Structure and mechanical properties of isotactic polypropylene and iPP/talc blends functionalized by electron beam irradiation

Lu, Deping; Guan, Rong

doi:10.1002/1097-0126(200011)49:11<1389::aid-pi503>3.0.co;2-4

Cited by 30 publications

(28 citation statements)

References 18 publications

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“…This result might have been related to residual stresses in the material caused by the low mold temperature and the low melt temperature of injection, considering the relatively low thickness of the sample (1 mm). A sharp decrease of elongation at break after e-beam treatment was consistent with findings in the literature (Phillips and Burnay, 1991;Lu and Guan, 2000;Pawde and Parab, 2011). This could be attributed to a radiation induced chain scission process in the PP matrix.…”

Section: Resultssupporting

confidence: 91%

“…The irradiation of injected PP sheets led to a brittle material, with a maximum elongation at break of around 10%, while the elongation at break of the virgin PP M was around 156%. These values, and particularly that of the virgin PP M , were low when compared with values found in the literature (Lu and Guan, 2000). This result might have been related to residual stresses in the material caused by the low mold temperature and the low melt temperature of injection, considering the relatively low thickness of the sample (1 mm).…”

Section: Resultscontrasting

confidence: 57%

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Design of modified plastic surfaces for antimicrobial applications: Impact of ionizing radiation on the physical and mechanical properties of polypropylene

Riquet

Delattre

Vitrac

et al. 2013

Radiation Physics and Chemistry

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Surface modification of polypropylene (PP) sheets was carried out by radiation induced graft polymerization of hydrophilic functional molecules such as N,N-dimethylacrylamide (DMA) and [2-methacryloyloxy)ethyl] trimethylammonium chloride, which is a quaternary ammonium salt (QAS). Polypropylene sheets were activated prior to the grafting reaction by using electron beam radiation. The changes in morphology, crystallinity and tensile parameters like deformation and stress at yield and deformation at break of PP after irradiation were investigated. The results showed that a minor crystalline reorganization takes place during the irradiation of PP at 100 kGy.The grafting has been observed to be strongly dependent on the monomer dilution in the reaction medium. After grafting of QAS (40%) and DMA (20%) it was possible to develop highly hydrophilic surfaces (water contact angle comprised between 30 and 411). The surfaces of virgin, irradiated and grafted PP were studied using polarized optical microscopy (POM) and scanning electron microscopy (SEM). Spherical particles (i.e. polystyrene or silica beads) adhering to the modified samples were studied according to the surface parameters. Adhesion tests confirmed the strong influence of substrate type (mainly hydrophilicity and roughness) and to a lesser extent underlined the role of electrostatic interactions for the design of plastic surfaces for antimicrobial applications.

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Section: Resultssupporting

confidence: 91%

Section: Resultscontrasting

confidence: 57%

Design of modified plastic surfaces for antimicrobial applications: Impact of ionizing radiation on the physical and mechanical properties of polypropylene

Riquet

Delattre

Vitrac

et al. 2013

Radiation Physics and Chemistry

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show abstract

“…Compared with those of HDPE, the T onset and T peak of the uvHDPE decreased because of entity of the crystal lattice defects formed in process of the functionalization of HDPE [18]. With increasing the irradiation time, the crystallinity of the uvHDPE decreased because of the breakage of crystals in process of the functionalization.…”

Section: Dsc Analysis Of Uvhdpementioning

confidence: 94%

Studies on fast functionalization of HDPE by ultraviolet irradiation and functionalized HDPE/CaCO3 composites

Lü

et al. 2011

Polym. Bull.

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High density polyethylene (HDPE) was functionalized quickly by ultraviolet irradiated in ozone atmosphere. The oxygen-containing groups in the functionalized HDPE were C=O and C-O, and their content increased with increasing the irradiation time. The molecular weight of the functionalized HDPE decreased and its distribution became wider with increasing the irradiation time. The gel was not found in the functionalized HDPE. Compared with those of HDPE, the melting temperature and crystallinity of the functionalized HDPE decreased. With increasing the irradiation time, the hydrophilicity of the functionalized HDPE was enhanced, while its temperature of thermal decomposition decreased. The functionalized HDPE/CaCO 3 composites were prepared. Compared with those of HDPE/CaCO 3 composites, the compatibility and dispersion of the functionalized HDPE/CaCO 3 composites were enhanced observably. The tensile strength and notch impact strength of the functionalized HDPE/CaCO 3 composites increased with increasing the irradiation time.

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“…A sharp decrease of elongation at break after electron-beam treatment was consistent with findings in scientific literature (Lu & Guan, 2000;Pawde & Parab, 2011).…”

Section: Structural Variations Induced By Different Physical Treatmentsmentioning

confidence: 99%

The consequences of physical post-treatments (microwave and electron-beam) on food/packaging interactions: A physicochemical and toxicological approach

Riquet

Breysse²,

Dahbi

et al. 2016

Food Chemistry

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a b s t r a c tThe safety of microwave and electron-beam treatments has been demonstrated, in regards to the formation of reaction products that could endanger human health. An integrated approach was used combining the potential toxicity of all the substances likely to migrate to their chemical characterizations. This approach was applied to polypropylene (PP) films prepared with a selection of additives. Components were identified by liquid and gas chromatography using a mass selective detector system. Their potential toxicity was assessed using three in vitro short-term bioassays and their migrations were carried out using a standards-based approach. After the electron-beam treatment some additives decomposed and there was a significant increase in the polyolefin oligomeric saturated hydrocarbons concentration. PP prepared with Irgafos 168 led to a significantly strong cytotoxic effect and PP prepared with Irganox 1076 induced a dose-dependant estrogenic effect in vitro. Migration values were low and below the detection limit of the analytical method applied.

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Structure and mechanical properties of isotactic polypropylene and iPP/talc blends functionalized by electron beam irradiation

Cited by 30 publications

References 18 publications

Design of modified plastic surfaces for antimicrobial applications: Impact of ionizing radiation on the physical and mechanical properties of polypropylene

Design of modified plastic surfaces for antimicrobial applications: Impact of ionizing radiation on the physical and mechanical properties of polypropylene

Studies on fast functionalization of HDPE by ultraviolet irradiation and functionalized HDPE/CaCO3 composites

The consequences of physical post-treatments (microwave and electron-beam) on food/packaging interactions: A physicochemical and toxicological approach

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