Miscibility
Mostrando 13-24 de 70 artigos, teses e dissertações.
-
13. The effect of additives interaction on the miscibility and crystal structure of two immiscible biodegradable polymers
Poly lactic acid (PLLA) is a promising biopolymer, obtained from polymerization of lactic acid that is derived from renewable resources through fermentation. The characteristic brittleness of PLLA is attributed to slow crystallization rates, which results in the formation of the large spherulites. Its glass temperature is relative high, above room temperatur
Polímeros. Publicado em: 2014
-
14. Processing of a LLDPE/HDPE pressure vessel liner by rotomolding
Biaxial rotational molding is a low-pressure process that uses a polymer powder to produce large and/or complex-shaped hollow thermoplastic goods using low cost molds, being very suitable for prototype production. In the present work, liner prototypes (F 78 × 280 mm) made of linear low density (LLDPE) and high density polyethylene (HDPE) blends were produce
Mat. Res.. Publicado em: 08/11/2013
-
15. Correlation between morphological properties and ionic conductivity in an electrolyte based on poly(vinylidene fluoride) and poly (2-hydroxyethyl methacrylate)
Materials based on a mixture of poly(vinylidene fluoride) (PVDF), poly(2-hydroxyethyl methacrylate) (PHEMA) and LiClO4 were produced to evaluate their ionic behavior and morphological structure to determine if they can be used as an electrolyte in electrical devices. FTIR chemical analysis results indicated the presence of interactions between PVDF, PHEMA an
Mat. Res.. Publicado em: 27/09/2013
-
16. Solid state polymerization: its action on thermal and rheological properties of PET/PC reactive blends
The solid state polymerization (SSP) of PET/PC reactive extrusion blends - with and without cobalt catalyst - at different polymer ratios was studied. Thermal and rheological evaluations were performed. DSC results showed changes in the PET's Tg, Tch, Tm and Xc.. The melt flow rate (MFR) decreased for PET and the blends. The intrinsic viscosity increased. Th
Polímeros. Publicado em: 28/05/2013
-
17. Separación de fases y cristalinidad en mezclas epoxy/poli-3-hidroxibutirato
In this work, epoxy/poly-3-hydroxybutyrate (PHB) blends in two different proportions, 90/10 and 85/15, were studied. For this purpose, the samples were submitted to 80ºC and 120ºC for the curing process of epoxy. The phase separation and the crystallization were analyzed using optical microscopy and differential scanning calorimetry. Likewise, the lamellar
Polímeros. Publicado em: 28/05/2013
-
18. Numerical analysis of phase decomposition in A-B binary alloys using Cahn-Hilliard equations
The analysis of phase decomposition was carried out using the nonlinear and linear Cahn-Hilliard equations in a hypothetical A-B alloy system with a miscibility gap. These equations were solved by the explicit finite difference method assuming a regular solution model. The supersaturated solid solution and decomposed phases were considered to have an fcc str
Mat. Res.. Publicado em: 28/05/2013
-
19. 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
-
20. Miscibility influence in the thermal stability and kinetic parameters of poly (3-hydroxybutyrate)/poly (ethylene terephthalate) sulphonated blends
The thermal degradation of miscible and immiscible poly (3-hidroxy butyrate) PHB/ poly (ethylene terephthalate) sulphonated (PETs) blends was investigated using thermogravimetric analyses. Model-free kinetic analysis, Vyazovkin and Flynn-Wall-Ozawa's methods, were used to determine the apparent activation energy in the whole interval of degradation of the pu
Polímeros. Publicado em: 11/06/2010
-
21. Blendas de PHB e seus copolímeros: miscibilidade e compatibilidade
Poly(hydroxybutyrate) and its copolymers are linear polyesters behaving as conventional thermoplastic materials. However, they are totally biodegradable and produced by a wide variety of bacteria from renewable sources. Some properties and high production cost are still preventing future applications. In an attempt to improve the properties and to reduce cos
Química Nova. Publicado em: 2010
-
22. Thermal, mechanical and morphological properties of poly (hydroxybutyrate) and polypropylene blends after processing
The ever increasing accumulation of plastic waste in the environment has motivated research on polymers that degrade rapidly after being discarded as possible substitutes for conventional inert plastics. Biodegradable polymers can be an alternative, since they have non-toxic residual products and low environmental permanence. Poly (hydroxybutyrate) is a biod
Materials Research. Publicado em: 2009-06
-
23. Compatibilização de blenda polimérica de poliamida 6,6/ polietileno de baixa densidade utilizando radiação ionizante de feixe de elétrons / Compatibilization of Polyamide 6.6 and Low Density Polyethylene Polimeric Blend Using Electron Beam Ionizing Radiation.
A indústria de plástico tem reconhecido que novos materiais podem ser produzidos por meio da mistura de polímeros dando origem às chamadas blendas poliméricas. Estes materiais, em geral, apresentam uma melhoria das propriedades em relação às dos polímeros que formam a blenda. Freqüentemente, as blendas são produzidas a partir de polímeros imiscí
Publicado em: 2009
-
24. Soybean oil ethanol extraction and ethyl esterification in miscellae / Extração de óleo de soja com etanol e transesterificação etílica na miscela
The present models of biodiesel production is based on biodiesel plants regardless of the oil extraction industry location, causing many logistic problems and fails on the system, which in order not to go unactive, adopts unusual fat sources, raising the costs of the final product, and losing market competitiveness to diesel fuel. In this paper, we developed
Publicado em: 2008