical Engineering (2010)
Direct, gas phase propylene epoxidation reactions are carried out on model slabs representing Ru-Cu(111) bimetallic and Cu(111) metallic catalyst surfaces with periodic Density Functional Theory (DFT) calculations. Ru-Cu(111) surface is modelled as a Cu(111) monolayer totally covering the surface of Ru(0001) surface underneath. The catalytic activity is evaluated following the generally accepted oxametallacycle mechanism. It is shown that the Ru-Cu(111) surface has a lower energy barrier (0.48 eV) for the s...
Production and characterization of polypropylene/organoclay nanocomposites
Yayla, Saniye; Yılmazer, Ülkü; Department of Chemical Engineering (2007)
Polypropylene, PP, based nanocomposites were produced via melt blending method by using twin-screw extrusion in this study. The effects of organoclay type, compatibilizer type, and mixing order of components on the morphology, thermal, mechanical and flow properties of ternary nanocomposites were investigated. Terpolymer of ethylene/butyl acrylate/maleic anhydride, ethylene/methyl acrylate/glycidyl methacrylate, and copolymer of ethylene/glycidyl methacrylate elastomers were used as compatibilizer, whereas ...
Synthesis and Characterization of Aluminum Containing Silica Aerogel Catalysts for Degradation of PLA
Sivri, Seda; Dilek Hacıhabiboğlu, Çerağ; Sezgi, Naime Aslı (Walter de Gruyter GmbH, 2019-05-01)
Aluminum loaded silica aerogel based catalysts were synthesized by impregnation of aluminum into silica aerogel produced using sol-gel method in different aluminum loadings (2.5-15 wt%) to investigate their performances in degradation of polylactic acid (PLA).
Quantum chemical simulation of nitric oxide reduction by ammonia (scr reaction) on v2o5 / tio2 catalyst surface
Soyer, Sezen; Önal, Işıl; Department of Chemical Engineering (2005)
The reaction mechanism for the selective catalytic reduction (SCR) of nitric oxide by ammonia on (010) V2O5 surface represented by a V2O9H8 cluster was simulated by density functional theory (DFT) calculations. The computations indicated that SCR reaction consisted of three main parts. In the first part ammonia activation on Brønsted acidic V-OH site as NH4+ species by a nonactivated process takes place. The second part includes the interaction of NO with pre-adsorbed NH4 + species to eventually form nitros...
Electrospinning of polystyrene/butly rubber blends : a parametric study
Göktaş, Ahmet; Gündüz, Güngör; Department of Chemical Engineering (2008)
Nanofibers, which have high surface area to volume ratio and better mechanical properties, are nanomaterials that both industry and scientists have started to show great attention in the last two decades. They are used in many areas such as life and filtration sciences, sensors, and composite reinforcement etc. Among five main production types, electrospinning is the best candidate for further development with a wide range of opportunities to be applied to all types of polymers and ceramics. This method use...
Citation Formats
C. Kurtuluş, “Self reinforcement of poly(ethylene terephthalate) and polyyethyklene blends,” M.S. - Master of Science, Middle East Technical University, 2007.