Relevant bibliographies by topics / Polypropylene blends; Gamma radiation

Academic literature on the topic 'Polypropylene blends; Gamma radiation'

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Published: 6 September 2023

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Journal articles on the topic "Polypropylene blends; Gamma radiation"

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Sirin, Mehtap, Mehmet Sadrettin Zeybek, Kamil Sirin, and Yüksel Abali. "Effect of gamma irradiation on the thermal and mechanical behaviour of polypropylene and polyethylene blends." Radiation Physics and Chemistry 194 (May 2022): 110034. http://dx.doi.org/10.1016/j.radphyschem.2022.110034.

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Wang, Wenzhao, Xiaochao Zhang, Zongyuan Mao, and Weiquan Zhao. "Effects of gamma radiation on the impact strength of polypropylene (PP)/high density polyethylene (HDPE) blends." Results in Physics 12 (March 2019): 2169–74. http://dx.doi.org/10.1016/j.rinp.2019.02.020.

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Perera, R., C. Albano, J. González, P. Silva, and M. Ichazo. "The effect of gamma radiation on the properties of polypropylene blends with styrene–butadiene–styrene copolymers." Polymer Degradation and Stability 85, no. 2 (August 2004): 741–50. http://dx.doi.org/10.1016/j.polymdegradstab.2003.09.020.

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Dewi, Rozanna, Novi Sylvia, and Zulnazri Zulnazri. "The Effect of Radiation Technology on Surface Morphology of Sago Based Eco-friendly Plastic." Proceedings of Malikussaleh International Conference on Multidisciplinary Studies (MICoMS) 3 (December 17, 2022): 00003. http://dx.doi.org/10.29103/micoms.v3i.41.

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The variety and production continue of plastic has increased and it has brought difficulties in dealing with plastic waste disposed to nature and cannot be decomposed in a long time. Modified thermoplastic starch derived from sago palm crosslinked with polyurethane prepolymer obtained from diphenyl methane diisocyanate and castor oil polyol had better mechanical, thermal and chemical characteristics than bioplastics. In this study, eco-friendly plastics from sago starch modified with prepolymer polyurethane with the addition of chitosan as additive and polypropylene or polyethylene as matrix was produced. The research method conducted were consisting of several stages, preparation of thermoplastic starch, blending thermoplastic starch with polypropylene or polyethylene and plastic irradiation technology using gamma rays with dosage of 5, 10 and 20 kilogray (kGy). The effect of radiation technology on surface morphology of sago based eco-friendly plastic was analysed through Scanning Electron Microscopy (SEM) analysis to observe the effect of gamma rays exposure to the plastic surface. The result showed that the dots appearance on the surface and possibly shown non-uniformity of plastic surface due to less homogeneity of mixture when stirred. Thermoplastic starch was not blended perfectly into PP and this could be due to high temperature different required to melt PP while thermoplastic starch as an organic material cannot stand high temperature and become scorched at high temperature. To overcome this problem, mixing time should be increased to ensure high homogeneity. Overall, SEM analysis showed radiation does not provide effect to plastic surface morphology, which means it did not ruin the polymer structure as well as its binding. Similar appearance observed on the plastic surface morphology before and after radiation, even with highest radiation dose. From the analysis, it can be stated that radiation technology does not influence plastic surface structure, hence plastic binding was remain the same
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Djiporovic-Momcilovic, Milanka. "The influence of irradiated wood filler on some properties of polypropylene - wood composites." Bulletin of the Faculty of Forestry, no. 95 (2007): 73–82. http://dx.doi.org/10.2298/gsf0795073d.

