Polymeric Blend
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. Use of Copper Microparticles in SEBS/PP Compounds. Part 1: Effects on Morphology, Thermal, Physical, Mechanical and Antibacterial Properties
An alternative for producing thermoplastic elastomers (TPEs) with antibacterial properties is to add copper to the polymeric matrices. This study investigates the effects of the addition of copper microparticles on the morphological, thermal, physical and mechanical behavior and antibacterial properties of a blend composed by styrene-(ethylene-butylene)-styr
Mat. Res.. Publicado em: 11/02/2019
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2. Experimental comparative study of the histotoxicity of poly(lactic-co-glycolic acid) copolymer and poly(lactic-co-glycolic acid)-poly(isoprene) blend
Current treatments of craniosynostosis rely on the application of metal springs for cranial bone deviation. However, those metal springs demand a second surgical procedure for their removal. An attractive alternative would be the substitution of metal for bioresorbable polymers in the composition of the springs. The addition of poly(isoprene), PI, to poly(la
Polímeros. Publicado em: 12/09/2014
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3. Analysis of Poly(Lactic-co-Glycolic Acid)/Poly(Isoprene) Polymeric Blend for application as biomaterial
The application of renewable raw materials encourages research in the biopolymers area. The Poly(Lactic-co-Glycolic Acid)/Poly(Isoprene) (PLGA/IR) blend combines biocompatibility for application in the health field with excellent mechanical properties. The blend was obtained by solubilization of polymers in organic solvents. To investigate the polymer thermo
Polímeros. Publicado em: 2013
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4. Análise da influência das condições de processamento na morfologia e nas propriedades de blendas poliméricas PBT/ABS moldadas por injeção
A study on the correlation of blend morphology, properties, the injection molding process and manufacturing methods of polymeric blends constituted of PBT and ABS was proposed. Thus, uncompatibilized PBT/ABS blends have been prepared in a twin-screw extruder using different parameters of process, in order to obtain blends presenting distinct properties and,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/06/2011
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5. Evaluation of photodegradation in LDPE/modified starch blends
Photodegradation of LDPE/modified starch blends 80/20 m/m has been examined by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X ray diffraction (DRX) before and after exposure to ultraviolet radiation (UV). Samples were exposed to UV in the laboratory for periods of 6, 24, 48 and 60 hours. The main alteration in the po
Polímeros. Publicado em: 2009
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6. Estudo da tenacificação do poliestireno com elastômeros butadiênicos / Polystyrene toughening by butadiene elastomers
This Dissertation describes a study about the toughening of polystyrene with different types of polybutadiene (high-cis, low-cis and styrene - butadiene diblock or triblock copolymers). These materials (High Impact of PolyStyrene HIPS) were performed by melt blending. The mechanical properties (hardness, tensile strength and impact strength); morphology and
Publicado em: 2009
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7. Effect of the radiolitic sterilization in polyethylene/starch blends
Samples of LDPE/modified starch blends 80/20 m/m before and after exposure to gamma rays were examined by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction. The effect of gamma radiation is clearly seen in the samples irradiated at a dose of 25 kGy. The main alteration in the polymeric material after exp
Química Nova. Publicado em: 2008
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8. Propriedades dielétricas e térmicas das blendas de poliestireno com ácido oléico e polietireno com betacaroteno / Properties dielétricas and thermal of the blends of polystyrene with oleic acid and polietireno with Beta-Carotene
The thermal, dielectrics and optics properties of vegetable oils have been studied by Amazonian Materials Physic Group since 1996 in the Department of Physic of UFPA. Recently collaboration with Physical-chemistry of polymer Laboratory in the Chemistry Institute of UnB allowed studying these oils and its components as polymeric blends. In this work, we searc
Publicado em: 2008
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9. FotodegradaÃÃo e efeito combinado da radiaÃÃo gama/biodegradaÃÃo em blendas polietileno/amido
The polymeric blends composed by synthetic and natural polymers, as the starch, come deverving prominence in the development of new materials for presenting similar properties to synthetic polymers, and greater easiness of degrading when exposed to microorganisms in the environment, when they are discarded. The current work had for objective to evaluate of t
Publicado em: 2007
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10. Estudo físico-químico de micropartículas compostas por P(HB-HV) e por blendas de P(HB-HV) e PCL contendo fármacos-modelo lipofílicos ionizáveis / Physico-Chemical Study of Microparticles Composed of P(HB-HV) and P(HB-HV)/PCL Blends Loaded with Ionizable Lipophilic Drug-Models
Micropartículas formadas por blendas de P(HB-HV) com PCL apresentam aumento da porosidade com o aumento do percentual de PCL. Considerando-se a influência de poros na velocidade de liberação de fármacos, bem como a ausência de estudos que correlacionem quantitativamente perfis de liberação e características morfológicas de micropartículas de P(HB-
Publicado em: 2007
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11. Photophysical properties of polymers modified with light-emitting groups : crosslinked polyethylenes and poly (methyl methacrylate) / Propriedades fotofisicas de polimeros modificados com grupos emissores : polietilenos reticulados e poli (metacrilato de metila)
Fluorescent systems with interesting photophysical properties were the aim of this work. Fluorescent molecules sorbed into polymeric matrices can act as local probes for any mechanical processes that occur leading to changes in the optical response of the probe. In this work pyrene and a carbazole derivative were employed as fluorescent sensor for relaxation
Publicado em: 2006
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12. Microrheology of poly(butylene terephthalate) / poly(styrene-co-acrylonitrile) blends. / Estudos microrreológicos da blenda PBT/SAN.
This work was motivated by the need of a better understanding of the microrheological characteristics of polybutylene terephthalate, PBT, polymer blends, such as the matrix phase PBT and the styrene-acrylonitrile, SAN copolymer as dispersed phase. The main purpose of the microrheological studies carried out was to analyze the rheological behavior and the mor
Publicado em: 2006