Papers by Keyword: PET

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Authors: Václav Švorčík, Zdeňka Kolská, Jakub Siegel, Petr Slepička
Abstract: Surface of polyethyleneterephthalate (PET) was modified by plasma discharge and subsequently grafted with dithiol (4,4-bifenyldithiol, BFD)) to create thiol (-SH) groups on polymer surface. This short dithiol is expected to be fixed via one of-SH groups to radicals created by the plasma treatment on the PET surface. Free-SH groups are allowed to interact with Au nanoparticles. Xray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR) and Electrokinetic Analysis (EA, zeta potential) were used for the characterization of surface chemistry of the modified PET. Surface morphology and roughness of the samples were studied by Atomic Force Microscopy (AFM).The results from XPS, FTIR, EA and AFM show that the Au nanoparticles are grafted on modified surface in the case of bifenyldithiol pretreatment. The rigid molecule of biphenyldithiol is bounded via only one-SH group to the modified PET surface and the second one remains free for the consecutive chemical reaction with Au nanoparticle. The gold nanoparticles are distributed relatively homogenously over the polymer surface.
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Authors: Eleni Mangiorou
Abstract: Τhe incidence of and mortality from cancer have been increasing steadily for the past 50 years. Most cancers are not localized when first detected, but early detection is mandatory to improve prognosis. In this article, we performed a comparison of four basic methods of tomographic imaging, Positron emission tomography (PET), the computerized tomography (CT), Magnetic Resonance Imaging (MRI) scanner and the ultrasound scanner (US), in respect to their advantages and disadvantages.
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Authors: Guo Ning Liu, Hua Dong Zhao, Qian Qian Guo, Sheng Gang Ma
Abstract: A commercially available PET thin film material with pure aluminum material deposited on its two surfaces is studied in this work to investigate the relationship between the mechanical behaviors and the structure of this “composite” material with the application of the concepts for the composite mechanics. This kind of structure has excellent anti-corrosion properties and can act as the good functional barrier material. Experimental researches are further carried out here to study the mechanical performance under various loading conditions as well as the influence of loading rates over the structure’s failure behavior, and over its mechanical properties like the yielding strength and the elastic modulus.
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Authors: Chang Lang Chen, Lihrong Chiou, Yu Tung Chang, Weichieh Hsu
Abstract: IMR can print out excellent textures and effects on irregular surfaces. Many products decorated by IMR are protected from water and fading, and these kinds of decorations strongly increase beauty, desirability and value of the objects. Therefore, this research is to investigate the potential use of combining IMR with UV inkjet printing and to compare color variance of IMR between PET coated and uncoated white ink. Study results show that the SIDs of PET with white ink is higher about 0.15 to 0.2 than the PET without white ink. The SIDs of PET without white ink will decrease and the SIDs of the PET with white ink will increase when transferred. The PC of PET without white ink is about 10 to 15 higher than the PET with white ink. After transferred, the Color Gamut became smaller than before. Especially for the PET without white ink, its color differences △E can reach 40. In addition, the color gamut became smaller when transferred.
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Authors: Isabel P.P. Cansado, Paulo A.M. Mourão, Manuela M.L. Ribeiro Carrott, Peter J.M. Carrott
Abstract: A carbon molecular sieve for the purification of a gas mixtures containing O2, N2 and CO2, CH4 was produced from a waste granulated PET by means of a single carbonisation step at 973 K. Activated carbon materials presenting good adsorption capacity and some selectivity for O2/N2 and CO2/CH4 were prepared from granulated PET and cork oak with pore mouth narrowing using CVD from benzene. The diffusion coefficients of O2, N2, CO2 and CH4 in these materials were calculated and are comparable to published values determined on Takeda 3A and on a carbon molecular sieve prepared from PET textile fibres by means of carbonisation and subsequent CVD with benzene. However, the selectivities were not quite as good as those given by Takeda 3A. However, taking into account that this is a first attempt at producing CMS from PET, the results are encouraging, and it is to be expected that further development of the experimental procedure will result in new materials with improved performance.
