Results 181 to 190 of about 5,891 (210)

Kinetic model for the pyrolysis and combustion of poly-(ethylene terephthalate) (PET)

Journal of Analytical and Applied Pyrolysis, 2001
Abstract The kinetics of the global primary thermal decomposition of poly-(ethylene terephthalate) (PET) waste was studied in strict pyrolysis conditions and with different proportions of oxygen by TGA, between temperatures of 25 and 800°C. Prior to the decomposition, the polymer first melts at around 250°C.
I. Martı́n-Gullón, M. Esperanza, R. Font   +2 more
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How to Make Colorless Poly(ethylene terephthalate)(PET)

International Journal of Polymeric Materials, 2001
Abstract The methods and flow charts used for the industrial preparation of PET are shown and briefly discussed. Then, the three classes of contaminants usually appearing in PET are described and their causes elucidated. The organic contaminants impart to the produced PET an undesired yellow-amber tinge while those containing metal ions or elemental ...
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Microwave-assisted esterification step of poly(ethylene terephthalate) (PET) synthesis through ethylene glycol and terephthalic acid

Polymer Bulletin, 2018
The esterification step during poly(ethylene terephthalate) (PET) polymerization was studied using ethylene glycol (EG) and terephthalic acid (TPA), together with microwave radiation in a closed system. First, the effects of temperature and molar ratio EG/TPA on the number-average molecular weight (
Ana Christy Espinosa-López, Carlos Alberto Ávila-Orta, Francisco Javier Medellín-Rodríguez, Pablo González-Morones, Carlos Alberto Gallardo-Vega, Patricia Adriana De León-Martínez, Maribel Navarro-Rosales, Janett Anaid Valdez-Garza   +7 more
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Characterization and quality assessment of recycled post-consumption poly(ethylene terephthalate) (PET)

Environmental Science and Pollution Research, 2018
In the present study, the recycled post-consumption polyethylene terephthalate (PET) flakes were investigated as possible raw materials for the production of food packaging. After heating at 220 °C for 1 h, a steaming stage was conducted as a control test to assess the quality of the product.
Fatma Masmoudi, Françoise Fenouillot, Afef Mehri, Mohamed Jaziri, Emna Ammar   +4 more
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Alkali resistance of poly(ethylene terephthalate) (PET) and poly(ethylene glycol-co-1,4-cyclohexanedimethanol terephthalate) (PETG) copolyesters: The role of composition

Polymer Degradation and Stability, 2015
The alkali resistance of poly(ethylene terephthalate) (PET) and a series of poly(ethylene glycol-co-1,4-cyclohexanedimethanol terephthalate) (PETG) copolyesters with different molar ratios of ethylene glycol (EG) to 1,4-cyclohexanedimethanol (CHDM) was systematically investigated. Differential scanning calorimetry (DSC) and wide-angle X-ray diffraction
Tingting Chen, Weikai Zhang, Jun Zhang
openaire   +1 more source

Poly(ethylene terephthalate)-PET and Poly(ethylene naphthalate)-PEN

2019
Since its discovery in 1930 by American chemist Wallace Hume Carothers and his coworkers, poly(ethylene terephthalate) (PET) attracted a great deal of attention by academic and industrial researchers. The new synthetic polymer, whose linear structure is built up by terephthalic acid and ethylene glycol units, was soon used for an extremely wide range ...
Sorrentino, Luigi, D' Auria, Marco, Amendola, Eugenio   +5 more
openaire   +1 more source

Morphology and modulus–temperature behavior of semicrystalline poly(ethylene terephthalate) (PET)

Journal of Polymer Science: Polymer Physics Edition, 1976
AbstractThe influence of the thermal history on the morphology and mechanical behavior of PET was studied. The degree of crystallinity (density measurements) and the morphological structure (electron microscopy and small‐angle x‐ray diffraction) depend on the crystallization temperature. The viscoelastic parameters obtained from the modulus–temperature
G. Groeninckx, H. Berghmans, G. Smets
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Structure formation in UV-laser ablated poly-ethylene-terephthalate (PET)

Applied Physics A Solids and Surfaces, 1991
Structure formation observed in UV-laser ablated poly-ethylene-terephthalate (PET) foils can uniquely be assigned to mechanical and thermal pretreatments.
E. Arenholz, V. Svorcik, T. Kefer, J. Heitz, D. B�uerle   +4 more
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Physical aging studies in amorphous poly(ethylene terephthalate) (PET) blends

Thermochimica Acta, 1990
Abstract Physical aging phenomena of amorphous poly(ethylene terephthalate) (PET) blends have been investigated. Blends modified with dioctylphthalate (DOP), a miscible plasticizer, have shown a significant reduction in the glass transition temperature, while rubber modified blends exhibit no change in Tg.
L. Woo, Y.Wilson Cheung
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Reuse of post-consumer poly(ethylene terephthalate (PET) in toughened blends

2005
Post-consumer PET/ low-density polyethylene (LDPE) blends were prepared in a twin-screw extruder. Ethylene-octene rubbers grafted with different amounts of maleic anhydride (POF) were used as compatibilizer precursors to improve the compatibility between the two immiscible polymers.
AGLIETTO, MAURO, COLTELLI, MARIA BEATRICE, SAVI, STEFANIA, DELLA MAGGIORE I.   +3 more
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