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The problem of compatibility between the wood filler and thermoplastic matrix is of essential importance in composite production. Numerous methods have been developed for increasing this compatibility, which is still representing a challenging objective of composite research throughout the world. The research into these methods is primarily directed towards their efficiency from the viewpoint of the composite performance and their economical acceptability. The latter is of particular importance for the composite production in the developing countries with respect to the shortage of the corresponding funds. With this respect, the utilization of ionizing radiation might have considerable advantages. In this research, the beech wood flour was irradiated by a dose of 10 kGy of 60Co gamma rays for purpose of provoking the changes by the ionizing effect. The effects of ionizing radiation upon the properties of wood particles have been examined by IR spectroscopy and by determination of contents of hydroxyl groups in wood by acetylating as an indirect method. All these methods have been expected to reveal the chemical effects of the applied radiation treatment. The irradiated and the control wood flour were used in order to produce the samples of composite with polypropylene. The polypropylene-wood flour (PP-WF) composites were produced with 40% of wood particles having fraction size 0.3 mm. The melt-blended composites were modified with amido-acrylic acid (AMACA) as a new coupling agent synthesized for this propose in amount of 6 wt.% (based on wood filler) and successively with 0.05 wt.% (based on PP) of organic peroxide during mixing step. The composites containing coupling agents showed superior mechanical properties, compared to the untreated one. The highest extent of improvement of tensile was achieved in PP-WFl composites modified with AMACA coupling agent.
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Hassan Rezk, A. M., M. M. Senna, and E. M. Abdel-Bary. "Gamma-radiation stabilization of polypropylene." Polymer International 28, no. 4 (1992): 265–70. http://dx.doi.org/10.1002/pi.4990280404.

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Yoshiga, Adriana, Harumi Otaguro, Luís Filipe C. P. Lima, Beatriz W. H. Artel, Duclerc F. Parra, Jeferson Rodrigues Bueno, Rodrigo Shinzato, Marcelo Farrah, and Ademar B. Lugão. "Study of polypropylene/polybutene blends modified by gamma irradiation and (high melt strength polypropylene)/polybutene blends." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 265, no. 1 (December 2007): 130–34. http://dx.doi.org/10.1016/j.nimb.2007.08.038.

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Chaudhari, C. V., K. A. Dubey, Y. K. Bhardwaj, G. Naxane, K. S. S. Sarma, and S. Sabharwal. "Effect of electron beam radiation on the polypropylene/polyethylene blends: Radiation stabilization of polypropylene." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 263, no. 2 (October 2007): 451–57. http://dx.doi.org/10.1016/j.nimb.2007.06.027.

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Balaji, Ananad Bellam, Chantara Thevy Ratnam, Mohammad Khalid, and Rashmi Walvekar. "E-beam sterilizable thermoplastics elastomers for healthcare devices: Mechanical, morphology, and in vivo studies." Journal of Biomaterials Applications 32, no. 8 (January 3, 2018): 1049–62. http://dx.doi.org/10.1177/0885328217750476.

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The effect of electron beam radiation on ethylene–propylene diene terpolymer/polypropylene blends is studied as an attempt to develop radiation sterilizable polypropylene/ethylene–propylene diene terpolymer blends suitable for medical devices. The polypropylene/ethylene–propylene diene terpolymer blends with mixing ratios of 80/20, 50/50, 20/80 were prepared in an internal mixer at 165°C and a rotor speed of 50 rpm/min followed by compression molding. The blends and the individual components were radiated using 3.0 MeV electron beam accelerator at doses ranging from 0 to 100 kGy in air and room temperature. All the samples were tested for tensile strength, elongation at break, hardness, impact strength, and morphological properties. After exposing to 25 and 100 kGy radiation doses, 50% PP blend was selected for in vivo studies. Results revealed that radiation-induced crosslinking is dominating in EPDM dominant blends, while radiation-induced degradation is prevailing in PP dominant blends. The 20% PP blend was found to be most compatible for 20–60 kGy radiation sterilization. The retention in impact strength with enhanced tensile strength of 20% PP blend at 20–60 kGy believed to be associated with increased compatibility between PP and EPDM along with the radiation-induced crosslinking. The scanning electron micrographs of the fracture surfaces of the PP/EPDM blends showed evidences consistent with the above contentation. The in vivo studies provide an instinct that the radiated blends are safe to be used for healthcare devices.
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Li, Min, Li Guang Xiao, and Hong Kai Zhao. "Effect of Electron Beam Irradiation on the Polypropylene/Syndiotactic 1,2-Polybutadiene Blends: Radiation Stabilization of Polypropylene." Advanced Materials Research 581-582 (October 2012): 627–31. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.627.

