A5068522844- biodegradable polymer synthesis and properties
- Advanced Cellulose Research Studies
- Electrospun Nanofibers in Biomedical Applications
- Nanocomposite Films for Food Packaging
- Bone Tissue Engineering Materials
- Additive Manufacturing and 3D Printing Technologies
- Lignin and Wood Chemistry
- Microplastics and Plastic Pollution
- Polysaccharides and Plant Cell Walls
- Silicone and Siloxane Chemistry
- Polymer crystallization and properties
- 3D Printing in Biomedical Research
- Transboundary Water Resource Management
- Reconstructive Surgery and Microvascular Techniques
- Natural Fiber Reinforced Composites
- Anorectal Disease Treatments and Outcomes
- Water Quality and Pollution Assessment
- Extraction and Separation Processes
- Electrohydrodynamics and Fluid Dynamics
- Carbon dioxide utilization in catalysis
- Pelvic and Acetabular Injuries
- Toxic Organic Pollutants Impact
- Surface Modification and Superhydrophobicity
- Tissue Engineering and Regenerative Medicine
- Membrane Separation Technologies
Universitatea Națională de Știință și Tehnologie Politehnica București
2021-2022
Institutul Naţional de Cercetare Dezvoltare pentru Chimie si Petrochimie
2015-2021
National Institute for Research and Development in Informatics - ICI Bucharest
2018-2021
National Institute for Research and Development in Environmental Protection
2016-2021
Institute for Research and Development
2016
Biodegradable blends and nanocomposites were produced from polylactic acid (PLA), poly(3-hydroxybutyrate) (PHB) cellulose nanocrystals (NC) by a single step reactive blending process using dicumyl peroxide (DCP) as cross-linking agent. With the aim of gaining more insight into impact processing methods upon morphological, thermal mechanical properties these nanocomposites, three different techniques employed: compression molding, extrusion, 3D printing. The addition DCP improved interfacial...
ABSTRACT The widespread application of poly(3‐hydroxybutyrate) (PHB) in the food packaging and biomedical fields has been hindered by its high brittleness, slow crystallization, poor thermal stability, narrow processing window. To overcome these limitations, a mixture biodegradable biocompatible plasticizers was used to modify PHB. Epoxidized soybean oil (ESO), acetyl tributyl citrate, poly(ethylene glycol) 4000 (PEG4000), 6000 (PEG6000) were tested improve PHB melt achieve balanced...
Submerged liquid plasma (SLP) is a new and promising method to modify powder materials. Up now, this technique has been mostly applied carbonaceous materials, however, SLP shows great potential as low-cost environmental-friendly cellulose. In work we demonstrate the modification of microcrystalline cellulose (MCC) by applying combined with ultrasonication treatments. The generated either in an inert (argon) or reactive (argon: oxygen argon:nitrogen) gas was used MCC dispersions water...
Biocompatible composites play a critical role as scaffolds in tissue engineering. Novel biocomposites made from poly(3-hydroxybutyrate) (PHB), polyhydroxyalkanoate (PHA) and bacterial cellulose (BC) different concentrations were prepared by solution casting their thermal mechanical behavior well biocompatibility was characterized. BC addition increased the stability of polymer matrix evidenced thermogravimetric analysis. The crystallinity PHB crystallization temperature decreased with PHA,...
Medium chain-length polyhydroxyalkanoates (mPHAs) are flexible elastomeric biopolymers with valuable properties for biomedical applications like artificial arteries and other medical implants. However, an environmentally friendly high productivity process together the tuning of mechanical biological mPHAs mandatory this purpose. Here, first time, a melt processing technique was applied preparation bionanocomposites starting from poly(3-hydroxyoctanoate) (PHO) bacterial cellulose nanofibers...
Bacterial cellulose (BC) with increased hydrophobicity is required for several applications including packaging. Surface functionalization of BC may provide good resistance to moisture, barrier properties or improved compatibility polymer matrices. For this purpose, chemical grafting in mild, eco-friendly conditions was carried out using different agents. membranes were surface functionalized vinyl-triethoxy silane (VS) 3-aminopropyl triethoxysilane (APS), by acylation and acrylation. The...
Significant advances in graphene-based materials have facilitated the development of various composites structures a diverse range industry sectors. At present, preparation graphene-added is mainly developed through traditional methods. However, recent years, additive manufacturing emerged as promising approach that enables printing complex objects layer-by-layer fashion, without need for moulds or machining equipment. This paper reviews most reports on photopolymerizable resins...
The inherent brittleness of poly(3-hydroxybutyrate) (PHB) prevents its use as a substitute petroleum-based polymers. Low molecular weight plasticizers, such tributyl 2-acetyl citrate (TAC), cannot properly solve this issue. Herein, PHB films were obtained using biosynthesized poly(3-hydroxyoctanoate) (PHO) and commercially available TAC toughening agents. strongly decreased the thermal stability up to 200 °C due loss low boiling point plasticizer, while minor was noticed at temperature for...
Bacterial cellulose nanofibers (BCNF), obtained by the mechanical disintegration of BC pellicles, were used without any surface treatment for fabrication poly(lactic acid) (PLA) nanocomposites a melt compounding process. The addition BCNF in different amounts improved both Young’s modulus and tensile strength PLA. A 22% increase these properties was observed nanocomposite with 2 wt.% nanofibers, due to network formed at this concentration characterized atomic force microscopy. also increased...
ABSTRACT Nanocomposite films for food packaging applications were developed using bacterial cellulose (BC) nanofibers in different amount a poly(vinyl alcohol)/starch (PVA/St) matrix. In search of better method to reduce the harmful ingredients packaging, obtained by mechanical defibrillation BC pellicles thus avoiding addition chemicals final material. Improved performances starting from just 1% PVA/St. Atomic force microscopy images showed uniform dispersion on surface nanocomposites. A...
In this work, cellulose nanofibers (CNF) were surface treated by plasma and grafted with poly(ethylene glycol)methyl ether methacrylate (PEGMMA) for increasing mechanical strength hydrophobicity. The characteristics of the sponges studied scanning electron microscopy, micro-computed tomography, Fourier transform infrared spectroscopy, which demonstrated successful modification. Plasma treatment applied to CNF suspension led advanced defibrillation, resulting (CNFpl) exhibited smaller wall...
The impact of armed conflicts can be direct and indirect, highlighted by population displacement casualties, infrastructure destruction, together with social economic hiatus, but also the movement air, water soil pollutants across regional national borders. There are numerous possible contamination sources bodies aquatic ecosystems that may appear during conflicts, including projectile composition, use chemical weapons, discharge untreated wastewater due to damage sewage lines or treatment...