Radiation-induced grafting of styrene onto polyimide ion track membranes

Friese, K.; Plaček, V.; Mehnert, R.; Angert, N.; Spohr, R.; Trautmann, C.

doi:10.1016/0168-583x(95)00824-1

Cited by 9 publications

(5 citation statements)

References 7 publications

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“…Since the carboxyl groups in PAA must play an important role for the imaging mode owing to their affinity with alkaline solutions, we postulated that irradiation-induced imidization and decarboxylation of the PAA might have decreased the dissolution rate of the irradiated films in the alkaline etchant. 33 The change in the chemical structure of 89% imidized PAA films by 129 Xe 23+ ion beam irradiation with accumulated fluence of 1.0 × 10 10 ion/cm 2 was evaluated using ATR-IR. Subtraction spectra of the 89% imidized PAA films before and after the irradiation showed almost no change in the region of carbonyl groups from 1500 to 1800 cm -1 , even though the fluence of the 129 Xe 23+ ion was higher by 3 orders than that for the negative imaging.…”

Section: Resultsmentioning

confidence: 99%

“…There have been many reports on the mechanism of ion beam positive imaging in PET and PC, wherein a scission of the polymer main chains takes place by ion beam radiation, resulting in the decrease of the molecular weight of the polymers. − Accordingly, the positive images in the films with the imidization degrees of PAA ranging from 67 to 89% should be due to the scission of the polymer main chains. On the other hand, it is not easy to elucidate why the slight difference of imidization degree causes the reversal of image mode for the partially imidized PAA films.…”

Section: Resultsmentioning

confidence: 99%

“…The sole explanation given for this phenomenon has been cross-linking resulting from the energy deposition of the ion beams in polysilane and polysilicone films. − We tested for two other possibilities. Since the carboxyl groups in PAA must play an important role for the imaging mode owing to their affinity with alkaline solutions, we postulated that irradiation-induced imidization and decarboxylation of the PAA might have decreased the dissolution rate of the irradiated films in the alkaline etchant . The change in the chemical structure of 89% imidized PAA films by 129 Xe 23+ ion beam irradiation with accumulated fluence of 1.0 × 10 10 ion/cm 2 was evaluated using ATR-IR.…”

Section: Resultsmentioning

confidence: 99%

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Ion-Beam-Induced Dual-Tone Imaging of Polyimide via Two-Step Imidization

et al. 2002

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Dual-tone images in polyimide (Kapton) films were prepared by ion beam irradiation of partially imidized polyamic acid (PAA) films followed by alkaline etching in aqueous tetramethylammonium hydroxide (TMAH) solution. The treated films were heated at a final time for thermal stability. In partially imidized PAA films prepared at 150 °C, ion beam irradiation produced a negative hemispheric structured image with 1.0-μm height and 1.5-μm diameter. In contrast, a positive hole pattern with 0.3-μm diameter appeared on the partially imidized PAA film prepared at 145 °C. By determination of the precise imidization degree of precursor polymer films on the basis of adsorption strength of an imide ring C−N bond (1380 cm-1) in an attenuated total reflection infrared (ATR−IR) spectrum, it was revealed that the image mode of the films switches within a narrow range of imidization degree; positive and negative images were obtained from the PAA films with 67−83% and 89−94% imidization degrees, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Ion-Beam-Induced Dual-Tone Imaging of Polyimide via Two-Step Imidization

et al. 2002

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“…Until recently, a few research groups have attempted to apply the pre-irradiation method to new substrates of super engineering plastics, mostly based on aromatic polymers with high thermal and mechanical stabilities (for example, polyimide (PI) [31], polyethersulfone (PES) [32], and poly(ether ether ketone) (PEEK) [33][34][35]). However, they were not sure that the grafting reactions had occurred; the active sites on the base polymer backbone, which would initiate the grafting, were not confirmed.…”