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The effect of electron beam irradiation on polypropylene (PP), syndiotactic 1,2-polybutadiene (sPB) and their blends were studied. They were irradiated with the doses of 20 kGy, 60 kGy, 80 kGy and 100 kGy. Scanning electron microscopy and mechanical test were carried out to characterize the irradiated samples. When PP/sPB blends were irradiated, a part of PP macroradicals created by irradiation acts either as crosslinking agent making the PP and sPB crosslink or it is grafted onto sPB in the interface, which results in the interfacial adhesion stronger between PP and sPB compared with unirradiated PP/sPB blends. Significant improvement of mechanical properties has been obtained by the addition of sPB in the PP matrix when irradiated. The presence of sPB obviously decreases the PP sensitivity to radiation effects.
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Dissertations / Theses on the topic "Polypropylene blends; Gamma radiation"

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CARDOSO, ELISABETH C. L. "Desenvolvimento de espumas a partir de misturas polimericas de polipropileno linear (PP) e polipropileno de alta resistencia do fundido (HMSPP)." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9485.

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IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Moori, Tatiana Mayumi. "Desenvolvimento e caracterização de blendas de polipropileno e polietileno modificadas por radiação gama." Universidade Presbiteriana Mackenzie, 2014. http://tede.mackenzie.br/jspui/handle/tede/1340.

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IPEN - Instituto de Pesquisas Energéticas e Nucleares
In the polymer industry the blends have become an interesting alternative to the technological field, therefore, added different properties in a shorter period of polymers developing. The high consumption and low cost of polyolefins, PP and PE, were responsible for the growing interest in many researches, aimed to improve the limitations of the PP. In addition, new needs for future interests emerged elimination of matter, since these two components are the main constituents of domestic waste and plastics recycling. The immiscibility of PP and PE has been discussed, according to the method used, the system may or may not be homogeneous. The γ radiation results in the formation of very reactive intermediate elements, which, applied to the blend compatibility component influences some properties and benefits. The objective of this study was characterize the blends of PP/LDPE and PP/HDPE with different concentrations, investigating the best combination of polymers before and after γ radiation. The material was irradiated with doses of 30kGy, 50kGy, 100kGy and 200kGy, at a fixed rate of 11.6 kGy/h and subsequently performed the tests of mechanical and thermomechanical resistance in order to observe its effects. It concluded that the changes were directly related to the factors: dose and concentration. For each type of combined, there was a specific result. The ionizing radiation change the compatibility of the components, promoting some properties of the blends, showing strong and economical materials.
No setor polimérico as blendas passaram a ser uma interessante alternativa para o campo tecnológico, pois, agregaram propriedades de polímeros distintos em um menor prazo de desenvolvimento. O alto consumo e baixo custo das poliolefinas, PP e PE, foram responsáveis pelo crescente interesse em diversas pesquisas, almejando melhoria as limitações do PP. Além disso, novos interesses surgiram pelas necessidades futuras de eliminação da matéria, uma vez que estes dois componentes são os principais constituintes dos resíduos domésticos de plástico e de reciclagem. A imiscibilidade do PP e PE foi bastante discutida, pois, de acordo com o método de ensaio utilizado, o sistema pode ou não ser homogêneo. A radiação γ proporciona a formação de elementos intermediários muito reativos, do qual, aplicadas nas blendas influencia na compatibilidade dos componentes e beneficia algumas propriedades. Assim, o objetivo desse trabalho foi caracterizar as blendas de PP/PEBD e PP/PEAD com diferentes concentrações, investigando a melhor combinação dos polímeros antes e após a radiação γ. O material foi irradiado com doses de 30kGy; 50kGy; 100kGy e 200kGy, numa taxa fixa de 11,6 kGy/h e, posteriormente, realizou ensaios de resistência mecânica e termomecânica a fim de observar seus efeitos. Concluiu-se que as modificações ocorridas estavam, diretamente relacionadas aos fatores: dose e concentração. Para cada tipo de combinação observou-se um resultado específico. A radiação ionizante alterou a compatibilidade dos componentes, favorecendo algumas propriedades das blendas, revelando materiais resistentes e de baixo custo.
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CARDOSO, ELISABETH C. L. "Desenvolvimento de espumas parcialmente biodegradáveis a partir de blendas de PP/HMSPP com polímeros naturais e sintéticos." reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10635.

