Polyurethane Derived From Castor Oil
Mostrando 1-12 de 24 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. Biodegradable oil-based polymeric coatings on urea fertilizer: N release kinetic transformations of urea in soil
ABSTRACT: Polymer coatings are used to control the rate of release of plant available nutrients from fertilizers as well as to reduce nutrient losses such as ammonia (NH3) volatilization. Although the literature presents several examples of materials used to coat urea, little is known about nitrogen (N) release properties such as the mechanism involved and p
Sci. agric. (Piracicaba, Braz.). Publicado em: 01/07/2019
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3. The influence of fiber size on the behavior of the araucaria pine nut shell/PU composite
Abstract The use of araucaria pine nut shell in polymer composites may increase the pine nut value and help protec araucaria (Araucaria angustifolia) itself, which is an endangered species. The aim of this work is to study the influence of the size of pine nut shell fiber on the mechanical properties of composites made of this shell and polyurethane derived
Polímeros. Publicado em: 10/06/2019
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4. Conductive Composites Based on Polyurethane and Nanostructured Conductive Filler of Montmorillonite/Polypyrrole for Electromagnetic Shielding Applications
In this study, composites based on polyurethane (PU) derived from castor oil and montmorillonite/polypyrrole doped with dodecylbenzenesulfonic acid (MMt-PPy.DBSA) were developed. In order to investigate the potential use of these materials for electromagnetic shielding applications, the electrical and mechanical properties of PU/MMt-PPy.DBSA composites were
Mat. Res.. Publicado em: 30/07/2018
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5. Gamma radiation effect on sisal / polyurethane composites without coupling agents
Abstract Natural fibers and polyurethane based composites may present chemical bonding between the components of the polymer and the lignin of the fiber. The incidence of radiation can cause degradation of the polymeric material and alter its mechanical properties. The objective of this study was to obtain and characterize cold pressed composites from polyur
Polímeros. Publicado em: 29/06/2017
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6. A castor oil-containing dental luting agent: effects of cyclic loading and storage time on flexural strength
Favorable results in the use of castor oil polyurethane (COP) as pulp capping, membrane material, sealer, mouthwash and in bone repair, associated with the fact that Ricinus communis is not derived from petroleum and it is abundant in Brazil, encourage researches in the development of luting agents. Objectives This study compared the flexural strength (FS
J. Appl. Oral Sci.. Publicado em: 2014-12
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7. UV and gamma irradiation effects on surface properties of polyurethane derivate from castor oil
Gamma and ultraviolet radiation effects on hardness, elastic modulus and viscoelastic properties of polyurethane derived from castor oil (PU) were investigated by nanoindentation tests. Modifications on surface morphology, induced by radiation, were observed by atomic force microscopy. The polyurethane derivate from castor oil shows good resistance to gamma
Polímeros. Publicado em: 21/05/2013
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8. Evaluation of the properties of iron oxide-filled castor oil polyurethane
The aim of this study was to obtain and evaluate the electrical, thermal and mechanical properties of iron oxide-filled castor oil polyurethane (PU/Fe2O3). The iron oxide used in this study was a residue derived from the steel pickling process of a Brazilian steel rolling industry. Polymeric composites with different iron oxide volume fractions (2.5, 5.0, 7.
Mat. Res.. Publicado em: 26/10/2012
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9. Estudos mecânicos e elétricos em madeiras envoltas com manta geossintética e impregnadas com resina poliuretana / Mechanical and electrical analysis of wood wrapped in geosynthetic blanket impregnated with polyurethane resin
Nas redes de distribuição de energia, as cruzetas sofrem uma exposição direta a intempéries, particularmente à ação da umidade, o que acelera seu processo de degradação. A higroscopicidade da madeira facilita a absorção de água, com significativa perda de suas características mecânicas e elétricas. Para minorar os problemas relacionados a abs
Publicado em: 2011
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10. Estudo das propriedades físico-químicas da poliuretana derivada do óleo de mamona com potencial aplicação na área médica / Study of physical chemical properties of polyurethane derived from castor oil potential application in the medical
O presente trabalho envolve um estudo das propriedades físico-químicas de uma poliuretana obtida a partir do óleo de mamona, desenvolvida pelo Grupo de Química Analítica e Tecnologia de Polímeros do Instituto de Química de São Carlos - USP. Este polímero apresenta-se como um material biocompatível, possuindo em sua estrutura molecular, segmentos de
Publicado em: 2010
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11. Caracterização da espuma rígida de poliuretano (PU) derivada de óleo de mamona para isolamento térmico na construção civil / Characterization of rigid foam polyurethane (PU) derived from castor oil for building insulation.
Este trabalho teve como objetivo o estudo da espuma rígida de poliuretano (PU) derivada de óleo de mamona para aplicação como forro na isolação térmica de sistemas de cobertura. Dentro deste objetivo foram caracterizadas as suas propriedades termomecânicas e avaliado o seu comportamento térmico quando aplicada como forro em células de teste em quat
Publicado em: 2010
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12. Biodegradation of polyurethane derived from castor oil
The aim of this research was to study the biodegradation of a polymer derived from castor oil, which is a renewable, natural material that is a practical alternative for the replacement of traditional polyurethane foams. Due to its molecular structure, which contains polyester segments derived from vegetable oil, the polymeric surface is susceptible to micro
Polímeros. Publicado em: 2008-09