Melt Index
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Influence of mixing methods on the properties of high density polyethylene nanocomposites with different carbon nanoparticles
ABSTRACT In this paper, nanocomposites with multiwalled carbon nanotubes (MWCNT) or graphene nanosheets were prepared using a high density polyethylene (HDPE) matrix. Two different processes were employed: a solution method and a melt mixing method. The crystallinity index of the HDPE showed similar levels in nanocomposites after the addition of carbon nanot
Matéria (Rio J.). Publicado em: 02/10/2017
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2. Biobased additive plasticizing Polylactic acid (PLA)
Polylactic acid (PLA) is an attractive candidate for replacing petrochemical polymers because it is from renewable resources. In this study, a specific PLA 2002D was melt-mixed with two plasticizers: triethyl citrate (TEC) and acetyl tributyl citrate (ATBC). The plasticized PLA with various concentrations were analyzed by differential scanning calorimetry (D
Polímeros. Publicado em: 2015-12
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3. Effect of Weathering and Accelerated Photoaging on PET/PC (80/20 wt/wt%) Melt Extruded Blend
In this study we investigated the natural weathering of a catalyzed blend of poly(ethylene terephthalate)/polycarbonate PET/PC (80/20wt/wt%). The results were compared to the accelerated photoaging tests. The specimens were characterized by wide angle X-ray diffraction (WAXD), optical microscopy (OM), thermogravimetry (TG/DTG), medium infrared spectroscopy (
Mat. Res.. Publicado em: 25/08/2015
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4. Flexible thermoplastic composite of Polyvinyl Butyral (PVB) and waste of rigid Polyurethane foam
This study reports the preparation and characterization of composites with recycled poly(vinyl butyral) (PVB) and residue of rigid polyurethane foam (PUr), with PUr contents of 20, 35 and 50 wt %, using an extruder equipped with a Maillefer single screw and injection molding. The components of the composites were thermally characterized using differential sc
Polímeros. Publicado em: 2015-04
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5. Rheological and mechanical characterization of poly (methyl methacrylate)/silica (PMMA/SiO2) composites
The search for new materials with properties suitable for specific applications has increased the number of research studies to fill the market demands. The development of polymer composites by the addition of inorganic fillers to the poly(methyl methacrylate) (PMMA) increases the potential use of this polymer in various application fields. The main objectiv
Mat. Res.. Publicado em: 01/08/2014
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6. The effects of weathering exposure on the physical, mechanical, and thermal properties of high-density polyethylene and poly (vinyl chloride)
This paper presents results describing the physical, mechanical, and thermal properties (melt flow index - MFI and oxidative induction time - OIT) of high density polyethylene and poly (vinyl chloride) after weathering exposure (6, 12, 18, and 30 months). The materials exposed were geomembranes of two thicknesses: 1.0 and 2.0 mm (PVC) and 0.8 and 2.5 mm (HDP
Mat. Res.. Publicado em: 20/08/2013
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7. The influence of the industrial processing on the degradation of poly(hidroxybutyrate) - PHB
PHB was characterized after different industrial processes by Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FTIR), Melt Flow Index (MFI), Complex Dielectric Relaxation (CDR) and Size Exclusion Chromatography (SEC). Some properties of PHB were investigated before and after processing, in order to understand how temperature
Mat. Res.. Publicado em: 18/12/2012
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8. Polylactide/Biopolyethylene bioblends
In this work, Polylactide/Biopolyethylene blends were developed. Although some studies have been carried out on polylactide/polyethylene blends, none of them has used polyethylene synthesized with raw material obtained from natural sources. Due to the incompatibility between polylactide and polyethylene, E-GMA and EMA-GMA compatibilizers were used. These com
Polímeros. Publicado em: 09/11/2012
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9. Efeito da irradiação por feixe de elétrons sobre as propriedades físicas e químicas de uma resina de polipropileno. / Effect of electron beam irradiation by on the physical and chemical properties of a resin polypropylene.
A polypropylene resin was modified in the present work by submitting standard tensile specimens to electron beam irradiation, with doses corresponding to 20, 40, 60, 100, 200 and 300kGy. The effect of this irradiation upon the polymer\ s chemical and physical properties was investigated, in particular seeking a possible correlation between these properties a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2011
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10. Parameter estimation for LLDPE gas-phase reactor models
Product development and advanced control applications require models with good predictive capability. However, in some cases it is not possible to obtain good quality phenomenological models due to the lack of data or the presence of important unmeasured effects. The use of empirical models requires less investment in modeling, but implies the need for large
Publicado em: 2011
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11. Avaliação dos tipos de processamento na descontaminação e na degradação do polipropileno reciclado / Evaluation of types of processing in the decontamination and degradation of recycled polypropylene
Polypropylene is one of the most used polymers worldwide, especially by the disposable packaging industry, causing serious environmental problems. Despite the fact that recycling this polymer has become common in Brazil due to its growing market, there are still some restrictions regarding its use in direct-contact food packaging. Therefore, in order to eval
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/12/2010
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12. Melhoria da resistência no estado fundido do polipropileno através da adição de nanoargilas. / Improvement of melt strenght of polypropylene by the addition of nanoclays.
In this work nanocomposites of polypropylene (PP) were obtained. Three types of PP with melt flow rates of 1,5; 2,2 e 37,9 g/10min (230ºC/216kg) were used. The PP with the largest melt flow rate is a product modified with peroxide. These samples were mixed with PP masterbatch Nanocor nanoMax ®-PP. Masterbatch in different concentrations ranging from 3 to 1
Publicado em: 2010