High-energy radiation forming chain scission and branching in polypropylene

Otaguro, Harumi; Lima, L.F.C.P.; Parra, D.F.; Lugão, Ademar B.; Chinelatto, Marcelo Aparecido; Canevarolo, Sebastião V.

doi:10.1016/j.radphyschem.2009.11.003

Cited by 73 publications

(34 citation statements)

References 14 publications

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“…[5]- [7]. Among them, the major governing effects observed to alter the structural pattern in polymer films are scissions and cross-linking or joining of chains by formation of bonds [8] [9]. The scissions and cross-links of the polymers are more easily determined due to its nature.…”

Section: Introductionmentioning

confidence: 99%

Study the Frequency Dependence of Dielectric Properties of Gamma Irradiated PVA(1-x)PSx Polymer Blends

Prabha¹,

Jayanna²

2015

OJPChem

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PVA(1-x)PSx (x = 0.0, 0.25, 0.50, 0.75 and 1.0) polymer blend films were prepared by simple solution cast method using mixer of dimethyl sulphoxide (DMSO) and double distilled water (DDW) as a common solvent. Gamma irradiation studies have been carried out to investigate the potential for improvements in the electrical properties of pure and blend polymer film. The induced changes in the dielectric constant (εr), dielectric loss (tanδ) and AC conductivity (σac) properties for the unirradiated and irradiated films were studied, in the frequency range 50 Hz -5 MHz at room temperature (27˚C). Further, it was seen that the frequency dependent dielectric constant, dielectric loss and AC conductivity were found to increase with increasing γ irradiation dose for all the PVA(1-x)PSx (x = 0.0, 0.25, 0.50, 0.75 and 1.0) polymer blends. The maximum σac at 1 kHz frequency was observed to be 2.4421 × 10 −6 s/m (at room temperature) for PVA film irradiated at 1.5 kGy.

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Section: Introductionmentioning

confidence: 99%

Study the Frequency Dependence of Dielectric Properties of Gamma Irradiated PVA(1-x)PSx Polymer Blends

Prabha¹,

Jayanna²

2015

OJPChem

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“…The degradation process of polypropylene exposed to gamma radiation dose from 5 to 100 kGy under inert atmosphere reveals mechanisms of chain scission and chain branching [6]. In the radiation process the loose ends of broken chains created, in the aftermath of multi-ionization spurs, in polypropylene results in the reduction of average molecular weight, while in polyethylene can form crosslinked structures with neighboring chains.…”

Section: Introductionmentioning

confidence: 99%

AgNPs polypropylene gel films–thermal study and antibacterial activity

Oliani

Lima

Rogero

et al. 2015

J Therm Anal Calorim

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In this work, antibacterial activity was investigated in polypropylene gel containing silver nanoparticles (AgNPs). The PP was modified by crosslink under gamma radiation process of pristine PP, in acetylene atmosphere and dose of 12.5 kGy, followed by thermal treatment. The thin films of the polypropylene gel (AgNPs-GelPP) were obtained by extraction in boiling xylene for period of 12 h at 138°C, followed by decantation at room temperature of 25°C. The films of AgNPs-GelPP were characterized using scanning electron microscopy, energy-dispersive spectroscopy, transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and X-ray diffraction. Cytotoxicity tests and reduction of the colony forming number unit were performed in the films. Efficiency of the silver nanoparticles on antibacterial activity was evaluated and analyzed versus DSC. The results showed that crystallinity cooperates to bactericidal effect.

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“…Otaguro et al studied the degradation of high molecular weight iPP subjected to gamma radiation exposure up to 100 kGy in an inert atmosphere. 11 In their study, they observed that at low irradiation doses (below 12.5 kGy) the chain scission was the preferential process. As the dose level was increased above 12.5 kGy, the cross-linking predominated.…”

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confidence: 97%

Impact of Swift Heavy Ions and Gamma Radiation upon Optical, Structural, and Chemical Properties of Polypropylene Polymer Films

Gupta

Singh

et al. 2015

Adv Polym Technol

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ABSTRACT:The present work focuses on the effects of two different ions (70 MeV carbon and 50 MeV lithium) and gamma radiation upon the structural, optical, and chemical properties of 125-μm thick polypropylene (PP) polymer films. The different samples of PP were irradiated with ions to the fluences in the range 10 11 -10 13 ions/cm 2 and exposed to gamma radiation of doses in the range 100-1250 kGy. A comparative study is carried out upon different parameters of irradiated polymer samples such as crystallite size and band gap energy. The structural properties are effectively modified by the ions irradiation, whereas gamma exposure shows insignificant changes in this regard; however, gamma exposure is observed to be effective in gradually decreasing the band gap energy of the PP samples with an increase in the gamma dose. The formation of new chemical bands is observed in the ion-irradiated and gamma-exposed PP polymer samples. C 2015 Wiley Periodicals, Inc. Adv Polym Technol 2015; View this article online at wileyonlinelibrary.com.

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High-energy radiation forming chain scission and branching in polypropylene

Cited by 73 publications

References 14 publications

Study the Frequency Dependence of Dielectric Properties of Gamma Irradiated PVA<sub>(1-x)</sub>PS<sub>x</sub> Polymer Blends

Study the Frequency Dependence of Dielectric Properties of Gamma Irradiated PVA<sub>(1-x)</sub>PS<sub>x</sub> Polymer Blends

AgNPs polypropylene gel films–thermal study and antibacterial activity

Impact of Swift Heavy Ions and Gamma Radiation upon Optical, Structural, and Chemical Properties of Polypropylene Polymer Films

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High-energy radiation forming chain scission and branching in polypropylene

Cited by 73 publications

References 14 publications

Study the Frequency Dependence of Dielectric Properties of Gamma Irradiated PVA&lt;sub&gt;(1-x)&lt;/sub&gt;PS&lt;sub&gt;x&lt;/sub&gt; Polymer Blends

Study the Frequency Dependence of Dielectric Properties of Gamma Irradiated PVA&lt;sub&gt;(1-x)&lt;/sub&gt;PS&lt;sub&gt;x&lt;/sub&gt; Polymer Blends

AgNPs polypropylene gel films–thermal study and antibacterial activity

Impact of Swift Heavy Ions and Gamma Radiation upon Optical, Structural, and Chemical Properties of Polypropylene Polymer Films

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Product

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Study the Frequency Dependence of Dielectric Properties of Gamma Irradiated PVA<sub>(1-x)</sub>PS<sub>x</sub> Polymer Blends

Study the Frequency Dependence of Dielectric Properties of Gamma Irradiated PVA<sub>(1-x)</sub>PS<sub>x</sub> Polymer Blends