A5039701428- Chemical Synthesis and Characterization
- biodegradable polymer synthesis and properties
- Bone Tissue Engineering Materials
- Polymer Nanocomposites and Properties
- Silicone and Siloxane Chemistry
- Animal Ecology and Behavior Studies
- Wildlife Ecology and Conservation
- Flame retardant materials and properties
- Recycling and Waste Management Techniques
- Microplastics and Plastic Pollution
- Innovative concrete reinforcement materials
- Ecology and Vegetation Dynamics Studies
- Polyoxometalates: Synthesis and Applications
- Graphene and Nanomaterials Applications
- Fiber-reinforced polymer composites
- Dental materials and restorations
- Material Properties and Applications
- Layered Double Hydroxides Synthesis and Applications
- Evolution and Paleontology Studies
- Natural Fiber Reinforced Composites
- Advanced materials and composites
- Chemistry and Chemical Engineering
- Nanoparticles: synthesis and applications
- Tailings Management and Properties
- Heavy metals in environment
Universidade Federal do Rio de Janeiro
2009-2025
ABSTRACT In the pursuit of more sustainable practices within circular economy, estimation polymer contents in mixed plastic blends is essential. This study presents a simple method for determining polypropylene (PP) and polyethylene (PE) content heterogeneous mixtures recycled plastic. A calibration curve was developed using differential scanning calorimetry data, allowing rough estimations PP PE ratios. Seven PE/PP were analyzed, cross‐contamination polymers observed. Linear quadratic fits...
The spatial distribution of small mammals in relation to distance from forest edges, before and after fire, was studied Atlantic Forest fragments Brazil. None nine species captured exclusively on either edges or interior. Before the fire only rodents Akodon cursor Oecomys con-color were more often at edge than randomly expected. After A. remained associated with edges; it had increased number penetrated farther into fragments. marsupial Micoureus demerarae became restricted interior These...
Regarding environmental preservation, the upcycling of plastics from petroleum source is a consistent alternative. This work intended to investigate melting extruded composites post-consumer HDPE (rHDPE) filled with pristine zirconium phosphate (ZrP), aluminum hydroxide [Al(OH) 3 ] and modifying-zirconium [ZrPOct/Al(OH) ]. Physico-mechanical flame retardancy were assessed. FTIR revealed that rHDPE brought some degree oxidative degradation probably its cleaning process and/or processing. By...
In order to search nanofiller for controlling release of drugs lamellar α-zirconium phosphate (α-ZrP) was modified with ether-amine oligomer (E-A). Synthesis and chemical modification followed specific reaction conditions different EA:ZrP ratios. Infrared spectra showed strong interaction between P-OH NH2 groups. Thermogravimetric curves that incorporated by ZrP. Interlamellar space α-ZrP increased at least four times indicating intercalation. The relaxometry analysis indicated molecular...
The improvement of properties has been pursued through the addition an immense variety fillers in polymers. In this work we studied effect lamellar zirconium phosphate (ZrP) on physico-mechanical polyamide-6 (PA-6). ZrP was synthesized and incorporated into PA-6 matrix at 1, 2 3 wt.%. Structural, thermal, relaxometric, tensile, melt flow rheologic characteristics were assessed. Thermogravimetry indicated a low influence filler thermal stability. deconvolution melting peaks transformation α...
Polyamide-6/organointercalated zirconium phosphate nanocomposites (PA-6/ZrPOct) were prepared by melt extrusion. The synthesized lamellar ZrP was expanded with octadecylamine at different amine:phosphate ratio, and its influence evaluated tensile test, flow rate, water absorption, rheology, scanning electron microscopy, wide-angle X-ray diffraction. For all nanocomposites, the increase of modulus decrease elongation rupture observed. in uptake observed as amine/phosphate increase, indicating...
Tetravalent metal phosphates find application mainly as a catalyst and ionic exchangers besides structural some other properties. In this study, pristine zirconium phosphate (ZrP) chemically modified with Jeffamine™ (variable amine:phosphate ratio) were used fillers to yield polypropylene nanocomposites by melt extrusion. Additionally, two different screw speeds (60 120 rpm) carried out. Structural, crystallographic, thermal, dynamic-mechanical, relaxometry properties assessed. The...