Characterizations of heavy ion irradiated PET membranes

Takahashi, Shinji; Yoshida, Minoru; Asano, Masaharu; Notomi, Mitsuo; Nakagawa, Tsutomu

doi:10.1016/j.nimb.2003.10.017

Cited by 16 publications

(7 citation statements)

References 15 publications

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“…The absorption band at 2977 cm −1 is assigned for symmetric stretching29 of CH. Some other bands28–32 that appeared in the spectra are summarized in Tables III and IV. Here again it was observed that after irradiation, the peak intensity decreased with increasing fluences.…”

Section: Resultsmentioning

confidence: 99%

High‐energy heavy‐ion irradiation effects in makrofol‐KG polycarbonate and PET

Ramola

Negi

Semwal

et al. 2011

J of Applied Polymer Sci

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This experimental study investigated the modification of optical, structural and morphological properties of Makrofol‐KG and Polyethylene Terephtalate (PET) by irradiation of 120 MeV Ni+9 ions at fluences ranging from 1 × 1010 to 1 × 1012 ion/cm2. Optical and structural properties were studied by UV–visible spectroscopy and X‐ray diffraction (XRD) method, respectively. XRD studies of pristine and irradiated polymers revealed that crystallinity decreased after irradiation with swift heavy ions. The UV–visible spectrum displayed a shift in absorbance edge toward higher wavelength at higher fluence, which can be correlated with transition involved in polymers. Fourier transform infrared spectroscopy spectra were analyzed to investigate the changes in the chemical/structural properties of these polymers. The Makrofol‐KG is found to exhibit more pronounced modification compared to PET after irradiation by swift heavy ions. The surface morphology studied by atomic force microscopy showed that the roughness of polymers surface increased with increasing fluence. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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Section: Resultsmentioning

confidence: 99%

High‐energy heavy‐ion irradiation effects in makrofol‐KG polycarbonate and PET

Ramola

Negi

Semwal

et al. 2011

J of Applied Polymer Sci

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“…As described in a previous paper. 5 PET has high tensile strength and elongation, i.e., so-called tough material. …”

Section: Resultsmentioning

confidence: 99%

“…The cross-linking region is known as the penumbra, as reported in an earlier chapter. 5 Decreasing elongation at break may contribute to polymer chain scission by ion irradiation. Elongation at the break and the tensile strength was decreased by etching [Line (c) in Figure 5].…”

Section: ·-• • • •mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…PET membranes have higher mechanical strength and undergo various chemical changes in response to ion irradiation easily and thus are optimum material for gas-permeation membrane. [1][2][3][4][5][6] We previously reported the effects of heavy-ion irradiation on the gas permeation of a PET membrane.7 A portion of the heavy-ion irradiated PET membranes exhibits Knudsen flow during gas-permeation measurement. Energetic heavy ions are ionizing particles that create zones of high-density excitations and ionizations as they pass through membrane materials and cause many effects due to a high local dose within ion tracks.…”

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Gas-Permeation Control by PET Membranes with Nanosized Pores

