Influence of the CaCO<sub>3</sub> nanoparticles on the molecular orientation of the polypropylene matrix

Garcı́a-López, D.; Merino, Juan Carlos; Pastor, J. M.

doi:10.1002/app.12030

Cited by 87 publications

(93 citation statements)

References 18 publications

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“…[51][52][53] On the other hand, there are literature works stating that the presence of nanoparticles can modify the molecular orientation, the crystallization temperature, the crystallization degree, and the crystallization rate of the matrix of a nanocomposite. 54,55 Indeed, it has been reported that gold nanoparticles favor the crystalline orientation of L-alanine crystals preferentially along the c-axes. 56 On the basis of these observations, the scheme shown as inset (I) in Fig.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of silver/alanine nanocomposites for radiation detection in medical applications: the influence of particle size on the detection properties

et al. 2012

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Silver/alanine nanocomposites with varying mass percentage of silver have been produced. The size of the silver nanoparticles seems to drive the formation of the nanocomposite, yielding a homogeneous dispersion of the silver nanoparticles in the alanine matrix or flocs of silver nanoparticles segregated from the alanine crystals. The alanine crystalline orientation is modified according to the particle size of the silver nanoparticles. Concerning a mass percentage of silver below 0.1%, the nanocomposites are homogeneous, and there is no particle aggregation. As the mass percentage of silver is increased, the system becomes unstable, and there is particle flocculation with subsequent segregation of the alanine crystals. The nanocomposites have been analyzed by transmission electron microscopy (TEM), UV-Vis absorption spectroscopy, X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy and they have been tested as radiation detectors by means of electron spin resonance (ESR) spectroscopy in order to detect the paramagnetic centers created by the radiation. In fact, the sensitivity of the radiation detectors is optimized in the case of systems containing small particles (30 nm) that are well dispersed in the alanine matrix. As the agglomeration increases, particle growth (up to 1.5 mm) and segregation diminish the sensitivity. In conclusion, nanostructured materials can be used for optimization of alanine sensitivity, by taking into account the influence of the particles size of the silver nanoparticles on the detection properties of the alanine radiation detectors, thus contributing to the construction of small-sized detectors.

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Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of silver/alanine nanocomposites for radiation detection in medical applications: the influence of particle size on the detection properties

et al. 2012

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“…Este teste é comumente aplicado na caracterização de filmes poliméricos, utilizados no acondicionamento de produtos, que podem estar em contato com pontas, cantos vivos e outros tipos de protuberâncias capazes de danificar a embalagem durante o acondicionamento e a distribuição [7] . Para o ensaio da termossoldagem à tração, filmes de 25 cm de comprimento e 5 cm de largura foram selados, segundo norma ASTM D F88-00, empregando temperatura média de 165 °C e pressão de 3,5 kgf.cm -2 por 0,5 segundos.…”

Section: Preparação Das Amostrasunclassified

“…Estudos sobre nanocompósitos PP/argila organofílica são amplamente divulgados na literatura [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] . Entretanto, o número de publicações sobre filmes de nanocompósitos PP/argila organofílica para aplicação no setor de embalagens alimentícias é limitado [21][22][23] e a literatura tem mostrado que, ao contrário dos nanocompósitos preparados com matrizes polares como poliamidas, poliésteres e policarbonatos, os preparados com matrizes apolares poliolefínicas não tem apresentado melhoramentos significativos nas propriedades mecânicas e de barreira, o que tem sido atribuído a fraca adesão interfacial polímero/argila [20] .…”

Section: Introductionunclassified

Desenvolvimento de filmes de nananocompósitos polipropileno/argila organofílica para embalagens

Araújo¹,

Mesquita²,

Canedo³

et al. 2012

Polímeros

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Resumo: Neste trabalho foram preparados filmes de nanocompósitos de polipropileno (PP) contendo 1% em massa de bentonita modificada organicamente com tecnologia nacional (APO). Polipropileno enxertado com anidrido maleico (PP-g-AM) e copolímero de etileno e álcool vinílico (EVOH) foram utilizados como agentes compatibilizantes. Os nanocompósitos foram preparados através da intercalação no estado fundido em extrusora de filme plano. A influência do tipo e do teor de compatibilizante e do tipo de polipropileno, na morfologia, propriedades mecânicas e de barreira ao vapor d'água dos referidos filmes foi investigada. Os dados de difração de raio X evidenciam que apesar da morfologia dos nanocompósitos ter sido afetada pelo tipo de compatibilizante, esta praticamente não variou com o teor de compatibilizante utilizado. As morfologias e as propriedades de barreira ao vapor d'água dos nanocompósitos preparados com os polipropilenos PP H401 e PP H07D-00 são semelhantes. Entretanto, aqueles preparados com PP H07D-00 apresentaram melhores propriedades mecânicas, excetuando a resistência da termossoldagem à tração, do que os preparados com a matriz polimérica PP H401, e a transparência dos nanocompósitos preparados com PP H07D-00 foi idêntica à da matriz polimérica sem argila. Os resultados indicam que os filmes de nanocompósitos PP H07D-00 compatibilizados com 15% de PP-g-AM e contendo 1% de argila organofílica APO podem ser promissores para aplicação em embalagens. Palavras-chave: Filmes de nanocompósitos, argila organofílica, polipropileno, compatibilizante. Development of Polypropylene/Organoclay Nanocomposite Films for PackagingAbstract: This work deals with polypropylene (PP) nanocomposite films containing 1 wt. (%) bentonite clay organically modified with national technology (APO). Maleic anhydride grafted polypropylene (PP-g-MA) and ethylene vinyl alcohol (EVOH) were used as compatibilizing agents. Nanocomposites were prepared by melt intercalation in a flat film extruder. An investigation was made of the influence from the type and content of compatibilizer and type of polypropylene on the morphology, mechanical properties and barrier properties to water vapor of these films. X-ray diffraction data show that while the nanocomposite morphology was affected by the type of compatibilizer, it was relatively insensitive to its content. The morphologies and barrier properties to water vapor of the nanocomposites prepared with the two polypropylenes (PP H401 and PP H07D-00) were similar. However, except for the heat sealing properties, those prepared with PP H07D-00 showed better mechanical properties. The transparency of P715AMAPO nanocomposite was similar to that of the P715AM matrix. The results indicated that PP H07D-00 nanocomposite films compatibilized with 15% PP-g-AM and containing 1% APO organoclay may be promising for packaging applications. Keywords: Nanocomposite films, organoclay, polypropylene, compatibilizer. IntroduçãoCom o advento dos nanocompósitos poliméricos, as indústrias de embalagens vêm vislumbran...

