Avaliação de clones de borracha natural crua por ensaios padrão e análise dinâmico-mecânica

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Tailoring the Structural Properties of PVDF and P(VDF-TrFE) by Using Natural Polymers as Additives

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Thermogravimetric studies of the decomposition kinetics of four different Hevea rubber clones using Ozawa's approach

Thermal degradation of natural rubber extracted from four different rubber clones of the Hevea brasiliensis species was investigated by thermogravimetry using Ozawa's approach to assess the kinetic parameters of the decomposition process. The results are discussed in terms of the order of reaction, kinetic parameters such as activation energy as a function of conversion degree, and thermal stability for each of the clones.

Subcutaneous tissue reaction and cytotoxicity of polyvinylidene fluoride and polyvinylidene fluoride-trifluoroethylene blends associated with natural polymers

Cytotoxicity and subcutaneous tissue reaction of innovative blends composed by polyvinylidene fluoride and polyvinylidene fluoride-trifluoroethylene associated with natural polymers (natural rubber and native starch) forming membranes were evaluated, aiming its applications associated with bone regeneration. Cytotoxicity was evaluated in mouse fibroblasts culture cells (NIH3T3) using trypan blue staining. Tissue response was in vivo evaluated by subcutaneous implantation of materials in rats, taking into account the presence of necrosis and connective tissue capsule around implanted materials after 7, 14, 21, 28, 35, 60, and 100 days of surgery. The pattern of inflammation was evaluated by histomorphometry of the inflammatory cells. Chemical and morphological changes of implanted materials after 60 and 100 days were evaluated by Fourier transform infrared (FTIR) absorption spectroscopy and scanning electron microscopy (SEM) images. Cytotoxicity tests indicated a good tolerance of the cells to the biomaterial. The in vivo tissue response of all studied materials showed normal inflammatory pattern, characterized by a reduction of polymorphonuclear leukocytes and an increase in mononuclear leukocytes over the time (p < 0.05 Kruskal-Wallis). On day 60, microscopic analysis showed regression of the chronic inflammatory process around all materials. FTIR showed no changes in chemical composition of materials due to implantation, whereas SEM demonstrated the delivery of starch in the medium. Therefore, the results of the tests performed in vitro and in vivo show that the innovative blends can further be used as biomaterials. © 2013 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 101B: 1284-1293, 2013. Copyright © 2013 Wiley Periodicals, Inc.

Obtenção e caracterização de filmes nanoestruturados de polianilina/látex de borracha natural

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Obtenção e caracterização elétrica e morfológica de compósitos de borracha natural com PZT

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Obtenção e caracterização de filmes de PHB e de blendas de PHB com borracha natural

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

A integração agricultura-indústria: uma análise da cadeia agroindustrial da borracha natural da microrregião geográfica de São José do Rio Preto-SP

Pós-graduação em Geografia - FCT

Caracterização dos constituintes do látex e da borracha natural que estimulam a angiogênese

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Membranas de borracha natural recobertas com nanopartículas de ouro: síntese e caracterização

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudos de imagens provenientes de membranas de borracha natural com aditivos metálicos utilizando técnicas de Fourier, Gabor e Wavelets

Pós-graduação em Ciência e Tecnologia de Materiais - FC

Preparação e caracterização de nanocompósitos multifuncionais obtidos com nanopartículas ferroelétricas e paramagnéticas em filmes de borracha natural: Preparación y caracterización de nanocompuestos multifuncionales obtenidos con nanopartículas ferroelétricas y paramagnéticas en películas de caucho natural

Pós-graduação em Ciência e Tecnologia de Materiais - FC

Método de produção de nanocompósitos funcionais e produtos obtidos

The patent application relates to the method for producing functional nanocomposites made of paramagnetic nanoparticles with Ni0.5Zn0.5Fe2O4 stoichiometry and to the thus obtained product. The method comprises at least the following steps: producing functional nanocomposites by the modified polyol method; mechanically blending the functional nanocomposites with natural rubber and adding vulcanising agents; and thermoforming the functional nanocomposite.

Obtenção de compósitos de borracha natural com resíduo industrial de couro reticulados com diferentes peróxidos

Pós-graduação em Ciência e Tecnologia de Materiais - FC

Liberação de componentes do extrato de Casearia sylvestris Swartz empregando membranas de látex natural como suporte

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)