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Tese (Doutorado em Tecnologia Nuclear)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Ruiz, Francisco Carlos. "Efeito da radiação gama na blenda de polipropileno e polietileno destinada à produção de artigos obtidos por processo de termoformagem, moldagem por injeção e moldagem por sopro." Universidade Presbiteriana Mackenzie, 2009. http://tede.mackenzie.br/jspui/handle/tede/1375.

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Fundo Mackenzie de Pesquisa
The effect of the incorporating 20% of polyethylene with 80% of polypropylene was investigated. The main objective was to study the mechanical behavior of these blends when submitted to different doses of radiation between 25 and 500kGy, in the presence of oxygen and also facing the influence of time. Sample tests were obtained by injection molding using pure polypropylene and two different kinds of polyethylene in each blend: linear low density polyethylene and high density polyethylene. In the mechanical tests it was evaluated the resistance to the Izod impact, flexural modulus, tension resistance and deformations. Analyses of differential scanning calorimetry, infrared spectroscopy and nuclear magnetic resonance were used to help in the understanding the generation of reactive species in the polymers. Although all the samples presented the same tendency in each essay, significant differences were visualized in the resistance to the Izod impact, where the blends presented a less accentuated lose of this mechanical property, 25% in 26kGy dose of radiation, than the pure polypropylene, which lost 65% in the same dose. The behavior of stiffness for all of the samples was very similar, indicating an increase of the crystalline domain that was also verified by thermal analyses and by an increase in the yield stress during the stress-strain test. In the stress of rupture visualizes itself the crosslinking effect of the molecular chains mainly at highest doses of radiation, 200 and 500kGy. This result was also verified by nuclear magnetic resonance analysis which indicated a reduction in the molecular mobility of the linear low density polyethylene blends. Those results showed that both blends presented a better behavior facing the ionizing radiations than the pure polymer, having practical application in the polymers transformation industry.
O efeito da incorporação de 20% de polietileno com 80% de polipropileno foi investigado com o objetivo de estudar o comportamento mecânico da blenda quando submetida à diferentes doses de radiação gama, entre 25 e 500kGy, na presença de oxigênio e também seu efeito frente ao tempo de estocagem do material ao abrigo da luz. Corpos de prova foram obtidos via moldagem por injeção utilizando polipropileno puro e dois tipos de polietileno em cada blenda: polietileno linear de baixa densidade e polietileno de alta densidade, sendo avaliada a resistência ao impacto Izod, módulo de flexão e tensões e deformações no ensaio de tração. Análises de calorimetria exploratória diferencial, espectroscopia na região do infravermelho e ressonância magnética nuclear foram utilizadas para contribuir no entendimento do processo de geração de espécies reativas nos polímeros. Muito embora todas as amostras apresentaram a mesma tendência de comportamento em cada ensaio, diferenças significativas foram visualizadas na resistência ao impacto Izod, onde as blendas mostraram degeneração menos acentuada, 25% em dose de radiação de 26kGy, do que o polipropileno puro que perdeu 65% dessa propriedade em 26kGy. O comportamento de rigidez para todos os materiais foi muito semelhante, indicando um aumento de cristalinidade que foi comprovado pelas análises de calor de fusão e aumento na tensão no escoamento durante o teste de tração. Na tensão na ruptura visualiza-se o efeito da reticulação das cadeias moleculares principalmente nas maiores doses de radiação gama, 200 e 500kGy, também comprovado pela análise de ressonância magnética nuclear indicando uma menor mobilidade molecular alcançanda pela blenda com polietileno linear de baixa densidade. Com esses resultados alcançados, as blendas apresentam um melhor comportamento frente à radiação ionizante do que o polímero puro, tendo aplicações práticas na indústria de transformação de polímeros.
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OLIANI, WASHINGTON L. "Estudo do comportamento de HMS-SP (Polipropileno com alta resistencia do fundido) sob condicoes de degradacao ambiental e acelerada." reponame:Repositório Institucional do IPEN, 2008. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11773.

