Search for: polyethylene-terephthalate
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    Phase morphology of polyblends of amorphous polycarbonate and semi-crystalline polyethylene terephthalate

    , Article Iranian Polymer Journal (English Edition) ; Volume 11, Issue 3 , 2002 , Pages 151-157+209 ; 10261265 (ISSN) Frounchi, M ; Mehrabzadeh, M ; Mohseni, S. S ; Sharif University of Technology
    Phase morphology, state of compatibility and various properties of blends of polycarbonate (PC) with bottle-grade and fibre-grade polyethylene terephthalate (BPET and FPET, respectively) were investigated. It was found that these blends have two-phase separated morphology with partial miscibility. Scanning electron micrographs revealed separated domains of PC-rich and PET-rich zones. PC domains appear spherical increasing in size from 2 μm for PC20/FPET80 up to about 5 μm for PC60/FPET40 blend. Further increase in PC content up to 80% caused phase inversion in which FPET appears as finely dispersed domains in continuous PC matrix. Tg of PC-rich phase decreased from 153 deg;C for pure PC down... 

    Study of Mechanical Properties of PP/r-PET Composite Reinforced with Flax Fiber

    , M.Sc. Thesis Sharif University of Technology Yosefinezhad, Mehdi (Author) ; Shojaei, Akbar (Supervisor) ; Bagheri, Reza (Supervisor)
    Recycling of polymers, with the aim of environmental protection and economical benefits, is important procedure, which is constantly developing. In this study the effect of the incorporation of recycled PET(r-PET) and recycled polypropylene/Flax(r-PP/Flax) to PP at low (20wt %) and medium content (40wt %) of r-PET was investigated. Polymer compounds were prepared by twin screw extruder followed by injection moulding. The effect of r-PP/Flax and r-PET on PP was evaluated using different techniques such as scanning electron microscopy (SEM), differential scanning calorimetery (DSC), rheological behavior, and mechanical properties (tensile modulus, yield strength, and charpy notched impact... 

    Fabrication and Study of Mechanical Behavior of in Situ Microfibrillar- Reinforced Composites of Polypropylene/Recycled Poly (Ethylene Terephthalate)Toughened with Rubber Particles

    , M.Sc. Thesis Sharif University of Technology Motahari, Tayebeh (Author) ; Bagheri, Reza (Supervisor) ; Alizadeh, Reza (Supervisor)
    The use of polymers is increasing day by day due to low density, reasonable price and ability to produce different products. On the other hand, the accumulation of polymer wastes in nature is one of the environmental concerns in today's world, which is mainly due to the widespread use of polymers in the packaging industry and disposable applications. In order to solve this problem, recycling is recommended as the most appropriate and economical solution. Because in addition to consuming polymer waste, it also saves energy and reduces carbon footprint.Polyethylene terephthalate (PET) is one of the polymeric materials which; It has a special place in the packaging industry and is widely used... 

    Thermodynamic and Kinetic Study for Production of Micro and Nano Poly(Ethylene Terephthalate) Particles With Supercritical System

    , M.Sc. Thesis Sharif University of Technology Oghazian, Farhad (Author) ; Goodarznia, Iraj (Supervisor)
    It is well known that poly(ethylene terephthalate) (PET) is a high melting compound which has exceptional value as a fiber and film-making material, and which currently dominates the whole field of linear polyester substances. However, the high viscosity and limited solubility in liquid solvents restrict its processing to powders and hence the range of applications of such a polymer. Traditionally, crushing, mechanical grinding, ball milling and precipitation from solution are methods for producing powders. The first three ones inevitably change the property of materials. The last one is carried out on the basis of the application of an anti-solvent to decrease the solubility of a... 

    Improvement of Physical and Mechanical Properties of Poly (Ethylene Terephthalate) (PET) by Incorporating Metal-organic Framework (MOF) Nanoparticles

    , M.Sc. Thesis Sharif University of Technology Samieifakhr, Mohammad (Author) ; Shojaei, Akbar (Supervisor) ; Molavi, Hossein (Co-Supervisor)
    Over the past decade, MOFs have been extensively studied due to their very high specific surface area and porous structure. Among a wide range of MOFs, UiO-66 has produced widespread attention for its excellent solvent resistance and high thermal stability. This nanoparticle is formed by 12 coordinates between Zr6O4(OH)4 unit and terephthalic acid ligand, and it seems that the similarity of its organic ligand with one of the PET-forming monomers makes them highly compatible. In this study, for the first time, the role of UiO-66 nanoparticles in improving the amount and rate of crystallization and mechanical and rheological properties of PET was investigated using the melt mixing method. For... 

