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RISS 인기검색어
- 검색키워드
- 저자 : Francisco Maciel Monticeli (검색결과 2 건)
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Polyurethane Foam Reinforced with Fibers Pineaplle Crown Biocomposites for Sorption of Vegetable Oil
Isabella Loureiro Muller Costa,Francisco Maciel Monticeli,Daniella R. Mulinari 한국섬유공학회 2020 Fibers and polymers Vol.21 No.8
The concern in reducing the environmental impacts caused by human interference is increasing. Thus, theobjective of this study was to generate a sustainable solution for sorption of vegetable oil. It was developed and characterizedbiocomposites obtained from polyurethane derived from castor oil reinforced with fibers from the crown of pineapple forsorption of vegetable oil. The biocomposites were obtained by mass mixing the polyol with the prepolymer (1:1) andreinforced with 5 to 20 % (wt/wt) pineapple crown fiber in 18 and 35 mesh granulometry. The biocomposites and purepolyurethane were characterized by scanning electron microscopy (SEM), optical microscopy (OM), X-ray Diffraction(XRD), porosimetry, contact angle, and density. Sorption tests were carried out on the biocomposites and pure polyurethane(PU). The sorption capacity of the biocomposites was evaluated as a function of the fiber content inserted in the matrix. Results of the sorption tests showed that the biocomposites reinforced with fibers of 18 mesh (20 % wt) presentedapproximately twice the sorption capacity when compared to pure PU and others biocomposites results, due to high porositycombined with high surface area, which influenced directly in the oil sorption. Response surface methodology (RSM)tecnique confirmed the influence fibers granulometry and content on oil sorption.
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The Effect of Self-Healing Agent Fraction on CFRP Mechanical Behavior: Statistical Analysis Approach
Yuri Pereira Chuves,Francisco Maciel Monticeli,Allana Azevedo do Nascimento,Ana Paula Cysne Barbosa,Herman Jacobus Cornelis Voorwald,Maria Odila Hilário Cioffi 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2
The self-healing application in structural composites aims to recover component properties, control damage propagation,and increase component life. In this way, this study proposes to characterize and predict the inter-laminar shear behaviorof polymer composites (5HS carbon/epoxy) with different fractions of self-healing agent. In addition, this work aims tomeasure the influence of self-healing content on the mechanical response. The ANOVA evidenced that the healing agentfraction influences on mechanical properties more than the internal dispersion for the same laminate before the healingcycle. Weibull distribution evidenced a linear decrease in shear stresses for higher EMAA (poly(ethylene-co-methacrylicacid)) content, regarding stiffness decrease as a response to ductile thermoplastic behavior. Ineffective healing effects wereobserved for the translaminar and intra-laminar damage, once most particles were concentrated in inter-laminar sections. However, the healing efficiency reached an average of 62% for shear stress and 106% for toughness behavior, provided bythe closing shear cracks, i.e., up to 57% of reduced area related to the initial crack size. The predictive approach beforeand after healing action in the mechanical behavior provides the appropriate self-healing level to meet the specific projectrequirements, thus saving time and cost.
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