Studies on irradiated polypropylene, its copolymers and blends—I. ESR studies

Burlinska, G.; Bojarski, J.; Michalik, J.

doi:10.1016/0969-806x(95)00150-v

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…The decay of the allyl radicals is fast, in which they were completely disappeared after 3.5 h of irradiation. Previous ESR studies on irradiated polyethylene at room temperature claimed that the dominant component of signals of polyethylene radiolysis is the one originating from the allyl radicals of septet spectra 2, 6, 15, 16…”

Section: Resultsmentioning

confidence: 99%

“…The studies on the mechanism of radiation‐induced crosslinking and/or chain scission and radiation‐induced grafting are closely related with the radical process, and the behavior of the free radicals in polyethylene was the major interest in the field of radiation chemistry 1. The difference in the behavior of PE during irradiation depends not only on the nature of polymers but also on the polymer composition and the irradiation condition 2. Important changes in the physical and chemical properties resulting from the incorporation of special additives permit their use in applications where the polymer alone would have had small chance to meet certain performance applications.…”

Section: Introductionmentioning

confidence: 99%

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Carbohydrate antigen 19‐9 change during chemotherapy for advanced pancreatic adenocarcinoma

Reni

Cereda

Balzano

et al. 2009

Cancer

107

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Low‐density polyethylene (LDPE) composites modified with a resin based on ethylene/methacrylic acid copolymer (surlyn) and/or citric acid were electron beam‐irradiated and investigated by electron spin resonance (ESR) at room temperature. ESR studies were carried out directly after irradiation and after various time intervals up to 72 h postirradiation. The irradiated samples showed the ESR spectrum of seven lines that was assigned to the formation of allyl radical. The nature and yield of the allyl radical of the different LDPE samples were analyzed as a function of time after irradiation. Also, the radical concentration, decay, decay rate, and kinetics of radical decay were evaluated. Fourier transform infrared (FTIR) analysis at a series of different temperatures upon cooling from room temperature to −175°C and the reverse heating to +125°C was also carried out. The structural changes while cooling and heating of LDPE samples were investigated using FTIR spectrometry. The results showed that cooling of unirradiated LDPE samples to −175°C results in a decrease of the intensities of IR bands. However, heating the samples from −175°C up to +125°C led to a consequence increase in the intensities of the IR bands. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3461–3469, 2007

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carbohydrate antigen 19‐9 change during chemotherapy for advanced pancreatic adenocarcinoma

Reni

Cereda

Balzano

et al. 2009

Cancer

107

View full text Add to dashboard Cite

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“…Previous ESR studies on irradiated polyethylene at room temperature claimed that the dominant component of signals of polyethylene radiolysis is the one originating from the allyl radicals of septet spectra. 2,6,15,16 Because the used citric acid concentration (1.0 wt %) in LDPE blends is relatively small, it does not allow to observe its effect on the radical processes after irradiation. This may explain the similar shape of the septet structure of allyl radicals for pure LDPE and LDPE modified with 1 wt % of citric acid.…”

Section: Esr Characterizationmentioning

confidence: 99%

“…1 The difference in the behavior of PE during irradiation depends not only on the nature of polymers but also on the polymer composition and the irradiation condition. 2 Important changes in the physical and chemical properties resulting from the incorporation of special additives permit their use in applications where the polymer alone would have had small chance to meet certain performance applications. The types of additives lead to important physical changes.…”

Section: Introductionmentioning

confidence: 99%

ESR and FTIR studies on electron beam‐irradiated low‐density polyethylene blends

Ali

2006

J of Applied Polymer Sci

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Low-density polyethylene (LDPE) composites modified with a resin based on ethylene/methacrylic acid copolymer (surlyn) and/or citric acid were electron beam-irradiated and investigated by electron spin resonance (ESR) at room temperature. ESR studies were carried out directly after irradiation and after various time intervals up to 72 h postirradiation. The irradiated samples showed the ESR spectrum of seven lines that was assigned to the formation of allyl radical. The nature and yield of the allyl radical of the different LDPE samples were analyzed as a function of time after irradiation. Also, the radical concentration, decay, decay rate, and kinetics of radical decay were evaluated. Fourier transform infrared (FTIR) analysis at a series of different temperatures upon cooling from room temperature to Ϫ175°C and the reverse heating to ϩ125°C was also carried out. The structural changes while cooling and heating of LDPE samples were investigated using FTIR spectrometry. The results showed that cooling of unirradiated LDPE samples to Ϫ175°C results in a decrease of the intensities of IR bands. However, heating the samples from Ϫ175°C up to ϩ125°C led to a consequence increase in the intensities of the IR bands.

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Use of High-Energy Radiation in Polymer Blends Technology

Singh

Bahari²

2003

Polymer Blends Handbook

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Studies on irradiated polypropylene, its copolymers and blends—I. ESR studies

Cited by 7 publications

References 3 publications

Carbohydrate antigen 19‐9 change during chemotherapy for advanced pancreatic adenocarcinoma

Carbohydrate antigen 19‐9 change during chemotherapy for advanced pancreatic adenocarcinoma

ESR and FTIR studies on electron beam‐irradiated low‐density polyethylene blends

Use of High-Energy Radiation in Polymer Blends Technology

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