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Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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OLIANI, WASHINGTON L. "Estudo da formação de nanogéis e microgéis de polipropileno modificado por radiação gama e incorporação de nanopartículas de prata visando à ação biocida." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/23491.

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Tese (Doutorado em Tecnologia Nuclear)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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LUGAO, ADEMAR B. "Estudos da sintese por irradiacao, da estrutura e do mecanismo de formacao de polipropileno com alta resistencia do fundido." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11212.

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IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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KOMATSU, LUIZ G. H. "Estudo comparativo de nanocompósitos de polipropileno modificado sob condições de envelhecimento ambiental e acelerado." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26380.

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IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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ROMANO, REBECA da S. G. "Estudo da irradiação do polipropileno para possibilitar o controle de sua degradação ambiental." reponame:Repositório Institucional do IPEN, 2017. http://repositorio.ipen.br:8080/xmlui/handle/123456789/28012.

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O PP é descartado em grande quantidade no meio ambiente, tendo em vista seu consumo muito elevado derivado de suas excelentes propriedades químicas e físicas, boa processabilidade e baixo custo. As radiações ionizantes, não ionizantes (UV e infravermelho), bem como o oxigênio e os poluentes podem causar a degradação do polipropileno (PP). A exposição à radiação ionizante pode causar na molécula de PP cisão de cadeia principal, reticulação e peroxidação (na presença de ar) entre outras. Este estudo tem como objetivo, o desenvolvimento de um PP oxidegradável por meio do controle da degradação induzida por radiação ionizante. As amostras foram processadas por injeção e expostas ao envelhecimento natural durante 180 dias e ao envelhecimento acelerado em estufa á 100°C por 192 dias e depois caracterizadas por avaliação visual, ensaios mecânicos, FTIR, SEM, DSC, TGA e DRX. As amostras de PP Grão 20 kGy, após o envelhecimento natural, apresentaram maior oxidação com presença de fissuras superficiais mais intensamente do que o PP d2w®. A resistência a tração do PP irradiado foi superior ao PP d2w® e os resultados do alongamento na ruptura mostraram uma diminuição intensa se compararmos o PP irradiado e o PP d2w® com o PP. Após a exposição natural espécies os índices de vinila e carbonila aumentaram ligeiramente devido as reações Norrish. O grupo carbonila promove uma oxidação contínua, junto à superfície fazendo com que o polímero diminua sua massa molar. O efeito da degradação natural foi evidente na ordem PP Grão 20 kGy > PP Grão 12,5 kGy = PP d2w® > PP. Por conseguinte, este conceito pode ser utilizado para produzir um PP com propriedades oxi-degradáveis de uma forma controlável.
Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
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Heeley, E. L., Timothy D. Gough, D. J. Hughes, W. Bras, J. Rieger, and A. J. Ryan. "Effect of processing parameters on the morphology development during extrusion of polyethylene tape: An in-line small-angle X-ray scattering (SAXS) study." 2013. http://hdl.handle.net/10454/9663.