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Authors: J. Nixon, S. Yan, Gary H. Menary
Abstract: This paper is concerned with understanding the behaviour of Polyethylene Terephthalate (PET) in the injection stretch blow moulding (ISBM) process where it is typically bi-axially stretched to form bottles for the packaging industry. Preforms which have been pre sprayed with a pattern and heated in an oil bath have been stretched and blown in free air using a lab scale ISBM machine whilst being monitored via high speed video. The images have subsequently been analysed using a digital image correlation system (VIC 3D). The results have been used to validate appropriate simulations of the free-blow process using ABAQUS®/Explicit FEA with a suitable viscoelastic material model, along with experimental process data obtained using an instrumented stretch rod.
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Authors: Marcos Antônio Guerra, Jeferson Prado Swerts, Mei Abe Funcia, Maria Gabriela Nogueira Campos
Abstract: This study evaluated the antimicrobial activity of PET-Silver nanocomposite filaments at different concentrations (0, 0.180%, 0.135%, 0.090%, 0.045% and 0.022% w/w) of silver nanoparticles in order to determine the minimum inhibitory concentration and minimum bactericidal concentration of silver incorporated in the PET matrix. The in vitro antibacterial activity was evaluated by the AATCC standard 100: 2012 method, against Staphylococcus aureus ATCC 6538, and Klebsiella pneumonia ATCC 4532. The filaments were tested after one and twenty-one months of preparation to evaluate the effect of time on the antimicrobial activity of the nanocomposites. Moreover, the antimicrobial activity was also evaluated after dyeing the filaments. The silver-free PET filaments have not demonstrated antimicrobial activity and cytotoxicity against human dermal fibroblasts. Nevertheless, excepted for the filament with 0.022% of silver nanoparticles, all PET-Silver nanocomposites reduced more than 99% the colony-forming units (CFU) of Staphylococcus aureus and Klebsiella pneumonia after one and twenty-one months of preparation. This suggests that the MIC of silver nanoparticles incorporated in the PET matrix is lower than 220 ppm (w/w) and the MBC is between 0.022 and 0.045% (w/w). However, after the dyeing process, no antimicrobial activity was observed for any PET-Silver nanocomposite filaments. This may be attributed to the release of silver from the PET matrix during the dyeing process or to the reaction/inactivation of the silver ions by the salts used in this chemical treatment.
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Authors: Ran Wang, Xiao Chun Wang, Yan Qiu Wang
Abstract: A γ-glycidyloxypropyltrimethoxysilane (GPTMS) modified titania hydrosol was prepared. The influence of GPTMS modification on the tatania sol was investigated by dimension dispersion, Zeta potential, FT-IR, and the ultraviolet transmittance of the treated PET fabric. The results show that the Zeta potential of nano-particles increased from 2.1mV to 35.6mV. And there was no obvious difference in dimension dispersion and FT-IR between the tatania gel and the modified-tatania gel. The ultraviolet transmittance of the PET fabric treated the modified-sol and the unmodified-sol also did not show significant shift.
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Authors: Xian Zhou, Ying Xiong, Wang Ping Xiong, Ling Zhu Xiong
Abstract: Experimental data for the human body PET multi-variable, non-linear distribution and other characteristics, the use of fusion partial least squares support vector machine variables effectively extracted from the principal component, reducing the number of variables and the exclusion of noise information to construct a linear regression with the dependent variables model, fitting the model has good accuracy and generalization for PET clinical trials provide effective technical support and research ideas.
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Authors: Rwei Ching Chang, Hsi Ting Hou, Fa Ta Tsai, Pei Sin Jhu
Abstract: Atomic layer deposition (ALD) is utilized to grow high performance aluminum oxide (Al2O3) barrier films on flexible PET substrates, where the effects of precursor pulse time and deposition temperature on the film properties are also studied in this work. Significant differences are observed that the water vapor transmission rate of the PET substrate is largely improved by coating the Al2O3 barrier films. Further observations on the surface roughness, optical transmittance, adhesion, mechanical properties of the deposited films are also conducted. The results show that the Al2O3 film deposited with 10 msec precursor pulse time and 60°C deposition temperature behaves the best performance.
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