Takahashi

Yoshida²,

Asano³

et al. 2004

Polym J

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KEY WORDSGas-Permeation / PET / Heavy-ion Irradiation / Etching / Nanosized Pore / Knudsen Flow / PET is a polymer widely used for fibers, films, and bottles. The gas permeability properties of PET, which is often used as a gas-barrier film, can easily be modified using techniques such as ion irradiation. PET membranes have higher mechanical strength and undergo various chemical changes in response to ion irradiation easily and thus are optimum material for gas-permeation membrane. [1][2][3][4][5][6] We previously reported the effects of heavy-ion irradiation on the gas permeation of a PET membrane.7 A portion of the heavy-ion irradiated PET membranes exhibits Knudsen flow during gas-permeation measurement. Energetic heavy ions are ionizing particles that create zones of high-density excitations and ionizations as they pass through membrane materials and cause many effects due to a high local dose within ion tracks. We thus applied etching utilizing NaOH solution as an etchant control nanosized pores of the heavy ion-irradiated PET membranes. In the past, much attention was paid to track etching in various polymer membranes with respect to applications in nuclear fusion, medical, material technology and other fields. [8][9][10][11][12][13][14][15][16] In the present study, PET membranes were irradiated at a fluence of 3 Â 10 9 ions/cm 2 and etched in 6N or 1N NaOH solution at 60 C. Etching time was controlled to observe changes in the gas-permeation behavior depending on the etching. Pore-size distribution in the membranes exhibiting Knudsen flow during gas-permeation measurement was observed using the nano-permporometer and permporometer. EXPERIMENTALThe poly(ethylene terephthalate) (PET) membrane used in this study was obtained from Hoechst Japan Co., Ltd. Thickness of the PET membrane was 12 mm, and each had a semicrystalline structure of approximately 40 % crystallinity and density of 1.4 g/cm 3 . Xe ions were used at a fluence of 3 Â 10 9 ions/cm 2 for heavy-ion irradiation. A PET membrane of 12 mm thickness was cut into a 50 Â 50 mm squares and then attached to a glass 50 Â 50 Â 1 mm plate. The chamber for formation of the ion-track pores in the membrane, connected to the Azimuthally Varying Field (AVF) cyclotron in the Takasaki Ion Accelerators for Advanced Radiation Applications (TIARA), Japan Atomic Energy Research Institute (JAERI), was designed for alternate use of turntable-type and roll-type film-carrying systems. Irradiation was performed under vacuum. The apparatus for Xe ion irradiation has been described previously. 7We applied etching using NaOH solution to control nanosized pores. PET membranes irradiated at a fluence of 3 Â 10 9 ions/cm 2 were etched in 6N or 1N NaOH solution at 60 C as shown in Figure 1. Etching time was controlled to observe changes in the gas-perEtching 1N or 6N -NaOH Temperature: 60°C Figure 1. Illustration of the nuclear track membrane-production method.

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Thermal degradation and ageing behavior of microcomposites of natural rubber, carboxylated styrene butadiene rubber latices, and their blends

Stephen

Siddique

Singh

et al. 2007

J of Applied Polymer Sci

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The effect of microfillers on the thermal stability of natural rubber (NR), carboxylated styrene butadiene rubber (XSBR) latices, and their 70/30 NR/XSBR blend were studied using thermogravimetric method. Microcomposites of XSBR and their blend were found to be thermally more stable than unfilled samples. The activation energy needed for the degradation of polymer chain was calculated from Coats-Redfern plot. Activation energy needed for the thermal degradation of filled samples was higher than unfilled system. It indicated the improved thermal stability of the filled samples. The ageing resistance of the micro-filled samples was evaluated from the mechanical properties of aged samples. The thermal ageing was carried out by keeping the samples in hot air oven for 7 days at 708C. The mechanical properties such as tensile strength, modulus at 300% elongation, and strain at break were computed. As compared to unfilled samples, micron-sized fillers reinforced systems exhibited higher ageing resistance. Finally, an investigation was made on the influence of ion-beam irradiation on microcomposites of NR, XSBR latices, and their 70/30 blend systems using 28 Si 8þ performed at 100 MeV. The surface changes of the samples after irradiation were analyzed using X-ray photoelectron spectroscopy. The results of XPS measurements revealed that the host elements were redistributed without any change in binding energies of C 1s , O 1s , and Si 2p .

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Characterizations of heavy ion irradiated PET membranes

Cited by 16 publications

References 15 publications

High‐energy heavy‐ion irradiation effects in makrofol‐KG polycarbonate and PET

High‐energy heavy‐ion irradiation effects in makrofol‐KG polycarbonate and PET

Gas-Permeation Control by PET Membranes with Nanosized Pores

Thermal degradation and ageing behavior of microcomposites of natural rubber, carboxylated styrene butadiene rubber latices, and their blends

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