A5072200835- biodegradable polymer synthesis and properties
- Polymer composites and self-healing
- Polymer Nanocomposites and Properties
- Polymer crystallization and properties
- Drug Solubulity and Delivery Systems
- Advanced Polymer Synthesis and Characterization
- Lignin and Wood Chemistry
- Microencapsulation and Drying Processes
- Electrospun Nanofibers in Biomedical Applications
- Advanced Drug Delivery Systems
- Silicone and Siloxane Chemistry
- Dyeing and Modifying Textile Fibers
- Nanocomposite Films for Food Packaging
- Crystallization and Solubility Studies
- Layered Double Hydroxides Synthesis and Applications
- Conducting polymers and applications
- Carbon dioxide utilization in catalysis
- Pigment Synthesis and Properties
- Polyoxometalates: Synthesis and Applications
- Microplastics and Plastic Pollution
- Water Quality Monitoring and Analysis
- Enzyme-mediated dye degradation
- Dye analysis and toxicity
- Analytical Chemistry and Sensors
- Inorganic and Organometallic Chemistry
Universidade Federal do Paraná
2016-2025
Instituto Politécnico Nacional
2020
Centro Universitário Curitiba
2020
Braskem (Brazil)
2009
Universidade Federal do Rio de Janeiro
1993
Microparticles of poly(3-hydroxybutyrate- co -3-hydroxyvalerate) (PHBV) and poly( ε -caprolactone) (PCL) containing resveratrol were successfully prepared by simple emulsion/solvent evaporation. All formulations showed suitable encapsulation efficiency values higher than 80%. PHBV microparticles revealed spherical shape with rough surface presence pores. PCL spherically shaped smooth surface. Fourier-transformed infrared spectra demonstrated no chemical bond between polymers. X-ray powder...
One of the most used plastics in world is poly(ethylene terephthalate), PET, which on top list recyclable polymers. In this work, it was studied chemical recycling PET by alcoholysis reaction using diethylene glycol (DEG) and sodium metasilicate (NaMs) as catalyst. This catalyst not before for kind showed an activity good compound (zinc acetate). The PET‐polyol produced with conditions that higher weight yield final product polyurethane (PU) adhesives compositions. PUs were obtained...
Abstract Two series of poly(ester urethane)s were prepared, containing polycaprolactone (PCL) as the soft segment with molecular weights 530 and 2000. In each series, soft‐segment/hard‐segment ratio was varied, morphological changes monitored differential scanning calorimetry, dynamic mechanical thermal analysis, wide‐angle X‐ray scattering, electron microscopy techniques. The polyurethanes longer PCL segments retained their crystallinity, whereas those shorter did not. A model is proposed,...
Abstract This work studies the possibility of reusing flexible postconsumed polyurethane foams modified by grafting with polystyrene as a sorbent material for mitigation oil spills. Different were evaluated via crude sorption and retention experiments, density, morphological analyses. The best performance chemically under different conditions (initiator concentration, styrene volume, reaction time) in system initiated oxi‐reduction Ce(IV) from an amoniacal ceric nitrate solution. A...
Poly(3-hydroxybutirate-co-3-hydroxyvalerate) (PHBV) microparticles containing a water-soluble model drug, metformin hydrochloride (MH), were obtained by double emulsion/solvent evaporation technique. Several formulations prepared in order to investigate the influence of each composition on encapsulation efficiency (EE). The highest value EE (9.76%) was using simultaneously pH alkalinization and NaCl addition external water phase formulation. SEM study revealed spherical morphology rough...
Abstract In the present study, epoxidation and ozonolysis led to a decrease of 40.8 51.9 % in degree unsaturation corn oil, respectively. Both products were initially characterized by Fourier transform infrared spectroscopy 1 H‐ 13 C‐nuclear magnetic resonance spectroscopies. The heteronuclear single‐quantum correlation (HSQC) analysis polyol obtained showed that carbinol hydrogen signals, located between 3.65 3.47 ppm, correlated carbon signals 74.4 71.7 ppm. HSQC revealed these same...