Section: Recent Progressmentioning

confidence: 99%

Quantum-beam technology: A versatile tool for developing polymer electrolyte fuel-cell membranes

Yamaki

2010

Journal of Power Sources

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“…Modification of polyimide-based TM by radiation-induced grafting with styrene has been investigated. 6 Data on RIGP in latent tracks formed in polymer films irradiated with accelerated heavy ions have been reviewed. 7 The formation of poly-NIPAA gels in the pores of PETP-based TM has been studied.…”

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confidence: 99%

Properties of polymer track membranes modified by grafting with poly(2-methyl-5-vinylpyridine) and poly(N-isopropylacrylamide)

et al. 2000

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The properties of track membranes (TM) based on poly(ethylene terephthalate) (PETP) and polypropylene (PP) and modified by radiation-induced graft polymerization of 2-methyl-5-vinylpyridine (MVP) and N-isopropylacrylamide (NIPAA) were studied. The rate of grafting and the limiting degree of grafting increase linearly as the pore diameter of TM increases. The gasdynamic and hydrodynamic pore diameters of modified TM were determined. The dependence of water permeability of TM modified by grafting with poly(2-methyt-5-vinylpyridine) (PMVP) on the degree of grafting passes through a maximum, which. according to the data of wetting angle measurements, corresponds to the maximum hydrophilicity. The negative .'.-potential of TM changes sign after modification by grafting with PMVP. Thermosensitive TM based on PETP and PP were prepared by radiation-induced graft polymerization of N IPAA. The structure of modified TM was studied by electron microscopy and atomic force microscopy.Key words: track membranes, grafting, modification, hydrophilicity, water flow rate, electrophysical properties of surface, v-radiation, phase transitions, atomic force microscopy.Recently, polymer track membranes (TM) have attracted considerable interest. These membranes are prepared by irradiation of polymer films with accelerated heavy ions followed by etching. By choosing appropriate conditions for irradiation and etching it is possible to prepare a rather wide assortment of polymer TM, which can be used in biotechnology, medicine, ecology, etc. 1,2 Modification of polymer TM by grafting with different polymers extends the possibilities of their use. Particularly topical is the development of methods for hydrophilization of polymer TM. In the case of TM based on poly(ethylene terephthalate) (PETP) it is important to prepare hydrophilic membranes with small pores (<0. I ~tm), whereas hydrophobic membranes based on polypropylene (PP) require hydrophilization irrespective of the pore diameter, Preparation of po_!ymer TM modified with so-called "smart" polymers, which respond to slight changes in the properties of the environment (temperature, pH, ionic strength, and electric field), is also topical. In this case, the modified TM can be considered controllable.The aim of this work was to prepare hydrophilic and thermosensitive TM by grafting with the widely used hydrophilic polymer poly(2-methyl-5-vinylpyridine) (PMVP) and with a "smart" thermosensitive polymer poly(N-isopropylacrylamide) (poly-NIPAA). This problem was solved using radiation-induced graft polymerization (RIGP), which is a universal method for modification of polymers of virtually any chemical nature. 3,4 The effect of the pore size of TM on several RIGP parameters was also studied.Information on the use of R1GP for modification of TM is rather scarce despite the fact that investigations in this area 5-s have been rapidly progressing recently. Radiation-induced grafting of several monomers into PETP-based TM has been outlined 5 and permeability of choline chloride and insulin throu...

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Radiation-induced grafting of styrene onto polyimide ion track membranes

Cited by 9 publications

References 7 publications

Ion-Beam-Induced Dual-Tone Imaging of Polyimide via Two-Step Imidization

Ion-Beam-Induced Dual-Tone Imaging of Polyimide via Two-Step Imidization

Quantum-beam technology: A versatile tool for developing polymer electrolyte fuel-cell membranes

Properties of polymer track membranes modified by grafting with poly(2-methyl-5-vinylpyridine) and poly(N-isopropylacrylamide)

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