Structural and chemical modification of polymer composite by proton irradiation

Shah, Sejal; Qureshi, Anjum; Singh, Navjot; Kulriya, P.K.; Singh, Kirti; Avasthi, D. K.

doi:10.1016/j.surfcoat.2009.02.052

Cited by 23 publications

(10 citation statements)

References 20 publications

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“…In general, this technique induces various improvements to the mechanical, tribological, optical and electrical properties of polymers [142] but may also lead to ionization, displacing atoms, sputtering, carbonization, production of free radicals, which induce cross-linking and chains scission that gradually and continuously contribute to modify or degrade the properties of polymer [143]. In the literature, we only found two papers, written by the same research group, dealing with the modification of an ENC (Topas 6015S-04) by ion beams (C 4? and N 4? )…”

Section: Ion Beamsmentioning

confidence: 99%

Physico-chemical ageing of ethylene–norbornene copolymers: a review

et al. 2017

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The main object of this report is to review and summarize the current state of the scientific literature relating to physico-chemical ageing of ethylene-norbornene copolymers (ENCs). These processes occur through different means such as photodegradation under the effect of ultraviolet radiation, temperature and ionizing radiation (under air or oxygen). In most cases ageing causes chains scissions that lead to the creation of degradation compounds that exhibit high mobility, corresponding to their low molecular weight and/or high polarity. Cross-linking can also occur, leading to the modification of mechanical properties. The presence of oxygen during ageing is of great importance for the physico-chemical modifications of those polymers in terms of oxidation and thermal stability. ENCs belong to cyclic olefin copolymers (COC) class, whose synthesis was developed in the late 1950s. Nevertheless, commercial applications are relatively new. They attract growing interest in different fields, due to their very useful physical and chemical properties such as transparency, heat and chemical resistance, low permeability to gas as well as biocompatibility. In the literature, a large number of papers deal with the synthesis and characterization of different grades of ENC, but only a few deal with the effects of ageing on these materials. This literature review consists of a summary of the main milestones in the development of COC as well as of cyclic olefin polymers (COP), a review of main techniques for predicting ageing, degradation of additives and interaction between COC/COP and contact environment as well as toxicity of the extractables.

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Section: Ion Beamsmentioning

confidence: 99%

Physico-chemical ageing of ethylene–norbornene copolymers: a review

et al. 2017

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“…The irradiated PP samples showed a XRD peak at 2Theta ≈ 9 , attributed to polyamorphous polypropylene (C 3 H n , which allow us to state that the irradiation of PP promotes the amorphousization on the material and the incorporation of defect and stresses. As presented in the 9 Shah et al 12 irradiated PMMA composite with 3 MeV proton beam, which has decreased the crystallite size and degree of crystallinity. Other authors reported also amorphousization in different materials, depending of the radiation type, but especially dependent of the radiation energy.…”

Section: Materials Testsmentioning

confidence: 99%

“…Electronic excitation, ionization, chain scission, cross-linking and mass losses are the major events for macroscopic changes in polymers. [9][10][11][12] In this work, a wide range of polymeric materials were irradiated under megavoltage radiation using a radiotherapy linear accelerator. The irradiated materials were then imaged using transmission X-ray tomography to determine if some radiation induced electronic density change could result in altered Hounsfield units (related to the linear attenuation coefficient, an important parameter for external radiotherapy clinical dosimetry treatment planning).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Megavoltage Radiation on Polymeric Materials to be Used in Biomedical Devices

Neto¹,

Lencart²,

Dias³

et al. 2012

j nanosci nanotechnol

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For a number of biomedical applications, including the development of phantoms for quality control of radiotherapy treatments and dose determination, it is important to study the radiation response of the used materials, in order to distinguish the relevant dose distribution modifications from the artifacts caused by the phantom material when subjected to high dose irradiation. Beside the radiation response, those materials should have certain physical and chemical properties in order to be able to be used for the purposes described above, i.e., mechanical hardness and inelasticity, chemically stability and nonreactive, among others. In this work, a wide range of polymeric materials were irradiated under megavoltage radiation using a radiotherapy linear accelerator. The irradiated materials were imaged using transmission X-ray tomography to determine if some radiation induced electronic density change could result in altered Hounsfield units. Furthermore, Raman Spectroscopy and X-ray Diffraction (XRD) techniques were used before and after irradiation in order to study any structural modification induced by the radiation. In addition, a special phantom simulating a breast treatment with two tangential beams has been fabricated and tested.

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“…There has been some research conducted on the proton irradiation exposure and its effects on polymers. Shah et al [22] has examined the structural and chemical modification of polymer composite by proton irradiation. It was reported that the polymeric structure got damaged and the surface morphology showed partial agglomeration after proton irradiation.…”

Section: Introductionmentioning

confidence: 99%

Surface molecular degradation of high performance carbon/bismaleimide composites induced by proton irradiation

Chen

et al. 2011

Nuclear Instruments and Methods in Physics Research Section B:

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Structural and chemical modification of polymer composite by proton irradiation

Cited by 23 publications

References 20 publications

Physico-chemical ageing of ethylene–norbornene copolymers: a review

Physico-chemical ageing of ethylene–norbornene copolymers: a review

The Effect of Megavoltage Radiation on Polymeric Materials to be Used in Biomedical Devices

Surface molecular degradation of high performance carbon/bismaleimide composites induced by proton irradiation

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