    Electrospun polyethylene terephthalate/graphene nanocomposite as a new solid-phase microextraction fiber coating for enhanced determination of organochlorine compounds

    , Article Chromatographia ; Volume 81, Issue 10 , 2018 , Pages 1413-1420 ; 00095893 (ISSN) Najarzadegan, H ; Roostaie, A ; Ehteshami, S ; Sharif University of Technology
    Friedr. Vieweg und Sohn Verlags GmbH  2018
    A new unbreakable solid-phase microextraction fiber coating based on polyethylene terephthalate/graphene nanocomposite was developed. The nanocomposite coatings were prepared by an electrospinning technique using a polyethylene terephthalate (PET) polymer solution containing the dispersed graphene on the outer surface of a stainless-steel rod. The applicability of polyethylene terephthalate/graphene nanocomposite coatings was examined by extraction of organochlorine compounds (OCs) including heptachlor epoxide, aldrin, γ-HCH, and β-HCH from aqueous samples in headspace mode. Influential parameters on extraction efficiency such as polymer concentration, the weight ratio of components, the... 

    Evaluation of compressive and split tensile strength of slag based aluminosilicate geopolymer reinforced by waste polymeric materials using Taguchi method

    , Article Materials Research Express ; Volume 8, Issue 2 , February , 2021 ; 20531591 (ISSN) Khezrloo, A ; Tayebi, M ; Shafiee, A ; Aghaie, A ; Sharif University of Technology
    IOP Publishing Ltd  2021
    In this work, slag based aluminosilicate geopolymer was reinforced with polymeric fibers including, polyester (PES) (waste tire cap plies), polymeric particles including polyethylene terephthalate (PET) (waste water bottle), styrene-butadiene rubber (SBR) (waste tire), and polyvinyl chloride (PVC) (waste water hose). The tensile and compressive strength of the material was evaluated. Taguchi method was employed to assess the influence of the effective parameters on the mechanical characteristics of the geopolymer composite. QUALITEK-4 software was used to create the L32 orthogonal array with 192 (96+96) geopolymer specimens and 32+32 experiments. Analysis of variance (ANOVA) was utilized to... 

    Roles of inorganic oxide nanoparticles on extraction efficiency of electrospun polyethylene terephthalate nanocomposite as an unbreakable fiber coating

    , Article Journal of Chromatography A ; Volume 1375 , 2015 , Pages 8-16 ; 00219673 (ISSN) Bagheri, H ; Roostaie, A ; Sharif University of Technology
    Elsevier  2015
    In the present work, the roles of inorganic oxide nanoparticles on the extraction efficiency of polyethylene terephthalate-based nanocomposites were extensively studied. Four fiber coatings based on polyethylene terephthalate nanocomposites containing different types of nanoparticles along with a pristine polyethylene terephthalate polymer were conveniently electrospun on stainless steel wires. The applicability of new fiber coatings were examined by headspace-solid phase microextraction of some environmentally important volatile organic compound such as benzene, toluene, ethylbenzene and xylene (BTEX), as model compounds, from aqueous samples. Subsequently, the extracted analytes were... 

    An Investigation into Effects of Components Ratio and Nano/micro Sized ZnO Particles on Evolution of Transesterification Reaction, Compatiblization and Modification of PET/PC Blends Structure

    , M.Sc. Thesis Sharif University of Technology Ghahramanzadeh Asl, Hadi (Author) ; Bagheri, Reza (Supervisor) ; Pircheraghi, Gholamreza (Supervisor)
    Polycarbonate (PC) and polyethylene-terephthalate (PET) are important engineering thermoplastics. During last decades these polymers and their blends have been studied extensively due to their wide range of applications. Blends of PET and PC combine mechanical properties and chemical resistance together, which make applicable in various components such as automotive, electrical and of medical parts. It has been accepted that PET/PC immiscible blends are subjected to transesterification reactions during thermal processing, which produces PET-PC copolymer chains. In fact, scissioning and substitution of ester/carbonate functional groups of PC and PET at the interface, transforms the initial... 

    Modeling and Control of Polyethylene Terephthalate Production Reactor

    , M.Sc. Thesis Sharif University of Technology Hedayatnasab, Negin (Author) ; Shahrokhi, Mohammad (Supervisor)
    Polyethylene terephthalate (PET) is known as the most important polyester in the world. This polymer is the raw material for synthetic fibers, films and plastic objects and widely used in textiles and food industry. In this project transesterification and polycondensation reactors of a semi-batch process with dimethyl terephthalate/ethylene glycol feedare simulated. First simulations areperformed for reactors in the laboratory scale.Then the reactors are scaled up to industrial scale in order to produce 100 tons per year of PET product. The optimal temperature trajectory for the fisrt reactor is obtained based on a performance index. This performance index includes the reaction time and... 

