The production of poly(lactic acid) (PLA) biodegradable blends with other biopolymers, such as poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), and the introduction carbon nanotubes (CNT) are promising solutions for electrical electromagnetic application.PHBV has a great potential to improve processing toughness PLA.The addition CNT contributes properties polymeric nanocomposites.PLA/PHBV blend (80/20) PLA/PHBV blend-based nanocomposites 0.5 1.0 wt% were produced.Morphology images showed...

Abstract Biodegradable polymers are an alternative to replacing petroleum‐derived polymers. This work aimed incorporate coffee grounds (CG) in different contents (5 and 15 wt%) as accelerator of the biodegradation process reduce degradation time poly (lactic acid) (PLA). The use this natural source filler can minimize environmental problems, due its low cost easy access, since waste is produced large quantities. Thus, biodegradable composite be with CG PLA matrix. PLA/CG composites processed...

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) was reinforced with titanium dioxide (TiO2) in concentrations of 1.0%, 2.5% and 5.0% (m/m) to produce nanocomposites by the solvent casting technique. TiO2 synthesized a hydrothermal treatment nanoparticles. The nanostructure nanoparticles studied x-ray diffraction analysis (XRD) transmission electron microscopy (TEM). XRD confirmed crystalline nanoparticles, mixture anatase rutile phases. Through TEM analysis, formation nanorod...

The introduction of multi-walled carbon nanotubes (MWCNTs) into polymer matrixes has been an important tool to alter and improve some properties in nanocomposites, including biodegradable polymers such as poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). In this work, PHBV nanocomposites with 0.05, 0.50, 1.00, 1.50 2.00 wt % MWCNTs were produced by solvent casting. MWCNT morphology structure characterized Raman spectroscopy, transmission electron microscopy (TEM). It was observed that...

The intense consumption of conventional plastics has been generating a series problems for nature due to the accumulation municipal solid waste because its difficult degradation. Therefore, use biodegradable polymers becomes good option minimize these effects. Poly (lactide acid)/poly(butylene adipate-co-terephthalate) (PLA/PBAT) is blend that can be used mainly in applications have short shelf life. So, it important know total biodegradation time this blend. For reason, PLA/PBAT films (1.5...

ABSTRACT In this work, the effect of carbon nanotubes (CNT) on biodegradability poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) (PHBV) nanocomposites with 1 and 2% (w/w) CNT has been evaluated by biodegradation assays in aqueous medium containing microorganisms extracted from garden soil. After process, samples PHBV PHBV/CNT were compared regarding magnitude degradation visual macroscopic analysis, measurement percentage weight loss scanning electron microscopy (SEM). The further...

In this work, a new strategy of carbon nanotubes (CNT) pre-dispersion (PD) in acetone to produce poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/CNT nanocomposites was evaluated. PHBV/CNT were produced the molten state with addition 0.5 wt% CNT and evaluated by scanning electron microscopy field emission gun (FEG-SEM), differential calorimetry (DSC), Izod impact tests, nanohardness, x-ray diffraction (XRD). FEG-SEM showed well-dispersed for sample subjected (PHBV/CNT-PD), DSC reduction...

Biodegradable polymers have been increasingly used for scientific and commercial applications because they are similar to some conventional thermoplastics exhibit the ability of self-degradation. Poly(3-hydroxybutyrate-co... | Find, read cite all research you need on Tech Science Press

Polyamines are low molecular weight compounds that present in all living organisms. They related to the pathological processes, and have been studied as biomarkers for tumor progression, being analyzed patients' biological fluids. However, polyamines can undergo degradation serum samples, depending on storage conditions, which impairs their quantification these matrices. In this work, capillary electrophoresis using indirect ultraviolet detection has developed applied evaluate stability of...

Abstract The use of biodegradable polymers is an interesting way to reduce the polymeric waste accumulation in environment. However, addition fillers polymer matrices may decrease their biodegradability. Glassy carbon (GC) a promising material that can be employed as filler production antistatic packaging utilized protect electronic components. matrix such poly (3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) (PHBV) excellent alternative for preparation green composites used these packages. This...

The aim of this essay is to map out the racial discourses 1950s, particularly those pertinent 1958 Soccer World Cup, in order better understand main ideas about race, which were vogue at time when Edson Arantes do Nascimento (Pelé) became (inter)nationally famous as a great sports star. argues that Pelé’s statements regarding race and relations Brazil inherently based on prevalent among academics Brazil’s black activists during 1950s. professional asceticism his belief individualism,...

Abstract The development of biodegradable polymers has been stimulated owing to the inappropriate litter disposing in order replace conventional with long‐time degradation. As their performance is a challenge this replacement, insertion additives such as poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) (PHBV) consists an effective way adjusting properties. For reason, it was analyzed incorporation tributyrin (TB) matrix PHBV plasticizer, so that higher plastic deformation achieved. Samples...

The present study carried out the characterization of carbon nanotubes (CNT) recovered from biodegradation process poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/CNT nanocomposites and use this CNT (CNT-rec) in production new PHBV nanocomposites.The results obtained by CNT-rec were very similar to CNT.Therefore, it was possible state that properties preserved during process; however, contained impurities such as proteins residual PHBV.Regarding performance nanofillers, although both...

Radar-absorbing materials (RAMs) have been used in military applications for several decades to reduce radar detection of vessels and aircrafts. In the present work, performance Ni0.35Zn0.35Cu0.3Fe2O4 ferrite as a RAM is investigated. The was firstly synthesized by combustion reaction then calcinated at 1200 °C 1 h. Composites were prepared with 80:20, 70:30 60:40 concentrations weight ferrite:polychloroprene. X-ray diffraction (XRD) analysis showed single phase formation scanning electron...

O artigo propõe discutir sobre a atuação do enfermeiro da atenção primária à saúde no reconhecimento de violência sexual infantil. Trata-se uma revisão integrativa literatura, banco dados indexados BVS com descritores Child Abuse, Sexual and Nurse's Role or Primary Health Care, entre os anos 2016 e 2021. Resultados: profissionais enfermagem têm papel fundamental na identificação, cuidado notificação dos casos precisam ser capacitados continuamente para desempenharem um trabalho ético qualificado.