Poly Hydroxybutyrate Co Hydroxyvalerate Phbv
Mostrando 1-12 de 24 artigos, teses e dissertações.
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1. The influence of natural clay and organoclay vermiculite on the formation process of bionanocomposites with poly (3-hydroxybutyrate-co-3-hydroxyvalerate)
ABSTRACT During the last decades, a lot of research work focused on several biodegradable and biosourced polyesters for the purpose of reducing the non-degradable polymer wastes. These polyesters are particularly considered to be promising polymers for biomedical applications and short life-time products like packaging. As these packagings are rapidly discar
Matéria (Rio J.). Publicado em: 02/10/2017
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2. PHBV/cellulose nanofibrils composites obtained by solution casting and electrospinning process
ABSTRACT In this work, nanobiocomposites of poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) reinforced with cellulose nanofibrils (CNFs) were produced by electrospinning and solution casting process. CNFs were obtained by sulfuric acid hydrolysis from Imperata brasiliensis fibers. Nanocomposites loaded with 1 (wt. %) of CNFs were prepared using a mixtur
Matéria (Rio J.). Publicado em: 20/07/2017
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3. Preparation and Characterization of Maleic Anhydride Grafted Poly(Hydroxybutirate-CO-Hydroxyvalerate) – PHBV-g-MA
A compatibilizer agent was successfully produced by grafting maleic anhydride (MA) to poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) chains on a reactive processing by mechanical mixing, using a mixture of PHBV, MA and dicumyl peroxide (DCP) as initiator. The resulting PHBV grafted MA (PHBV-g-MA) was characterized by Fourier transform infrared (FTIR) spectr
Mat. Res.. Publicado em: 12/02/2016
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4. Biodegradation of films of low density polyethylene (LDPE), poly(hydroxibutyrate-co-valerate) (PHBV), and LDPE/PHBV (70/30) blend with Paecilomyces variotii
The increased consumption of plastics in the world has been a subject of great concern and special attention by the scientific community. The aim is to promote development of materials that are biodegradable in a shorter time upon disposal in the environment. The most used synthetic plastics are difficult to biodegrade because they are made of long hydrocarb
Polímeros. Publicado em: 2015-02
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5. Natural additives for poly (hydroxybutyrate - CO - hydroxyvalerate) - PHBV: effect on mechanical properties and biodegradation
In this work, the improvement of mechanical properties in biodegradable materials was obtained through the incorporation of natural and also biodegradable plasticizers and nucleation agents into the PHBV copolymer. PHBV production with different quantities of additives was obtained by extrusion followed by injection. The additives in the copolymer were effic
Mat. Res.. Publicado em: 21/10/2014
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6. Nanopartículas de poli-hidroxibutirato-co-valerato como suporte para a imobilização da lipase de Candida antarctica fração B
This work evaluates the immobilization of Candida antarctica lipase (Fraction B) using poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) nanoparticles as support. The effects of immobilization time (30-150 min) and pH (5-10) on lipase loading were evaluated. The stability of the immobilized enzyme towards temperature (40, 60, and 80 ºC), reuse and storage (at
Quím. Nova. Publicado em: 2014-04
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7. Influence of poly(ethylene grycol) - (PEG) on the properties of influence of poly(3-hydroxybutyrate-CO-3-hydroxyvalerate) - PHBV
Films of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) - PHBV with polyethylene glycol (PEG) were prepared by casting solvent evaporation. The thermal behavior, morphology, crystallinity and molecular weight of these films were studied by the following techniques: differential scanning calorimetry (DSC), scanning electron microscopy (SEM), X-ray diffraction (
Polímeros. Publicado em: 11/06/2013
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8. Poly(3-hydroxybutyrate-co-3- hydroxyvalerate) nanoparticles prepared by a miniemulsion/solvent evaporation technique: effect of phbv molar mass and concentration
Miniemulsification and emulsion/solvent evaporation techniques were combined to produce poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) nanoparticles. Those nanoparticles were prepared with different PHBV molar masses and PHBV concentrations to verify their effect on the final particle size. Nanoparticles with an average diameter of 133 nm were obtained
Braz. J. Chem. Eng.. Publicado em: 2013-06
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9. Properties of melt-processed poly(hydroxybutyrate-co-hydroxyvalerate)/starch 1: 1 blend nanocomposites
Melt blending of 1:1 poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and glycerol-plasticized starch (TPS) was performed in the presence of an organically-modified montmorillonite, incorporated at 2.5, 5, 7.5 and 10 wt% amounts. Scanning electron micrographs (SEM) revealed the role of the organoclay as a compatibilizing agent for the immiscible blend. Th
Polímeros. Publicado em: 28/05/2013
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10. Coprecipitation of safrole oxide with poly(3-hydroxybutyrate-co-3-hydroxyvalerate) in supercritical carbon dioxide
5-(Oxiran-2-ilmetil)-1,3-benzodioxol ou epóxi-safrol (SO) vem sendo estudado ao longo dos anos devido a suas propriedades dependentes da concentração, como indução à apoptose e transdiferenciação celular. A coprecipitação do SO com um polímero biodegradável e biocompatível, poli(3-hidroxibutirato-co-3-hidroxivalerato) (PHBV), foi realizada utili
J. Braz. Chem. Soc.. Publicado em: 2013-02
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11. Nanocompósitios poliméricos biodegradáveis à base de poli(hidroxibutirato-co-hidroxivalerato)
In this work, poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) nanocomposites were prepared by melt intercalation process using 1, 3 and 5 wt% of different phyllosilicates ¿ montmorillonite (OMMT) and halloysite (HNT). The effect of the clay type and content, as well as the processing conditions and the modification with organosilanes on the morphology and t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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12. Morphology and thermal properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/attapulgite nanocomposites
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) - PHBV is a biodegradable polyester which has been studied as an option for the production of disposable goods. Attapulgite is a fibrous clay mineral. The aim of this work was to produce and characterize renewable resource derived-nanocomposites based on PHBV and organophilic attapulgite (MAT). The nanocomposites
Materials Research. Publicado em: 05/08/2011