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“…Therefore, in order to obtain an indication of the size of these larger structures as well as their possible size variation with CN concentration, micro-Raman spectroscopy was employed. Micro-Raman spectroscopy was used in previous studies of polypropylene composites [33] as well as on its nanocomposites to detect the thermal residual strains and chain orientation [34][35][36]. In the present work, 2D…”

Section: Morphological Characterizationmentioning

confidence: 99%

Nanocomposites of isotactic polypropylene with carbon nanoparticles exhibiting enhanced stiffness, thermal stability and gas barrier properties

Vassiliou¹,

Bikiaris²,

Chrissafis³

et al. 2008

Composites Science and Technology

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Stavrev, et al.. Nanocomposites of isotactic polypropylene with carbon nanoparticles exhibiting enhanced stiffness, thermal stability and gas barrier properties. Composites Science and Technology, Elsevier, 2009, 68 (3-4) AbstractCarbon nanoparticles (CN), synthesized by a shock wave propagation method from the free carbon of the explosive, were dispersed in isotactic polypropylene (iPP) using a twin screw corotating extruder. These materials were analyzed for their tensile properties, crystallization morphology, thermal stability under N 2 , O 2 and air, as well as their permeability rates for N 2 , O 2 and CO 2 . Young's modulus was significantly enhanced, as was the tensile strength at the yield point, although at a smaller extent. However, the tensile strength and elongation at the break point slightly deteriorated with the increase of the filler's concentration. This behavior was attributed to the increase tendency of CN to form aggregates into iPP matrix by increasing its content. The size of aggregates, as was evaluated by extended micro-Raman mapping, is ranged from 1 up to 5 m. The nanoparticles caused a significant reduction of the iPP chain's mobility leading to smaller and less ordered crystallites, with the appearance of -phase crystallites at CN content 5 wt%. In inert atmosphere (N 2 ) the presence of the nanoparticles caused a shift of the starting decomposition temperature (T d ), from 368 up to 418.6 o C, while, under oxygen, thermal decomposition was more complex, displaying more than two stages. The T d was slightly lowered, up to a filler content of 2.5 wt%, with the nanoparticles exhibiting a catalytic role at the beginning of the polymer's decomposition. Under air, the degradation behavior was between ACCEPTED MANUSCRIPT 2 those exhibited in inert and O 2 atmospheres. Permeability rates for the gases measured were substantially lowered with increasing filler content.

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Influence of the CaCO₃ nanoparticles on the molecular orientation of the polypropylene matrix

Cited by 87 publications

References 18 publications

Synthesis and characterization of silver/alanine nanocomposites for radiation detection in medical applications: the influence of particle size on the detection properties

Synthesis and characterization of silver/alanine nanocomposites for radiation detection in medical applications: the influence of particle size on the detection properties

Desenvolvimento de filmes de nananocompósitos polipropileno/argila organofílica para embalagens

Nanocomposites of isotactic polypropylene with carbon nanoparticles exhibiting enhanced stiffness, thermal stability and gas barrier properties

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Influence of the CaCO3 nanoparticles on the molecular orientation of the polypropylene matrix

Cited by 87 publications

References 18 publications

Synthesis and characterization of silver/alanine nanocomposites for radiation detection in medical applications: the influence of particle size on the detection properties

Synthesis and characterization of silver/alanine nanocomposites for radiation detection in medical applications: the influence of particle size on the detection properties

Desenvolvimento de filmes de nananocompósitos polipropileno/argila organofílica para embalagens

Nanocomposites of isotactic polypropylene with carbon nanoparticles exhibiting enhanced stiffness, thermal stability and gas barrier properties

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Product

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Influence of the CaCO₃ nanoparticles on the molecular orientation of the polypropylene matrix