Isocyanate
Mostrando 1-12 de 59 artigos, teses e dissertações.
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1. EFECTO DE LA ADICIÓN DE POLÍMEROS DE CADENA CORTA SOBRE LA ESTRUCTURA QUÍMICA, PROPIEDADES MECÁNICAS, TÉRMICAS Y BIOLÓGICAS DE POLIURETANOS SINTETIZADOS CON DIISOCIANATOS ALIFÁTICOS Y ACEITE DE HIGUERILLA
The objective of this research was to synthesize biocompatible polyurethanes, with suitable mechanical properties to be used as biomaterials. Polyurethanes were synthesized with polyols derived from castor oil and isophorone diisocyanate (IPDI), hexamethylene diisocyanate and 4,4’-methylenebis (cyclohexyl isocyanate), with the addition of polycaprolactone/
Quím. Nova. Publicado em: 2021-01
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2. Influência da concentração dos monômeros de acrilato e metacrilato de hidroxipropila na copolimerização em emulsão do estireno com acrilato de n-butila e acrilonitrila para produção de adesivos.
RESUMO Monômeros acrílicos contendo grupos hidroxila são frequentemente empregados na produção de polímeros, especialmente para aplicações em diferentes substratos ou mesmo em reações posteriores de modificação química com grupos isocianato ou carboxila. Este trabalho tem como objetivo estudar o efeito da concentração dos monômeros de acrilat
Matéria (Rio J.). Publicado em: 16/09/2019
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3. Technological Feasibility of Hovenia dulcis thunb. Species for the Production of Edge Glued Panels
ABSTRACT This study aims to evaluate the use of Hovenia dulcis wood to produce Edge Glued Panels – EGP. To this end, joints with dimensions of 5.0 × 31.0 × 2.5 cm (Width × Length × Thickness) were put together using polyvinyl acetate (PVAc) and emulsion polymer isocyanate (EPI) adhesives at a spread rate of 200 g.m-2 and the chemical characterization
Floresta Ambient.. Publicado em: 05/04/2018
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4. Evaluation of Filler Effects on the Dynamic Mechanical Behavior of HTPB-Elastomer Used as Binder in Exemplary Composite Formulations
ABSTRACT: This study aims to evaluate the dynamic mechanical properties of a binder, used in composite propellants, with increasing amount of different solid fillers. Dynamic Mechanical Analysis (DMA) is performed to determine the region of glass-rubber transition temperature (Tg). Further parameters were obtained from the description of the loss factor curv
J. Aerosp. Technol. Manag.. Publicado em: 2017-09
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5. Castor oil and commercial thermoplastic polyurethane membranes modified with polyaniline: a comparative study
The study of conducting polymeric membranes is decisive in some areas, as in fuel cells and electrodialysis. This work aims the study of membranes using conventional and conductive polymers blends. Two types of polyurethane were used as conventional polymers, commercial thermoplastic polyurethane and polyurethane synthesized from castor oil and 4-4-dicyclohe
Mat. Res.. Publicado em: 10/05/2013
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6. Cellulose-reinforced composites: from micro-to nanoscale
This paper present the most relevant advances in the fields of: i) cellulose fibres surface modification; ii) cellulose fibres-based composite materials; and iii) nanocomposites based on cellulose whiskers or starch platelet-like nanoparticles. The real breakthroughs achieved in the first topic concern the use of solvent-free grafting process (plasma) and th
Polímeros. Publicado em: 2013
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7. Estudo dos produtos químicos originados a partir da degradação do gel de clorexidina a 2%, por meio da Cromatografia Gasosa acoplada à Espectrometria de Massas / Study of chemicals derived from the degradation of 2 % chlorhexidine gel, by means gas chromatography coupled to mass spectrometry
The aim of this study was to determine, by means of gas chromatography coupled to mass spectrometry (GC-MS), products originated from the degradation of 2 % chlorhexidine digluconate (CHX) gel. Three gels were selected: commercial Gel_Chlorhexidina® (Maquira), 2 % CHX gel UNIARARAS (handled at the Pharmacy Education UNIARARAS) and 2% CHX gel prepared in lab
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/01/2012
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8. Thermoplastic polyurethane synthesis using POSS as a chain modifier
In this study, thermoplastic polyurethanes (TPUs) were synthesized using the one-shot process in solution. To obtain the samples n-phenylaminopropyl polyhedric oligomeric silsesquioxane (POSS) was added as a chain modifier during the synthesis in four different amounts. The samples were characterized by infrared spectroscopy (FTIR), thermogravimetric analysi
Materials Research. Publicado em: 31/07/2012
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9. Síntese e caracterização de poliuretano à base de óleo de Mabea fistulifera Mart. e sua utilização para remoção de corantes têxteis / Synthesis and characterization of Mabea fistulifera Mart. oil based polyurethane its use for textile dyes removal
Hard polyurethane polymers (PU-1, PU-2, PU-3 and PU-4) were developed in this study, obtained from polyols derived from Mabea fistulifera Mart oil. The chemical modification of the oil occurred through an in situ hydroxylation reaction employing acetic acid, hydrogen peroxide and sulfuric acid. The reaction conditions were optimized using a factorial composi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2011
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10. Síntesis de microcápsulas de poliurea a partir de aminas renovables, mediante doble emulsificación
This paper reports on the microencapsulation of a commercial perfume by means of a double emulsification, where the polyurea shell was synthesized by the reaction of lysine with two commercial di-isocyanates (aromatic and aliphatic). In the synthesis the factors evaluated were the amine:di-isocyanate molar ratio and the type of emulsifier. The particle size
Polímeros. Publicado em: 13/05/2011
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11. Alternativas para o Reaproveitamento de Rejeitos Industriais de Poli(tereftalato de etileno) Reciclado / Alternatives for recycling of industrial wastes of recycled poly (ethylene terephthalate)
The production of nonwoven fabrics (NWF) by extrusion process from recycled poly(ethylene terephthalate) (PET) is an interesting way for polymer recycling used by industry which to allow conciliate economic viability with environmental benefits. However, during extrusion step, a fraction of material is lost due to equipment clogging or others factors, leadin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/07/2010
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12. Síntesis y caracterización de adhesivos reposicionables de poliuretano dispersos en agua, obtenidos a partir de aceite de castor maleinizado
This work focused on the production of aqueous dispersions of polyurethane using the emulsification method by phase inversion. For the synthesis two polyols were employed, viz. a commercial polyester and Maleinizated Castor Oil (MACO), with two diisocyanates: one aromatic, toluene diisocyanate (TDI) and another aliphatic, hexamethylene diisocyanate (HDI), wh
Polímeros. Publicado em: 11/06/2010