Physico-chemical modifications induced in polymers by swift heavy ions

Balanzat, E.; Bouffard, S.; Moël, A. Le; Betz, N.

doi:10.1016/0168-583x(94)96204-9

Cited by 93 publications

(40 citation statements)

References 25 publications

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“…It is important to note, that the spatial domain of the energy deposition events ͑and not just the mean deposited energy or energy fluence͒ can be important for the formation of these highly reorganized structures. Such effects have been observed in the vinyl formation induced by MeV electrons and heavy ions in polyethylene 14 and in the efficiency of GeV and MeV ions to produce aromatic structures in PMMA. 28 …”

Section: Uv-vis Spectroscopymentioning

confidence: 94%

“…Also, the use of heavy ions in the GeV range has demonstrated the possibility of nonconventional pathways in chemical modification of polymers. 14,28 Finally, although the importance of the deposited energy density on the ion-induced chemical modification of polymers has been recognized in the literature, systematic quantitative studies connecting the chemical damage in polymers and the deposited energy density in the MeV ion tracks are still lacking. Also, the initial velocity of the high-energy primary ions has not been kept constant in previous investigations, and hence the track radial dimensions vary for the different primary ions used as projectiles.…”

Section: Introductionmentioning

confidence: 99%

“…For MeV ion-solid interactions, it is well known ͑from, e.g., biomolecular damage, electronic sputtering and latent track investigations͒ that the ion stopping power in the solid does not alone characterize the energy density deposited in the targets. [11][12][13][14] Part of the energy deposited by the primary ions is transported far away from the path of the ion by means of secondary electrons produced as a result of the primary ionizations. A detailed description of ion tracks involves the knowledge of double differential cross sections for the emission angle and energy of the secondary electrons and electron interaction cross sections for the target atoms and molecules, which are generally not known.…”

Section: Introductionmentioning

confidence: 99%

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Chemical damage in poly(phenylene sulphide) from fast ions: Dependence on the primary-ion stopping power

et al. 1996

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Thin poly͑phenylene sulphide͒ foils were bombarded with fast atomic ions ͑ 4 He, 12 C, 16 O, 32 S, 79 Br, 127 I͒ in the energy range between 2.5 to 78 MeV. In order to maintain the same ion track size for all impacting ions, their initial velocity was kept constant at 1.1 cm/ns. Under these conditions the deposited energy density in a single ion track changes as a result of the varying stopping power (dE/dx) of the projectiles in the material. Fourier transform infrared spectroscopy and UV-visible spectroscopy were used to characterize the irradiated targets. Damage cross sections ͑ ͒ for different chemical bonds, such as C-S and ring C-C bonds, are extracted from the IR data. For all analyzed IR bands, the values of scale roughly with the square of dE/dx ͑energy density in a single ion track͒. The absorption of the irradiated samples in the visible and UV region increases as a function of fluence. The rate of increase of absorption at a particular wavelength scales also as (dE/dx) n with nϷ2. The observed nonlinear dependence of the damage cross sections on the deposited energy density is considered in the light of two models: a statistical model based on the fluctuations of the energy deposited by the primary ions ͑hit theory͒ and an activation ͑thermal spike͒ model. It is found that the damage cross section is not determined directly by the initial deposited energy density distribution. The best agreement between experiment and theory is obtained when transport of the deposited energy occurs.

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Section: Uv-vis Spectroscopymentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chemical damage in poly(phenylene sulphide) from fast ions: Dependence on the primary-ion stopping power

et al. 1996

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“…If the radiation dose be so high that ion tracks overlap, the physical and chemical properties of the material can also be altered on a macroscopic scale to such an extent that it can be considered a new material with new properties. Various modifications in polymeric materials have been observed due to irradiation of polymers with energetic heavy ions [2,3]. This happens due to high value of the electronic stopping power or high linear energy transfer (LET) of the ions which induces an unusual density of the electron hole pairs close to ion path.…”

Section: Introductionmentioning

confidence: 99%

Dielectric response of makrofol-KG polycarbonate irradiated with 145 MeV Ne6+ and 100 MeV Si8+ ions

Kumar

Ali

et al. 2009

Indian J Phys

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The passage of heavy ions in a track detector polymeric material produces lattice deformations. These deformations may be in the form of latent tracks or may vanish by self annealing in time. Heavy ion irradiation produces modifications in polymers in their relevant electrical, chemical and optical properties in the form of rearrangement of bonding, cross-linking, chain scission, formation of carbon rich clusters and changes in dielectric properties etc. Modification depends on the ion, its energy and fluence and the polymeric material. In the present work, a study of the dielectric response of pristine and heavy ion irradiated Makrofol-KG polycarbonate is carried out. 40 μm thick Makrofol-KG polycarbonate films were irradiated to various fluences with Si 8+ ions of 100 MeV energy from Pelletron at Inter University Accelerator Centre (IUAC), New Delhi and Ne 6+ ions of 145 MeV from Variable Energy Cyclotron Centre, Kolkata. On irradiation with heavy ions dielectric constant ( ) decreases with frequency where increases with fluence for both the ions. Variation of loss factor (tan ) with frequency for pristine and irradiated with Si ions reveals that tan increases as the frequency increases. Tan also increases with fluence. While Ne irradiated samples tan shows slight variation with frequency as well as with fluence. Tan has positive values indicating the dominance of inductive behavior.

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“…The availability of heavy ion accelerator has brought new impetus to the field of ion beams modification as dramatic modifications in polymeric material have been observed [9][10][11][12][13][14]. It has been reported that swift heavy ion irradiation in polymers leads to an increase in light absorption mainly in shorter wavelength region [15]. In the present investigations comparative study of 100 MeV Si 8+ ion and 145 MeV Ne 6+ ion induced modifications in the optical properties of polypropylene (PP) films and their dependence on ion parameters are carried out through UV-Vis spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Study of optical band gap and carbon cluster sizes formed in 100 MeV Si8+ and 145 MeV Ne6+ ions irradiated polypropylene polymer

et al. 2009

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A wide variety of material modifications in polymers have been studied by using ion irradiation techniques. Extensive research has focused on to Swift Heavy Ions (MeV's energy), probably because of good controllability and the large penetration length in polymers. High energy ion irradiation tends to damage polymers significantly by electronic excitation and ionization. It may result into the creation of latent tracks and can also cause formation of radicals such as ablation, sputtering, chain scission and intermolecular cross-linking, creation of triple bonds and unsaturated bonds and loss volatile fragments. Polypropylene polymer films of thickness 50 μm were irradiated to the fluences of 1 × 10 10 , 3 × 10 10 , 1 × 10 , 10 12 and 10 13 ions/cm 3 from Variable Energy Cyclotron Centre, Kolkata. Optical modifications were characterized by UV towards the red end of the spectrum with the increase of the fluence. Value of optical band gap E g shows a decreasing trend with ion fluence irradiated with both kinds of ions. Cluster size N, the number of carbon atoms per conjugation length increases with increasing ion dose. Cluster size also increases with the increase of electronic stopping power.

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Physico-chemical modifications induced in polymers by swift heavy ions

Cited by 93 publications

References 25 publications

Chemical damage in poly(phenylene sulphide) from fast ions: Dependence on the primary-ion stopping power

Chemical damage in poly(phenylene sulphide) from fast ions: Dependence on the primary-ion stopping power

Dielectric response of makrofol-KG polycarbonate irradiated with 145 MeV Ne6+ and 100 MeV Si8+ ions

Study of optical band gap and carbon cluster sizes formed in 100 MeV Si8+ and 145 MeV Ne6+ ions irradiated polypropylene polymer

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