Physical Mechanical Properties Of Cellulose
Mostrando 13-20 de 20 artigos, teses e dissertações.
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13. Biocomposites of lignin-, tannin- and glyoxal- based polymeric matrices reinforced with natural fibers / Biocompósitos a partir de matrizes poliméricas baseadas em lignina, tanino e glioxal reforçadas com fibras naturais
The present study aimed at developing biocomposites combining polymeric matrices and reinforcement agents, employing the highest possible proportion of materials obtained from natural sources. Phenolic resins are widely known and used due to their excellent properties, such as dimensional and thermal stability, flame resistance and chemical resistance. Howev
Publicado em: 2010
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14. Avaliação dos processos de polpação soda-antraquinona e bissulfito-base magnésio para bambu / Evaluation of soda-antraquinone and magnesium base bisulfite pulping processes with bamboo
O presente estudo teve como objetivo avaliar e comparar os processos de polpação sodaantraquinona e bissulfito base magnésio para Bambusa vulgaris Schrad. com 2 anos de idade oriundos de plantios comerciais no Maranhão Brasil visando a produção de polpa celulósica branqueável e não branqueável (números kappa 30±2 e 50±2 respectivamente). A maté
Publicado em: 2010
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15. Application of peracetic acid in the eucalyptus pulp bleaching and its quality impact / Aplicação do ácido peracético no branqueamento da polpa de eucalipto e o impacto na sua qualidade
In the productive sector of cellulose the demands on the quality of the final product are too great, once the market is very competitive and globalized. The main objectives of this paper were the establishment of appropriate conditions to implement the peracetic acid as the last stage of elemental chlorine-free (ECF) bleaching sequence and assessing the impa
Publicado em: 2008
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16. 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
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17. Métodos alternativos para aproveitamentos das hemiceluloses da madeira de eucalipto na indústria de celulose kraft / Alternative methods for using eucalyptus wood hemicelluloses in the kraft cellulose industry
The search for a better use of wood in the pulp industry has fuelled interest in a more rational use of its components, particularly hemicelluloses. This study investigates the impacts of alkaline leaching and self-hydrolysis of wood chips for hemicellulose removal, as well as re-adsorption into the fibers during kraft pulping of dissolved wood solids presen
Publicado em: 2007
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18. Durabilidade de argamassas modificadas por polimeros e reforçadas com fibras vegetais / Durability of fiber-cement polimer modify
Several researches on vegetal-fiber-cement composites have been developed aiming to solve problems related to the banishment of asbestos and environmental damages due to deposition or burnirng of agro-industry residues. The durability of the cellulose-cement composites is a key factor to introduce such material in the market. Several researches have been dev
Publicado em: 2004
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19. Stabilization of hot-melt extrusion formulations containing solid solutions using polymer blends
This study was aimed at enhancing the physical stability of the drug clotrimazole (CT) and the polymer contained within hot-melt extrusion (HME) films using polymer blends of hydroxypropyl cellulose (HPC) and poly(ethylene oxide) (PEO). The HME films were investigated for solid-state characteristics, moisture sorption, bioadhesivity, mechanical properties, g
Springer-Verlag.
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20. Physical mechanical and tablet formation properties of hydroxypropylcellulose: In pure form and in mixtures
The aim of the study was to analyze hydroxypropylcellulose (HPC) in pure form and in excipient mixtures and to relate its physical and chemical properties to tablet binder functionality. The materials used were Klucel hydroxypropylcellulose grades ranging from low to high molecular weight (80–1000 kDa) of regular particle size (250 µm mean size) and fine
Springer-Verlag.