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The in-line development of crystalline morphology and orientation during melt extrusion of low density polyethylene (LDPE) tape at nil and low haul-off speeds has been investigated using Small-Angle X-Ray Scattering (SAXS). The processing parameters, namely haul-off speed and distance down the tape-line have been varied and the resulting crystalline morphology is described from detailed analysis of the SAXS data. Increasing haul-off speed increased orientation in the polymer tape and the resulting morphology could be described in terms of regular lamellar stacking perpendicular to the elongation direction. In contrast, under nil haul-off conditions the tape still showed some orientation down the tape-line, but a shish-kebab structure prevails. The final lamellae thickness (similar to 50 angstrom) and bulk crystallinity (similar to 20%), were low at, for all processing conditions investigated, which is attributed to the significant short-chain branching in the polymer acting as point defects limiting lamellae crystal growth. (C) 2013 Elsevier Ltd. All rights reserved.
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Book chapters on the topic "Polypropylene blends; Gamma radiation"

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Oliani, Washington Luiz, Luiz Gustavo Hiroki Komatsu, Ademar Benevolo Lugao, Vijaya Kumar Rangari, and Duclerc Fernandes Parra. "Natural Aging Effects in HMS-Polypropylene Synthesized by Gamma Radiation in Acetylene Atmosphere." In TMS 2016 145th Annual Meeting & Exhibition, 151–58. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48254-5_19.

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Oliani, Washington Luiz, Luiz Gustavo Hiroki Komatsu, Ademar Benevolo Lugao, Vijaya Kumar Rangari, and Duclerc Fernandes Parra. "Natural Aging Effects in HMS-Polypropylene Synthesized by Gamma Radiation in Acetylene Atmosphere." In TMS 2016: 145thAnnual Meeting & Exhibition: Supplemental Proceedings, 151–58. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119274896.ch19.

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Apostolov, Anton A., Ognian Samokovliyski, Stoyko Fakirov, Norbert Stribeck, Zlatan Denchev, Michel Evstatiev, Klaus Friedrich, and Sergio S. Funari. "Transcrystallisation with reorientation of polypropylene in drawn PET/PP and PA66/PP blends. Part 1. Study with WAXS of synchrotron radiation." In Scattering Methods and the Properties of Polymer Materials, 159–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/b107332.

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Abdel Kerim, F. M., A. M. Elagrami, and E. H. El-Kalla. "Study of the Effect of Gamma Radiation on the IR Spectra of Polypropylene." In Isotopenpraxis Band 21, Heft 1, 23–25. De Gruyter, 1985. http://dx.doi.org/10.1515/9783112559123-013.

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Conference papers on the topic "Polypropylene blends; Gamma radiation"

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Mouaci, S., N. Belkahla, N. Saidi-Amroun, and M. Saidi. "The influence of gamma radiation on Electrical behaviour of isotactic polypropylene." In 2013 IEEE International Conference on Solid Dielectrics (ICSD). IEEE, 2013. http://dx.doi.org/10.1109/icsd.2013.6619717.

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Song, Y. N., Meng Xiao, and B. X. Du. "Effect of Gamma Radiation Modification on Crystallization and Breakdown Properties of Polypropylene." In 2022 IEEE 4th International Conference on Dielectrics (ICD). IEEE, 2022. http://dx.doi.org/10.1109/icd53806.2022.9863606.

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3

Xiao, Meng, Y. N. Song, and B. X. Du. "Effect of Gamma Radiation on the High-temperature Breakdown Strength of Polypropylene Films for Capacitors." In 2022 IEEE 4th International Conference on Dielectrics (ICD). IEEE, 2022. http://dx.doi.org/10.1109/icd53806.2022.9863462.

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