A5075020077- Polymer Nanocomposite Synthesis and Irradiation
- Polymer crystallization and properties
- Polymer Science and PVC
- Polymer Nanocomposites and Properties
- Conducting polymers and applications
- biodegradable polymer synthesis and properties
- Advanced Sensor and Energy Harvesting Materials
- Thermal and Kinetic Analysis
- Photopolymerization techniques and applications
- Recycling and Waste Management Techniques
- Material Properties and Applications
- Microplastics and Plastic Pollution
- Analytical Chemistry and Sensors
- Graphene research and applications
- Silicone and Siloxane Chemistry
- Electrospun Nanofibers in Biomedical Applications
- Nanotechnology research and applications
- Advanced Cellulose Research Studies
- Agricultural and Food Sciences
- TiO2 Photocatalysis and Solar Cells
- Phase Change Materials Research
- Organic Electronics and Photovoltaics
- Structural and Chemical Analysis of Organic and Inorganic Compounds
- Nanocomposite Films for Food Packaging
- Advancements in Battery Materials
Universidade Federal de Pernambuco
2012-2025
Universidade Federal Rural de Pernambuco
2005-2012
University of Toronto
2000
A novel, efficient, and cost-effective coating method was developed for fabricating highly conductive cotton yarn loaded with reduced graphene oxide (rGO). This is straightforward, rapid, scalable, amenable to solution processing. The key innovation involves pretreating the chicken egg albumin (CEA) before applying rGO through a simple dip-and-dry process. significantly reduces electrical resistance of yarn, achieving an optimal specific 80 Ω.g/cm2 just five cycles. Additionally, coated...
Abstract Poly(methyl methacrylate) (PMMA) is a polymer that can be used in applications requiring its exposition to gamma radiation, nevertheless, the radiation induces main chain scission backbone, leading modification some properties. Therefore, using materials such as layered double hydroxide (LDH), was evaluated new shielding agent. This work synthesized LDH and added PMMA by an in-situ polymerization method. Viscosimetric analysis showed at 0.25 wt% concentration promotes radiolytic...
Poly (methyl methacrylate) (PMMA)/Polyaniline nanofibers composite films were prepared by solution casting. Doped polyaniline self-assembled (PANFs) synthesized interfacial polymerization performed in an aqueous HCl/dichloromethane biphasic system the presence of ammonium peroxydisulfate as oxidant agent. Sodium dodecyl sulfate (SDS) was added to organic phase order verify possible modification morphology nanostrucutures when compared with previous reports. Treatment ultrasonic bath PANFs on...
Poly(3-hydroxybutyrate) is a biodegradable polyester produced by microorganisms under nutrient limitation conditions.We obtained poly(3-hydroxybutyrate) composite having 8 to 55% of chemically in situ polymerized hydrochloric acid-doped polyaniline nanofibers (70-100 nm diameter).Fourier transform infrared spectroscopy and X-rays diffractometry data did not show evidence significant interaction between the two components nanocomposite, semiconductivity was preserved all studied...
Lead (II) sulfide (PbS) were synthesized by sonochemical method and crystals with cubic structure exhibit aggregated nanoparticles size in the range of 50-100 nm. Commercial Poly(methyl methacrylate) (PMMA) containing PbS (PbS-NP) exposed to gamma irradiation investigated both viscosity-average molar mass (Mv) degradation index (DI) values measured. Ours results showed decreases when systems irradiated, i. e., random scission effects that take place main chain. On other hand, DI addition...
Poly(vinyl chloride) (PVC) is considered one of the most versatile polymers due to its interaction with different additives. On other hand, binary sulfides have wide applications as zinc sulfide (ZnS), first discovered semiconductors. This study aims synthesize a nanocomposite material containing nano ZnS in PVC matrix surfactant compatibilizer agent evaluate optical and electrical properties when exposed gamma radiation. Our results showed that adding at 0.5 wt% concentration promoted...
Zinc sulfide (ZnS) was synthesized by sonochemical method and nanoparticles with crystallite size around 2 nm were obtained. PVC containing ZnS at concentrations of 0.10; 0.30; 0.50; 0.7 1.00 wt% gamma irradiated (60Co) room temperature in air. No appreciable decrease Viscosity-Average Molar Mass (Mv) observed for samples nanocrystals. It demonstrated that the addition nanocrystals imparted molecular protection to polymer matrix while improving flexibility, decreasing Young Modulus films....
Extrinsic electrically conducting polymer composites are versatile materials for applications in sensors, electrical components, antistatic coatings, among others. The use of carbon‐based loads, such as graphene, nanocomposites allows the manufacturing suitable films a variety applications. In our work, graphene sheets covalently modified with histidine, phenylalanine, or beta ‐alanine aminoacids, order to improve dispersion and impart extrinsic conductivity poly(vinyl alcohol) (PVA) films....
Journal Article Radiation Induced Effects on Electrical Properties of Polyaniline Get access W.M. de Azevedo, Azevedo Search for other works by this author on: Oxford Academic PubMed Google Scholar A.P. da Costa Lima, Lima E.S. Araujo Protection Dosimetry, Volume 84, Issue 1-4, 1 August 1999, Pages 77–82, https://doi.org/10.1093/oxfordjournals.rpd.a032802 Published: 01 1999
Abstract Commercial Poly(methyl methacrylate) (PMMA) containing Tinuvin 622, a Hindered Amine Stabilizer (HAS), in 0.3% (wt/wt) concentration was investigated. The samples were irradiated with gamma radiation ( 60 Co) at room temperature air. viscosity‐average molecular weight M v ) analyzed by viscosity technique. Both control PMMA (without HAS) and + 622 (with showed decrease the increase dose, reflecting random scissions that occurred main chain. G value (scissions/100 eV of energy...
Abstract The refractive index (RI) and Fourier transform infrared (FTIR) spectrum of a poly(vinyl chloride) (PVC)/polystyrene (PS) mixture were measured. variation RI with the composition was found to be nonlinear, which indicated immiscibility PVC/PS mixture. This result agrees results obtained by FTIR technique, negligible intermolecular interactions between components, miscibility polymer limited for compositions studied. compared viscosity method criteria based on interaction parameters...
Brazilian poly(3-hydroxybutyrate), P(3-HB), and its copolymer, poly (3-hydroxybutyrate-co-3-hydroxyvalerate), P(3-HB-co-3-HV) were irradiated with gamma radiation (60Co) at room temperature in the presence of oxygen. The viscosity-average molar mass (Mv) was analyzed by viscometry using an Ostwald-type capillary viscometer. Both polymers showed a decrease increase dose, reflecting that random main chain scissions occurred. value G (scissions/100 eV energy transferred to system) parameter α...
Abstract O ‐Acylamidoxime and 1,2,4‐oxadiazole derivatives were synthesized from adamantanecarbonyl chloride 1 a diversity of arylamidoximes 2 a‐k . First, ‐acylamidoximes intermediates 3 subsequent cyclization under microwave irradiation afforded 1,2,4‐oxadiazol 4 Molar Heat Reaction Calorimetry studies performed revealed influence the substituent groups. A one‐pot two‐step methodology was also developed proving to be viable protocol. Compounds characterized by H 13 C Nuclear Magnetic...