This article aimed to improve the relative solubility and dissolution rate of ferulic acid (FA) by use spray-dried solid dispersions (SDs) in order ensure its vitro antioxidant potential enhance vivo anti-platelet effect. These SDs were prepared spray-drying at 10 20% drug concentration using polyvinylpyrrolidone K30 (PVP-K30), polyethylene glycol 6000 (PEG 6000) poloxamer-188 (PLX-188) as carriers. physical mixtures (PM) characterized SEM, XRPD, FTIR spectroscopy TGA analysis. Spray-dried...
Hydroxyl-terminated polybutadiene and tolylene diisocyanate were used to prepare two series of polyurethanes by a two-step process. In the first series, prepolymers chain-extended with aliphatic compounds (1,3-propanediol, 1,4-butanediol 1,6-hexanediol) in second, an aromatic chain extender (dihydroxy isopropyl-N-aniline) was used. Some results from mechanical testing showed different trends comparison previously reported for similar systems. These findings interpreted terms reactant...
A quaternary ammonium methacrylate polymer (QAMP) with antimicrobial potential was synthesized. The resulting product characterized by FTIR spectroscopy, NMR visible spectrophotometry, XRPD and TGA. in vitro susceptibility tests against Streptococcus mutans of QAMP were investigated prior after incorporation into a commercial adhesive system (Clearfil™ SE Bond). release compounds from the experimental Bond + 5% QAMP) performed during 1, 7, 14, 21 30 days. Spectroscopic data confirmed that...
Microparticles of poly(ε-caprolactone) (PCL) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) containing manidipine dihydrochloride (MAN) were successfully prepared by the simple emulsion/solvent evaporation method. All formulations showed loading efficiency rates greater than 80% average particle size less 8 μm. Formulations had spherical shape with smooth porous surface for PCL PHBV, respectively. According to Fourier-transform infrared spectroscopy, initial components not...
Abstract Two series of segmented polyurethanes were prepared with systematic variation in soft and hard segment length. The was constituted by polycaprolactone (PCL) blocks molecular masses 530 or 2000 the (HS) urethane blocks, a concentration that varied from 12% to 44% weight whole polyurethane. Morphological analyses indicated amount crystallinity copolymers strongly dependent on PCL molar mass content. longer segments (Mn=2000) semicrystalline, but those shorter (Mn=530) unable...
Polímeros sintéticos são largamente utilizados em diversos produtos devido às suas propriedades físicas, químicas e facilidade de transformação. O poli(cloreto vinila), conhecido como PVC, é um dos polímeros mais versáteis desenvolvidos pelo homem, grande utilidade para a sociedade moderna. Suas aplicações incluem: janelas, calhas chuva, revestimentos paredes, portas, papel parede, mangueiras, brinquedos, calçados, bolsas sangue tubos condução água. Em todas estas aditivos junto à resina...
Este trabalho descreve a importância e conveniência dos procedimentos multivariados de otimização experimental, destacando as vantagens aplicações sistemas planejamento fatorial que permitem avaliar simultaneamente o efeito um grande número variáveis, partir reduzido experimentos. Por meio exemplo prático é apresentada uma discussão do da interação entre variáveis estabelecimento ótimos verdadeiros na parâmetros experimentais envolvidos fotopolimerização metacrilato metila (MMA) comercial,...
A contaminação dos recursos hídricos é um maiores problemas ambientais da atualidade. Dentre as várias fontes poluidoras, destacam-se indústrias têxteis, por serem geradoras de grandes volumes efluentes, muitas vezes tratados maneira ineficiente. principal causa do grande impacto ambiental decorrente deste descarte a presença corantes, tais como os compostos tipo azo, que podem gerar subprodutos caráter carcinogênico e/ou mutagênico, ou base antraquinona, são muito resistentes à degradação...