Cellulose Ester
Mostrando 1-12 de 51 artigos, teses e dissertações.
-
1. Regenerated Cellulose Membrane from Peanut Shell for Biodiesel Purification
Biodiesel purification by water washing has been proved to be an unattractive process from an economic and environmental point of view. In this work, we propose the use of regenerated cellulose membranes from peanut shell as an alternative in the biodiesel purification. The preparation of the membranes was optimized from a central composite design, resulting
J. Braz. Chem. Soc.. Publicado em: 2020-05
-
2. Soil Biodegradation of PLA/CNW Nanocomposites Modified with Ethylene Oxide Derivatives
Due to its ester bonds, poly(lactic acid) (PLA) undergoes biodegradation in humid environments, attracting market attention. The goal of this work was to observe the biodegradation in garden soil of PLA nanocomposites with neat (PLA/CNW) and surfactant modified cellulose nanowhiskers (PLA/CNW/S). Three types of surfactants were tested: poly(ethylene glycol)
Mat. Res.. Publicado em: 01/03/2018
-
3. HYDROLYTIC DEGRADATION BEHAVIOR OF PLLA NANOCOMPOSITES REINFORCED WITH MODIFIED CELLULOSE NANOCRYSTALS
Bionanocomposites derived from poly(L-Lactide) (PLLA) were reinforced with chemically modified cellulose nanocrystals (m-CNCs). The effects of these modified cellulose nanoparticles on the mechanical and hydrolytic degradation behavior of polylactide were studied. The m-CNCs were prepared by a method in which hydrolysis of cellulose chains is performed simul
Quím. Nova. Publicado em: 2015-09
-
4. Clinical and mycological analysis of dog's oral cavity
The oral microbiota of humans and animals is made up of a wide variety of yeasts and bacteria, but microbiota of dogs is not totally described. Although such identification is an important step to establish the etiopathogenesis and adequate therapy for the periodontal disease The aim of this study was to evaluate and correlate oral alterations with the prese
Braz. J. Microbiol.. Publicado em: 09/04/2013
-
5. Enzyme loading dependence of cellulose hydrolysis of sugarcane bagasse
The enzymatic hydrolysis of steam-pretreated sugarcane bagasse, either delignified or non-delignified, was studied as a function of enzyme loading. Hydrolysis experiments were carried out using five enzyme loadings (2.5 to 20 FPU/g cellulose) and the concentration of solids was 2% for both materials. Alkaline delignification improved cellulose hydrolysis by
Quím. Nova. Publicado em: 2012
-
6. Solvatação em solventes puros e misturas binárias: fundamentos e aplicações / Solvation in pure solvents and binary mixtures: fundamentals and applications
Este trabalho visou compreensão da solvatação em solventes puros e misturas binárias, e aplicar as informações obtidas para analisar o efeito de solventes na síntese de líquido iônico, e na dependência das propriedades de filmes de acetatos de celulose, AC, sobre o grau de substituição do éster. Para a compreensão da solvatação utilizou-se co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/03/2011
-
7. comparação entre processos em SHF e em SSF de bagaço de cana-de-açúcar para a produção de etanol por Saccharomyces cerevisiae
In this work, four different process configurations, including three simultaneous saccharification and fermentation (SSF) schemes and one separate hydrolysis and fermentation (SHF) scheme, were compared, at 8% water-insoluble solids, regarding ethanol production from steam-pretreated and alkali-delignified sugar cane bagasse. Two configurations included a 16
Química Nova. Publicado em: 2010
-
8. Characterization and application of thin film of carboxymehtylcellulose acetate butyrate / Caracterização e aplicação de filmes finos de acetato butirato carboximetil celulose
The effect of ethyl acetate and acetone on the solution behavior of cellulose acetate butyrate (CAB) and carboxymehtylcellulose acetate butyrate (CMCAB) and on the characteristics of films obtained either by spin coating or adsorption was investigated. Viscosity and small angle X-ray scattering (SAXS) measurements showed that ethyl acetate is a better solven
Publicado em: 2009
-
9. Caracterização por ressonância magnética nuclear da celulose bacteriana acetilada em solução de dimetilacetamida/cloreto de lítio
Cellulose consists of an insoluble polysaccharide, used in industrial scale for manufacture of paper, films, or in the dust form, natural, hydrolyzed or derivatized. Bacterial cellulose, mainly produced by the bacterium Acetobacter xylinum, is identical to the vegetal one, but free of lignin and hemicellulose, wuich eliminates severe chemical processes of pu
Publicado em: 2008
-
10. Aplicações e caracterização de ésteres de celulose / Applications and characterization of cellulose esters
Esta tese está dividida em duas partes. Na Parte I, blendas de polietileno maleado (M-PE) e butirato acetato de celulose (CAB) (5-50% em massa) e compósitos de polietileno (PE) ou M-PE e 20% em massa de celulose, acetato de celulose (CA), propionato acetato de celulose (CAP) ou CAB foram preparados em um misturador. As estruturas e propriedades das mistura
Publicado em: 2008
-
11. Application of peptides in cosmetics: development of formulations, stability and efficacy / Aplicação de peptídeos em cosméticos: desenvolvimento de formulações, estabilidade e eficácia
The aim of this study was the development, evaluation of the stability and the efficacy of cosmetic formulations containing acetyl hexapeptide-3 (AHP), or acetyl tetrapeptide-5 (ATP) or mixture of di- and peptides (DTP). For this purpose the 6 following formulations (F) were developed: F1- containing hydroxyethyl cellulose (HEC), methylphenyl polysiloxane (M
Publicado em: 2008
-
12. Sintese e Caracterização de Derivados da Celulose Modificada com Anidridos Orgânicos : adsorção e Termodinamica de Interação com Cations Metalicos / Synthesis and characterization of cellulose derivatives with organic anhydrides : adsorption and interation thermodynamic metallic cations
Cellulose is a widely available biopolymer in nature and its draws considerable chemical interest due its various useful applications. The polysaccharide modification is primarily based on their hydroxyl group reactivity, which determines the carbohydrate chemistry and their related structures. The chemical modification of cellulose was carried out in a solv
Publicado em: 2007