Adriana de Campos
Empresa Brasileira de Pesquisa Agropecuária
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Publication
Featured researches published by Adriana de Campos.
Polimeros-ciencia E Tecnologia | 2011
Adriana de Campos; Kelcilene B. R. Teodoro; José Manoel Marconcini; Luiz H. C. Mattoso; Sandra Mara Martins-Franchetti
Sisal fibers treated with four methods, namely washing with water, washing with cyclohexane/ethanol, alkali treatment (NaOH) and bleaching (alkaline peroxide treatment), were incorporated in thermoplastic starch/polycaprolactone 80/20 (TPS/PCL) samples. Morphological, mechanical and thermal properties of TPS/PCL/Sisal biocomposites were analysed. The best results were obtained with the composite using the bleached fiber, which had improved tensile strength and thermal stability. An increased adhesion between the fiber and matrix was also observed with the bleached fiber, with 145% increase in the tensile strength
Carbohydrate Polymers | 2017
Adriana de Campos; Alfredo Rodrigues Sena Neto; Vanessa B. Rodrigues; Bruno R. Luchesi; Francys K.V. Moreira; Ana Carolina Corrêa; Luiz H. C. Mattoso; José Manoel Marconcini
Cassava starch films reinforced with cellulose nanowhiskers from oil palm mesocarp fibers were produced by casting. Nanowhiskers were obtained by sulphuric acid hydrolysis followed by microfluidization and incorporated in starch films at various loadings (1-10wt%). Morphological and mechanical characterizations showed that the reinforcing effect of oil palm cellulose nanowhiskers was significant at loadings of up to 6wt%, which was determined to be the nanowhiskers percolation threshold. Above this content, formation of agglomerates became more significant, causing a decrease in mechanical properties of starch bionanocomposites. Below percolation threshold, such as 2wt%, elongation at break increased by 70%, showing an effective reinforcing effect. Dynamic mechanical analyses revealed filler/matrix interactions through hydrogen bonding in bionanocomposites.
Carbohydrate Polymers | 2018
Pedro Ivo Cunha Claro; Ana Carolina Corrêa; Adriana de Campos; Vanessa Bolzan Rodrigues; Bruno Ribeiro Luchesi; Luiz Eduardo Silva; Luiz H. C. Mattoso; José Manoel Marconcini
A wide variety of new green materials such as curaua leaf fibers (CLFs) has potential applications in nanotechnology. This study aims to investigate the thermomechanical properties and morphological structure of cellulose nanocrystals (CNCs) and cellulose nanofibrils (CNFs) films obtained by continuous casting. The CNCs were obtained by acid hydrolysis and CNFs by mechanical shearing from bleached CLFs and eucalyptus pulp. The morphology after continuous casting resulted in oriented nanofibers, and as a consequence there was mechanical anisotropy. CNCs films showed the greatest values of tensile strength (36±4MPa) and the more effective fibrillation provided better mechanical strength of eucalyptus CNFs films than curaua CNFs films. Sulfur groups and mechanical shear degradation affected the stability of CNCs and CNFs films, respectively. Thus, the type of nanostructure, the way they interact to each other, the cellulose source and the process interfere significantly on the properties of the films.
Polimeros-ciencia E Tecnologia | 2016
Barbara Rani-Borges; Adriano Uemura de Faria; Adriana de Campos; Suely Patricia Costa Gonçalves; Sandra Mara Martins-Franchetti
There is considerable concern about the impact plastic materials have on the environment due to their durability and resistance to degradation. The use of pro-oxidant additives in the polymer films could be a viable way to decrease the harmful effects of these discarded materials. In this study, films of PHBV/PP-co-PE (80/20 w/w) and PHBV/PP-co-PE/add (80/19/1 w/w/w) (with pro-oxidant additive) were employed to verify the influence of the additive on the biodegradation of these films in the soil. These films were obtained by melting the pellets in a press at 180 °C which were buried in soil columns for 3 and 6 months. Some samples were also heated before being buried in soil. The biodegradation is higher for the additive blend buried for 3 months than for the pre-heated blend. After 6 months the blend buried and heated/buried was completely degraded in soil. The effect of the additive, on chain oxidation, is more time-dependant than heat-dependant.
Cellulose | 2013
Adriana de Campos; Ana Carolina Corrêa; David Cannella; Eliangela de Morais Teixeira; José Manoel Marconcini; Alain Dufresne; Luiz H. C. Mattoso; Anand R. Sanadi
Polymer Degradation and Stability | 2012
Adriana de Campos; José Manoel Marconcini; Sandra Mara Martins-Franchetti; Luiz H. C. Mattoso
Polimeros-ciencia E Tecnologia | 2011
Kelcilene B. R. Teodoro; Eliangela de Morais Teixeira; Ana Carolina Corrêa; Adriana de Campos; José Manoel Marconcini; Luiz H. C. Mattoso
Journal of Polymers and The Environment | 2013
Adriana de Campos; Gustavo Henrique Denzin Tonoli; José Manoel Marconcini; Luiz H. C. Mattoso; Artur P. Klamczynski; Kay S. Gregorski; Delilah F. Wood; Tina G. Williams; Bor-Sen Chiou; Syed H. Imam
Journal of Thermal Analysis and Calorimetry | 2014
Vitor Brait Carmona; Adriana de Campos; José Manoel Marconcini; Luiz H. C. Mattoso
Polymer Engineering and Science | 2013
Adriana de Campos; Kelcilene B. R. Teodoro; Eliangela de Morais Teixeira; Ana Carolina Corrêa; José Manoel Marconcini; Delilah F. Wood; Tina G. Williams; L. H. C. Mattoso