Commercial epoxy resin loaded with phosphorus flame retardant led to composites exhibiting remarkable improved retardancy and thermal stability.

The aim of the present study was to obtain high-performance materials for heat and flame protective clothing. Therefore, hybrid membranes were prepared using Kevlar as support aromatic polyimide nanofibers a coating. exceptional performances highlighted by selected indicators: high thermal stability, fire resistance improvement in air permeability without modifying drastically water vapor transmission rate properties. Attenuated total reflectance Fourier transform infrared 1 H nuclear...

In this study, we aim to obtain biomaterials with antibacterial properties by combining poly(vinyl alcohol) the extracts obtained from various selected plants Romania. Natural herbal of freshly picked flowers lavender plant (Lavandula angustifolia) and leaves peppermint (Mentha piperita), hemp (Cannabis sativa L.), verbena (Verbena officinalis) sage (Salvia officinalis folium) were after an intensive analyzing diverse medicinal often used as healing agents country flora. The characterized...

New fire resistant epoxy resins were prepared. The kinetic processing of thermogravimetric data was performed using Friedman and Vyazovkin methods.

The current study focuses on the application of cytotoxicity tests upon one membrane matrix based electrospun polyimide fibers, appealing for biomedical application, such as scaffolds cell growth, patches or meshes wound healing, etc. Assays were performed in order to determine viability and proliferation L929 murine fibroblasts after they kept direct contact with studied fibers. Increased detected cells seeded fibers membrane, comparison control system, either two six days evaluation....

While plastics are regarded as the most resourceful materials nowadays, ranging from countless utilities including protective or decorating coatings, to adhesives, packaging materials, electronic components, paintings, furniture, insulating composites, foams, building blocks and so on, their critical limitation is advanced flammability, which in fire incidents can result dramatic human fatalities irreversible environmental damage. Herein, epoxy-based composites with improved flame-resistant...

In recent years, multidrug-resistant bacteria have developed the ability to resist multiple antibiotics, limiting available options for effective treatment. Raising awareness and providing education on appropriate use of as well improving infection control measures in healthcare facilities, are crucial steps address crisis. Further, innovative approaches must be adopted develop novel drug delivery systems using polymeric matrices carriers support efficiently combat such thus promote wound...

Essential oil of Nepeta racemosa Lam. was extracted and characterized to determine its antimicrobial activity potential use in applications. The essential loaded on polyvinyl alcohol-pullulan films gels by optical microscopy, scanning electron UV-Vis spectroscopy before having capacities assessed. from using gas chromatography coupled with mass spectroscopy, which indicated that the most abundant component nepetalic acid (55.5%), followed eucalyptol (10.7%) other compounds concentrations...

This study presents the synthesis and characterization of polyimide (PI-2) films incorporated with spirulina powder for potential biomedical applications. The PI-2 was achieved through a two-step polycondensation reaction using N-methyl-2-pyrrolidone (NMP) as solvent. incorporation systematically varied to investigate its effects on structural surface properties hybrid materials. Scanning electron microscopy revealed tightly bound interface between matrix, indicating effective dispersion...

In this paper, hydroalcoholic solutions of Thymus vulgaris, Salvia officinalis folium, and Hyperici herba were used in combination with poly (vinyl alcohol) the aim developing novel alcohol)-based nanofiber mats loaded phytotherapeutic agents via electrospinning technique. The chemical structure morphology polymeric nanofibers investigated using Fourier Transform Infrared Spectroscopy (FTIR) Scanning Electron Microscopy (SEM). addition extracts to pure polyvinyl alcohol fibers led changes a...

One of the most versatile techniques to fabricate micro-/nanoscaled nonwoven fibrous materials is represented by electrospinning. Due its easy availability and versatility, increasing efforts worldwide have focused on preparation natural and/or synthetic composite membranes that eventually mimic artificial extracellular matrix. Electrospun based copoly(ether imide)s derived from Jeffamine, additionally doped with silver-loaded zeolite L nanoparticles (ze-Ag+), been successfully produced in...

Abstract The preparation of a novel polyphosphonate (PSFR) is described here, starting from phenylphosphonic dichloride and an equimolecular mixture containing equal amounts two bisphenols, namely 4,4′‐dihydroxydiphenyl sulfone 2‐(6‐oxido‐6H‐dibenzo<c,e><1,2>oxaphosphorin‐6‐yl)‐1,4‐benzenediol, following the polycondensation reaction in solution. Then, new environmental‐friendly nanocomposites having improved flame retardancy have been prepared by incorporating PSFR halloysite...

Abstract A series of novel phosphorus‐containing polyesterimides were prepared from diols—a mixture a new aromatic bisphenol, namely 1,4‐bis[ N ‐(4‐hydroxyphenyl)phthalimidyl‐5‐carboxylate]‐2‐(6‐oxido‐6H‐dibenz<c,e><1,2>oxaphosphorin‐6‐yl)‐naphtalene, with aliphatic diols such as 1,3‐propanediol, 1,4‐butanediol, 1,5‐pentanediol, 1,6‐hexanediol, and 1,12‐dodecanediol—and an diacid chloride containing two preformed ester groups, terephthaloyl‐bis‐(4‐oxibenzoyl‐chloride), via...

Abstract A series of thermotropic liquid crystalline aliphatic–aromatic copolyesters derived from various ratios dodecane‐1,12‐diol ( 1 ), terephthaloyl bis‐(4‐oxybenzoyl‐chloride) 2 and 2‐(6‐oxido‐6H‐dibenz〈 c , e 〉〈1,2〉 oxaphosphorin‐6‐yl)‐1,4‐naphthalene diol 3 has been synthesized. The chemical structures the monomers polymers have confirmed by elemental analyses, FT‐IR H NMR spectroscopy. mesomorphic properties investigated differential scanning calorimetry, polarizing optical...

Two analogous polyimides (PIs) containing flexible isopropylidene units were prepared. One was based on 4,4′-oxydiphthalic anhydride and 4,4′-(4,4′-isopropylidenediphenyl-1,1′-diyldioxy) dianiline the other 4,4′-(4,4′-isopropylidenediphenoxy) bis(phthalic anhydride) bis(3-aminophenyl) methyl phosphine oxide. The ability of these two PIs to form uniform nanoscaled fibers investigated by electrospinning technique. At optimal spinning conditions, PI electrospun onto surface woven poly(ethylene...

Submicron fibers based on phosphorus-containing polyimide were successfully prepared and characterized for their thermal properties.

The design of hydrogel networks with tuned properties is essential for new innovative biomedical materials. Herein, poly(vinyl alcohol) and xanthan gum were used to develop hydrogels by the freeze/thaw cycles method in presence oxalic acid as a crosslinker. structure morphology obtained investigated means scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, swelling behavior. SEM analysis revealed that surface was mostly affected blending ratio between two...

Eco-innovation through the development of intelligent materials for food packaging is evolving, and it still has huge potential to improve product safety, quality, control. The design such by combination biodegradable semi-synthetic polymers with natural ones some additives, which may certain functionalities in targeted material, continuing attract attention researchers. To fabricate composite films via casting from solution, followed drying atmospheric conditions, mass ratios poly(vinyl...

The development of intelligent materials for protective equipment applications is still growing, with enormous potential to improve the safety personnel functioning in specialized professions, such as firefighters. design and production by chemical modification biodegradable semisynthetic polymers, accompanied modern manufacturing techniques electrospinning, which may increase specific properties targeted material, continue attract interest researchers. Phosphorus-modified poly(vinyl...