Effect of oxygen radical and oxygen ion irradiation on biaxially stretched poly(ethylene terephthalate) surface studied by sum-frequency generation

Miyamae, Takayuki; Yamada, Yasumi; Uyama, Haruo; Nozoye, Hisakazu

doi:10.1016/s0169-4332(01)00329-4

Cited by 20 publications

(17 citation statements)

References 28 publications

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“…Figure b shows the SFG spectra for PET films prepared from solutions with different addition of water. The pronounced peak at 1720 cm –1 in the ssp spectra is attributed to the stretching vibration of the ester carbonyl group . , The SFG signal has been verified to originate from the free surface and not from the PET/substrate interface or bulk . The strong peak observed in the ssp spectra shows that the stretching vibration of the ester carbonyl group can be detected in the direction normal to the free surface, while the absence of a resolvable signal in the ppp spectra shows that there is no stretching vibration detected parallel to the surface (Figure b, 0 vol % water), which was similar to the symmetric C–H stretching of the ester methyl groups on poly(methyl methacrylate) (PMMA) surface in the same geometry, and calculation showed that the ester methyl groups were oriented toward the surface normal .…”

Section: Resultsmentioning

confidence: 86%

Conformation-Sensitive Surface Dynamics in Thin Poly(ethylene terephthalate) Film

Zhang

et al. 2019

Macromolecules

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The surface average conformation of poly(ethylene terephthalate) (PET) films was modulated by adjusting the water content in corresponding trifluoroacetic acid (TFA) spin-coating solutions, which was confirmed by surface-sensitive sum frequency generation (SFG) vibrational spectroscopy. Molecular dynamics simulation results showed that the added water molecules partly disrupt the hydrogen bond network between TFA molecules and PET chains and make it possible to preserve the statistical average bulk-like spherical conformation at the film surface during the formation of PET film. Slower surface crystallization kinetics, higher surface glass transition temperature (T g surface ), and suppressed T g -confinement effect were observed when the surface average conformation changed from oriented oblate ellipsoidal conformation to isotropic spherical conformation, showing that surface dynamics is very sensitive to chain conformation.

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Section: Resultsmentioning

confidence: 86%

Conformation-Sensitive Surface Dynamics in Thin Poly(ethylene terephthalate) Film

Zhang

et al. 2019

Macromolecules

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“…Such a sputter-induced chemical transformation is still observable at low beam energy 7 and with other ion species. 8 For example, organic sulfonates in poly(styrene sulfonate) (PSS) are transformed to thiols by 0.2 kV Ar + sputtering, 7 ester groups in poly(ethylene terephthalate) (PET) are preferentially removed by 0.5 kV Ar +9 or 0.4 kV O + , 10 and C]O groups in poly(methyl methacrylate) (PMMA) are reduced into C-O groups by Ar plasma. 11 Buckminsterfullerene (C 60 ) ions have recently been used to sputter materials for studying organic thin films in XPS.…”

Section: Introductionmentioning

confidence: 99%

Sputter-induced chemical transformation in oxoanions by combination of C60+ and Ar+ ion beams analyzed with X-ray photoelectron spectrometry

Lin

Chen

et al. 2009

Analyst

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The change of the chemical states of inorganic oxoanion salts by low-energy single atomic projectiles (0.5 kV Ar(+)), high-energy cluster ion beams (10 kV C(60)(+)), and mixed 0.2 kV Ar(+) and 10 kV C(60)(+) are presented. Although the sputtering conditions of C(60)(+) and C(60)(+)-Ar(+) mixed sputtering used in this work provide more accurate results for profiling organic films than Ar(+) sputtering, the difference in profiling inorganic materials is not as dramatic. For inert oxoanions like carbonate and phosphate, both Ar(+) and C(60)(+) sputtering cause unappreciable sputter-induced chemical transformation to the remaining surface. For reactive oxoanions like nitrate, perchlorate, chlorate, and chlorite, although C(60)(+) yields slightly better results than Ar(+) sputtering due to the thinner disturbed layer, all the ion beams altered the chemical state significantly. As a result, none of these techniques can be used to provide true information below the surface. For intermediate oxoanions like nitrite and thio-S in thiosulfate, C(60)(+) yields slightly better results than Ar(+) sputtering. However, for sulfonate and the core-S in thiosulfate, C(60)(+) causes more sputter-induced chemical transformation than Ar(+) sputtering.

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“…The pronounced peak at 1720 cm −1 in the ssp spectra is attributed to the stretching vibration of the ester carbonyl group . 57,58 The SFG signal has been verified to originate from the free surface and not from the PET/substrate interface or bulk. 58 It was obvious that the strong peak at 1720 cm −1 was observed in the ssp spectra for the 20 nm supported PET film with a 0.5 nm adsorbed layer, while this peak was very weak for that with a 5.6 nm adsorbed layer, which was similar to the ssp spectra obtained from the adsorbed layer.…”

Section: Effect Of the Thickness Of The Adsorbed Layer On The Crystal...mentioning

confidence: 95%

Interfacial Effect in Supported Thin PET Films Covered with a Thin PPO Layer

Sun

et al. 2020

Macromolecules

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The thickness dependent chain mobility in polymer films influenced by the interfacial effect was investigated by the cold crystallization behavior of thin poly(ethylene terephthalate) (PET) films covered by a thin poly(2,6-dimethyl-1,4-phenyleneoxide) (PPO) layer to eliminate the free surface effect. Two characteristic film thicknesses were observed, which were related to the long-range perturbations of the interfacial effect. Below the first thickness (h s*), the bulk-like crystallization temperature of PET films begins to shift upward, and below the second thickness (h n*), crystallization of PET films is completely suppressed. These two characteristic thicknesses are proportional to the adsorbed layer thickness. We found that h s* is much greater than the thickness of the PET film with a free surface, while h n* is independent of the free surface. This result indicated that the thickness for the suppression of polymer film dynamics can be increased by removing the contribution of the free surface. The value of h n * independent of the free surface may be attributed to the fact that the chain conformation within this thickness adopts the chain conformation at the interface, causing the “free surface” to vanish. The chain conformations affected by the substrate are another cause of long-range perturbations.

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Effect of oxygen radical and oxygen ion irradiation on biaxially stretched poly(ethylene terephthalate) surface studied by sum-frequency generation

Cited by 20 publications

References 28 publications

Conformation-Sensitive Surface Dynamics in Thin Poly(ethylene terephthalate) Film

Conformation-Sensitive Surface Dynamics in Thin Poly(ethylene terephthalate) Film

Sputter-induced chemical transformation in oxoanions by combination of C60+ and Ar+ ion beams analyzed with X-ray photoelectron spectrometry

Interfacial Effect in Supported Thin PET Films Covered with a Thin PPO Layer

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