    Mechanical Behavior of Recycled Polyethylene Terephthalate/Polycarbonate/Glass Fiber Composites

    , M.Sc. Thesis Sharif University of Technology Haji Rezaei, Mohammad Javad (Author) ; Bagheri, Reza (Supervisor)
    Nowadays, with the increasing number of polyethylene terephthalate wastes, the issue of its recycling has become very important. Among the problems of polyethylene terephthalate recycling are its loss of crystallinity and mechanical properties. Recycled polyethylene terephthalate does not have the properties of new polyethylene terephthalate and using its mixture with other materials is an effective way to remove its waste from nature and return it to the production cycle. The aim of this study is to produce a mixture of recycled polyethylene terephthalate with polycarbonate and glass fibers with mechanical properties such as good impact strength, which ultimately leads to the production of... 

    Binary and ternary blends of high-density polyethylene with poly(ethylene terephthalate) and polystyrene based on recycled materials

    , Article Polymers for Advanced Technologies ; Volume 22, Issue 5 , 2011 , Pages 690-702 ; 10427147 (ISSN) Razavi, S ; Shojaei, A ; Bagheri, R ; Sharif University of Technology
    Binary blends of recycled high-density polyethylene (R-HDPE) with poly(ethylene terephthalate) (R-PET) and recycled polystyrene (R-PS), as well as the ternary blends, i.e. R-HDPE/R-PET/R-PS, with varying amounts of the constituents were prepared by twin screw extruder. The mechanical, rheological, thermal, and scanning electron microscopy (SEM) analyses were utilized to characterize the samples. The results revealed that both R-HDPE/R-PET and R-HDPE/R-PS blends show phase inversion but at different compositions. The R-PET was found to have much higher influence on the properties enhancement of the R-HDPE compared to R-PS, but at the phase inverted situation, a significant loss in the tensile... 

    Effects of cylindrical and sheet types of nanoparticles on thermal properties and chain folding free energy of poly(ethylene terephthalate)

    , Article Journal of Reinforced Plastics and Composites ; Volume 32, Issue 11 , 2013 , Pages 846-859 ; 07316844 (ISSN) Goodarzi, V ; Shadakhtar, A ; Sirousazar, M ; Mortazavi, M ; Ghaniyari Benis, S ; Sharif University of Technology
    Poly(ethylene terephthalate) (PET) nanocomposites were prepared through a solution casting method using Multi wall carbon nanotubes (MWCNT) and organically modified montmorillonite (OMMT) as nanoparticles and their morphological and thermal properties investigated. The X-ray diffraction and transmission electron microscopy measurements showed that decreasing the ratio of MWCNT to OMMT for the same amount of OMMT creates better conditions for intercalation of PET macromolecules and promotes the transformation of OMMT nanostructures from the intercalated to exfoliated state. It was concluded that the Ozawa's model was not suitable to interpret the crystallization behavior of the... 

    Oxygen barrier properties of poly(ethylene terephthalate) nanocomposite films

    , Article Macromolecular Materials and Engineering ; Volume 294, Issue 1 , 2009 , Pages 68-74 ; 14387492 (ISSN) Frounchi, M ; Dourbash, A ; Sharif University of Technology
    Nanocomposites of poly(ethylene terephthalate) and two different montmorillonite-based organoclays were prepared by a co-rotating twin screw extruder. Dispersion of nanoclays in the polymer matrix was examined by TEM and XRD. Nanocomposites with lower content of organoclay showed exfoliated morphology while by increasing the amount of organoclay the intercalated morphology was more prevalent. Both organoclays had a good intercalation with PET and were uniformly dispersed within the polymer. Oxygen permeability of thin films of nanocomposites showed that the nanocompo-sites had better oxygen barrier properties than the neat PET. Tensile and impact properties of the nanocomposites also were... 

    Nanotechnology-assisted microfluidic systems: From bench to bedside

    , Article Nanomedicine ; Volume 16, Issue 3 , 2021 , Pages 237-258 ; 17435889 (ISSN) Rabiee, N ; Ahmadi, S ; Fatahi, Y ; Rabiee, M ; Bagherzadeh, M ; Dinarvand, R ; Bagheri, B ; Zarrintaj, P ; Saeb, M. R ; Webster, T. J ; Sharif University of Technology
    Future Medicine Ltd  2021
    With significant advancements in research technologies, and an increasing global population, microfluidic and nanofluidic systems (such as point-of-care, lab-on-a-chip, organ-on-a-chip, etc) have started to revolutionize medicine. Devices that combine micron and nanotechnologies have increased sensitivity, precision and versatility for numerous medical applications. However, while there has been extensive research on microfluidic and nanofluidic systems, very few have experienced wide-spread commercialization which is puzzling and deserves our collective attention. For the above reasons, in this article, we review research advances that combine micro and nanotechnologies to create the next...