Effect of CO2 laser radiation on the surface properties of polyethylene terephthalate

Dadsetan, Mahrokh; Mirzadeh, Hamid; Sharifi, Nafiseh

doi:10.1016/s0969-806x(99)00293-5

Cited by 53 publications

(43 citation statements)

References 21 publications

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“…The treatment with alkali or with cutinase induces a decrease in intensity of the carbonyl stretching band in both PET-Cr and PET-Am, confirming the involvement of the ester carbonyl in the chemical or biocatalytic attack. An analogous trend was observed by Dadsetan et al [37] in CO 2 laser irradiated films. At the same time, the marker bands attributed to the crystalline conformation of PET chains strengthen, suggesting an increase in crystallinity.…”

supporting

confidence: 86%

Surface structure and properties of poly-(ethylene terephthalate) hydrolyzed by alkali and cutinase

Donelli¹,

Freddi²,

Nierstrasz

et al. 2010

Polymer Degradation and Stability

168

100

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a b s t r a c tThis study was aimed at comparatively investigating the hydrolysis of crystalline and amorphous poly-(ethylene terephthalate) films by alkali and cutinase. Changes of surface properties were investigated by FTIR spectroscopy (ATR mode). The A 1341 /A 1410 and I 1120 /I 1100 absorbance ratios, and the full width at half maximum of the carbonyl stretching band (FWHM 1715 ) were used to evaluate the polymer crystallinity and its changes upon hydrolysis. The effect of different treatments on chain orientation was evaluated by calculating R ratios of appropriate bands. The spectroscopic indexes showed that both alkali and enzyme treatments induced structural and conformational rearrangements with a consequent increase in crystallinity in both amorphous and crystalline films. The crystalline PET film was modified more strongly by alkali than by cutinase, while the opposite occurred for the amorphous one. The trend of the water contact angle (WCA) clearly indicates that alkali is more effective than cutinase in enhancing hydrophilicity of PET films and that the effect is stronger on amorphous than on crystalline films. The values of WCA correlate well with the FTIR indexes calculated from the spectra of hydrolyzed crystalline PET films. The mechanism of the surface hydrolysis of PET by alkali and cutinase is discussed.

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supporting

confidence: 86%

Surface structure and properties of poly-(ethylene terephthalate) hydrolyzed by alkali and cutinase

Donelli¹,

Freddi²,

Nierstrasz

et al. 2010

Polymer Degradation and Stability

168

100

View full text Add to dashboard Cite

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“…27,28 The radicals, in contact with air, were rapidly modified into corresponding peroxides. The peroxide density was determined spectrophotometrically by means of the iodide method.…”

Section: Resultsmentioning

confidence: 99%

“…27,28 The film samples were irradiated using a line-tunable pulsed TEA CO 2 laser (Lumonics 103-2, Kanta, Ontario, Canada) at the wavelength of 9.25 m. The laser was operated at a repetition rate of 0.5 Hz and a fluence of 1.5 J/cm 2 . The strips of PET film were placed on a belt of a special step motor, and the irradiation was carried out in air with the desired pulses.…”

Section: Laser Treatmentmentioning

confidence: 99%

“…[21][22][23][24] Laser irradiation can induce photochemical reactions to the formation of new chemical species that could, in turn, improve the interactions between the polymer surface and the biological medium. [25][26][27] This work has been undertaken to study the graft polymerization of acrylic acid onto the polyethylene terephtalate (PET) surface using a CO 2 pulsed laser to improve blood compatibility. Graft polymerization was carried out by preirradiation of PET surface, fol-lowed by heating of irradiated PET in the aqueous solution of monomer.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Platelet adhesion on laser‐induced acrylic acid–grafted polyethylene terephthalate

Mirzadeh

Dadsetan

Sharifi-Sanjani

2002

J of Applied Polymer Sci

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ABSTRACT:To improve blood compatibility, acrylic acid (AAc) was grafted onto a polyethylene terephtalate (PET) film surface using lasers. The PET surface was irradiated with a CO 2 pulsed laser, and then graft copolymerization was carried out in an aqueous solution of AAc in the presence of Mohr's salt. Different techniques such as attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), scanning electron microscopy (SEM), and contact angle measurements were used to characterize the modified PET surface. The ATR-FTIR spectra confirmed the creation of new functional groups on the PET surface, and contact angle measurements revealed that the hydrophilicity of the PET surface increased as a result of the AAc graft polymerization. The electron micrographs showed that the grafting changed the surface morphology of the PET film. To evaluate the blood compatibility in vitro, the number of platelets adhering to the modified PET surface was determined using lactate dehydrogenase (LDH) activity measurement. The data from LDH method indicated that the extent of platelet adherence on the unmodified PET was much higher than that on the AAc grafted PET. The morphology of adhered platelets on the PET surface was investigated by SEM. The results showed that platelet adhesion and activation onto the PET surface was reduced because of AAc graft polymerization.

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“…Various method have been employed for the surface modification and etching of the PET film substrate. For instance, effects of nitrogen plasma [1], ammonia low-temperature plasma [2], air plasma [3], argon plasma [4], argon ion implantation [5], carbon dioxide laser [6], and vacuum-ultraviolet (VUV) [7] irradiations on the PET substrate have been revealed. With a miniaturization and multifunctionalization of an industrial product, control of material surface and interface has become important.…”

Section: Introductionmentioning

confidence: 99%

Surface Characteristics of Polyethylene Terephthalate (PET) Film Exposed to Active Oxygen Species Generated via Ultraviolet (UV) Lights Irradiation in High and Low Humidity Conditions

Oya

Watanabe

Sasaki

et al. 2014

J. Photopol. Sci. Technol.

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Polyethylene terephthalate (PET) has excellent transparency, heat resistance, electrical insulation, chemical resistance, and wear resistance. With a miniaturization and multifunctionalization of an industrial product, control of material surface and interface has become important. Active oxygen species were generated via 185/254 nm UV lights irradiation under conditions of high and low humidity, and PET films were exposed to the active oxygen species with these UV lights. Changes in their surface characteristics were evaluated. Contact angle of water droplet on the PET film surface and surface roughness after the treatment in the high humidity condition were higher than those in the low humidity condition, and transmittance of the PET film within a region of the visible light after the treatment in the high humidity condition decreased compared to that in the low humidity condition. The PET film surface can be modified more gently in the low humidity condition than in the high humidity condition.

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Effect of CO2 laser radiation on the surface properties of polyethylene terephthalate

Cited by 53 publications

References 21 publications

Surface structure and properties of poly-(ethylene terephthalate) hydrolyzed by alkali and cutinase

Surface structure and properties of poly-(ethylene terephthalate) hydrolyzed by alkali and cutinase

Platelet adhesion on laser‐induced acrylic acid–grafted polyethylene terephthalate

Surface Characteristics of Polyethylene Terephthalate (PET) Film Exposed to Active Oxygen Species Generated via Ultraviolet (UV) Lights Irradiation in High and Low Humidity Conditions

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