The structure of electron beam-modified poly(ethylene terephthalate) films

Красовский, А. Н.; Osmolovskaya, N. A.; Myakin, S. V.; Vasil'eva, I. V.; Новиков, Д. В.

doi:10.1134/s0018143909020052

Cited by 3 publications

(14 citation statements)

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“…The surface tension σ of the fi lms at the boundary with isooctane, toluene, ethanol, and water was measured with a Du Noüy tensiometer in the range σ = 18.4-72 mN m -1 at 25°С [7,11]. The accuracy of determining σ was ±0.3% (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The degree of crystallinity ae of the irradiated PET fi lms was calculated from the fi lm density measured in the heptane-CCl 4 mixture at 25°С [7] (Fig. 2).…”

Section: Methodsmentioning

confidence: 99%

“…Studies of PET fi lms irradiated with accelerated electrons showed [6,7] that the concentration of hydroxy and carboxy groups formed by hydrolysis of ester groups of the polymer increased at the absorbed dose D close to 100 kGy. The molecular weight of the samples in the range D = 25-300 kGy decreased insignifi cantly [6].…”

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confidence: 99%

“…It can be expected [7] that wetting of PET fi lms with polar and nonpolar adhesives [4] after preliminarily irradiation of the fi lms with accelerated electrons should strongly depend on the morphological structure and composition of surface functional groups of PET.…”

mentioning

confidence: 99%

“…It should be noted that the changes in the amorphouscrystalline structure and composition of functional groups in irradiated PET fi lms are insuffi ciently understood [6,7]. At the same time, data on the functional group composition and morphology of irradiated fi lms are important for the technology of composite materials based on PET [1].…”

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Adhesion-strong polymeric layers on polyethylene terephthalate films modified by irradiation with accelerated electrons

et al. 2012

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Regular trends in variation of the functional group composition, surface energy, and amorphouscrystalline structure of oriented polyethylene terephthalate fi lms modifi ed by irradiation with accelerated electrons to the absorbed dose in the range 25-300 kGy were studied by the methods of surface tension, indicator dye adsorption, and X-ray diffraction. The possibility of preparing gelatin emulsion layers exhibiting high adhesion strength was examined. on the surface of biaxially oriented polyethylene terephthalate (PET) fi lms is of particular interest [1]. It is known [1] that the hydrophobic properties of PET depend on the specimen density and extension ratio. As the fi lm crystallinity increases, the molecular volume of PET decreases. Therefore, because of high dispersion energy of wetting of such PET specimens [2], introduction of hydrophilic polymeric adhesives into the surface layer of amorphous-crystalline fi lms is hindered [3].Prior to application of polymeric layers onto the PET fi lm surface, it is made hydrophilic, e.g., by exposure to corona discharge [1,4]. The required degree of the fi lm hydrophilization, ensuring their wetting in aqueousorganic media, is attained by application of several layers in the order of increasing hydrophilicity [1]. Copolymers of styrene, butyl acrylate, and acrylic acid are used as materials for the fi rst layer. To attain high strength, heat resistance, and low swelling in aqueous medium, the gelatin and its hardeners are frequently included in formulations for second and further polymeric layers [1,3].At the same time, the known methods for hydrophilization of the surface of PET fi lms [1], including treatment with corona [4] and glowing discharge [5], have certain drawbacks. In particular, devitrifi cation of the fi rst polymeric layer on fi lms preliminarily exposed to corona discharge leads to an appreciable decrease in the strength of the multilayer system [1].Studies of PET fi lms irradiated with accelerated electrons showed [6,7] that the concentration of hydroxy and carboxy groups formed by hydrolysis of ester groups of the polymer increased at the absorbed dose D close to 100 kGy. The molecular weight of the samples in the range D = 25-300 kGy decreased insignifi cantly [6].A study of the adsorption centers on the PET surface showed [6] that the maximal degree of the fi lm hydrophilization was attained at D close to 100 kGy owing to a decrease in the amount of all the adsorption centers except Brønsted acid centers with рK а 5 [8]. An increase

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Section: Methodsmentioning

confidence: 99%

“…The degree of crystallinity ae of the irradiated PET fi lms was calculated from the fi lm density measured in the heptane-CCl 4 mixture at 25°С [7] (Fig. 2).…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Adhesion-strong polymeric layers on polyethylene terephthalate films modified by irradiation with accelerated electrons

et al. 2012

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Natural sunlight ageing of control and sterilized poly(ethylene terephthalate): Two‐dimensional infrared correlation spectroscopic investigation

Lafi

Abboudi

Aljoumaa

2016

J of Applied Polymer Sci

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Attenuated total reflection Fourier transform infrared (ATR‐FTIR) and two‐dimensional correlation (2D‐COS) spectroscopies were utilized to probe the structural changes occurring upon sunlight ageing up to 6 months in air atmosphere of both control and sterilized poly(ethylene terephthalate), (PET) bottles.Two dominant reactions were found; namely oxidation of the carbonyl groups and trans to gauche transformation of the ethylene glycole units. Oxidation manifested itself by the progressive development of a distinct band at 1690 cm−1assigned to the antisymmetric stretching of the carbonyl band in an aromatic carboxylic acid. Sterilizing the bottles by E‐beam or Gamma rays prior to ageing reduced the correlation intensity of the band at 1690 cm−1, and led to the presence of higher molecular weight compounds such as terephthalic acid in stored water. The infrared spectroscopy combined with 2D‐COS provides a powerful tool to investigate chemical and stero‐chemical modification of polymers. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44736.

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Atmospheric Pressure Plasma Helix Polyethylene terephthalate Surface Activation and Its Electron Density Measurement

Huang

Jiang

2021

High Energy Chem

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The structure of electron beam-modified poly(ethylene terephthalate) films

Cited by 3 publications

References 2 publications

Adhesion-strong polymeric layers on polyethylene terephthalate films modified by irradiation with accelerated electrons

Adhesion-strong polymeric layers on polyethylene terephthalate films modified by irradiation with accelerated electrons

Natural sunlight ageing of control and sterilized poly(ethylene terephthalate): Two‐dimensional infrared correlation spectroscopic investigation

Atmospheric Pressure Plasma Helix Polyethylene terephthalate Surface Activation and Its Electron Density Measurement

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