This article investigates the relationship between corporate social responsibility and earnings management. Using panel data methodology for a sample of Spanish non-financial companies 2005 2012, we find negative impact practices on Corporate is related to ethical moral issues concerning decision-making. Engaging in socially responsible activities not only improves stakeholder satisfaction, but also has positive effect reputation. The results show that may be an organizational device leads...

In this research, the presence of microplastics was detected through a differential scanning calorimetry (DSC) analysis three wastewater treatment plants. One these plants applied only preliminary stage while others up to secondary evaluate their effectiveness. The results showed polyethylene (PE), polystyrene (PS), polypropylene (PP) and terephthalate (PET), which were classified as fragments, fibers or granules. During evaluation plants, it determined that did not remove more than 58%...

Biodegradable biopolymers from species of the animal kingdom or their byproducts are sustainable as ecological materials due to abundant supply and compatibility with environment. The research aims obtain a biodegradable active material chitosan, gelatin, collagen bocachico scales (Prochilodus magdalenae). Regarding methodology, films were developed magdalenae) at different concentrations using glycerol plasticizer citric acid cross-linker. obtained hydrated mass processed by compression...

The environment presently contains greater amounts of heavy metals due to human activities, causing toxicity, mutagenicity, and carcinogenicity. This study evaluated a chitosan (CS) composite material combined with 1,3-dichlorocetone extract from affected waters, integrating experimental computational analyses. synthesis chitosan, obtained shrimp waste chitin, reached yield 85%. FTIR analysis confirmed key functional groups (NH2 OH), XRD showed high crystallinity peaks at 2θ = 8° 20°....

The degradation of polystyrene (PS) represents a significant challenge in plastic waste management due to its chemical stability and low biodegradability. In this study, the catalytic mechanisms PS were investigated by density functional theory (DFT)-based calculations using hybrid B3LYP 6-311G++(d,p) basis Gaussian 16. influence acidic (AlCl3, Fe2(SO4)3) basic (CaO) catalysts was evaluated terms activation energy, reaction mechanisms, products. results revealed that acid induce...

Completely biobased and biodegradable thermoplastic starch (TPS) based materials with a tunable performance were prepared for food packaging applications. Five blends by blending TPS 10 wt%. of different pine resins derivatives: gum rosin (GR), disproportionated (RD), maleic anhydride-modified (CM), pentaerythritol ester (LF), glycerol (UG). The characterized in terms thermo-mechanical behavior, surface wettability, color performance, water absorption, X-ray diffraction pattern,...

Abstract Natural antioxidants are added in very low amounts to protect a polypropylene (PP) matrix against thermo‐oxidative degradation during processing. Thus, PP is melt‐blended with caffeic, chlorogenic, trans‐ferrulic, and p ‐coumaric acids, also flavone 3‐hydroxyflavone at 0.1 wt% respect the matrix. Neat blended three traditional prepared for comparison. A complete structural, thermal, mechanical characterization conducted. Ferrulic acid particularly caffeic increases thermal...

Sulfur compounds are removed from propylene through purification processes. However, these processes not 100% effective, so low concentrations of such as H2S may be present in polymer-grade propylene. This article studies the effects content on polypropylene polymerization controlled dosage this compound with between 0.07 and 5 ppm its monitoring during process to determine possible reaction mechanisms evaluate variations properties material by TGA, FTIR, MFI, XDR analysis. It was found that...

For the synthesis of polymeric resins, it is great importance to review raw materials and equipment be used avoid presence compounds that may affect effectiveness polymerization characteristics plastic obtained. Iron oxide a compound can present in reactors after maintenance due techniques cleaning this equipment, reducing their quality. In study, FeO different concentrations was evaluated determine its effects on properties pyrolysis polypropylene resins by using X-ray refraction elements...

This article studies the effects of arsine on synthesis and thermal degradation 4 samples virgin polypropylene (PP-virgin) proposes reaction mechanisms that allow understanding its behaviour. Different points are monitored during to perform TGA, DSC, FT-IR, RDX, MFI analyses later. The content AsH3 in varies between 0.05 4.73 ppm, arsenic PP residues 0.001 4.32 ppm for PP0 PP10, increasing fluidity index from 3.0 24.51. origin thermo-oxidative is explained by Molecule with active titanium...

Microplastic (MP) contamination has become a problem of great interest to the community at large. The detection these particles in different ecosystems and foods been subject study. However, focus investigations on identification quantification PM by DSC Pyr-GC/MS not how they are transported reach air we breathe. In this study, values morphological parameters for plastic range between 1 2000 µm, present breathable 20 neighborhoods city Cartagena, Colombia, were obtained determine...

Every year the world loses about 50% of fruits and vegetables post-harvest in supply chain. The use biodegradable coatings films with antioxidant properties has been considered an excellent alternative to extend shelf life food. Therefore, objective this work was develop a coating based on yam (Dioscorea rotundata L.) starch-containing lime, fennel, lavender essential oils strawberries (Fragaria vesca l.). tensile properties, barrier (water vapour permeability (WVP) oxygen (OP)), moisture...

During the production of polymer-grade propylene, different processes are used to purify this compound and ensure that it is highest quality. However, some impurities such as acetylene methyl difficult remove, these may be present in propylene obtain polypropylene, which have repercussions on process. This study evaluates impact productivity polypropylene synthesis process mechanical thermal properties material obtained through eight samples with concentrations acetylene. We discovered for...

The copolymer synthesis process can be affected by failures in the production or contaminating compounds such as ketones, thiols, and gases, among others. These impurities act an inhibiting agent of Ziegler–Natta (ZN) catalyst affecting its productivity disturbing polymerization reaction. In this work, effect formaldehyde, propionaldehyde, butyraldehyde on ZN way which it affects final properties ethylene-propylene is presented analyzing 30 samples with different concentrations mentioned...

The addition of polymers in construction is a new tendency and an important step toward the production structures with better functional properties. This work investigates polyurea (PU) as polymeric material mortars. Polymer mortars were manufactured retained different sieves (T50 T100) concentrations (2% 5%). characterization the, (PU)control mortar (PU0%) (PU2%T50, PU5%T50, PU2%T100, PU5%T100) was conducted by means morphological analysis, SEM, XRF, TGA, compressive strength test hydraulic...

Because of its toxicity and impacts on the environment human health, bisphenol A (BPA) has been controlled in numerous industrialized nations, increasing demand for analogues (BP) replacement. However, consequences these chemicals health persons exposed to their emissions are still being researched. The from polypropylene manufacturing facilities Colombia Brazil were evaluated this study, presence four BPs was detected among gaseous compounds released, with total concentrations (∑BP) between...

Phosphorus contamination in water bodies is a major contributor to eutrophication, leading algal overgrowth, oxygen depletion, and ecological imbalance. Conventional treatment methods, including chemical precipitation synthetic adsorbents, are often limited by high operational costs, low biodegradability, secondary pollutant generation. In this study, cationic starch was synthesized through free radical graft polymerization of 3-methacrylamoylaminopropyl trimethyl ammonium chloride (MAPTAC)...

This study analyses the effect of lignin extracted from Dominico-Harton banana on physicochemical properties biodegradable methylhydroxyethylcellulose (MHEC) composites. Lignin was obtained by grinding and sieving, followed treatment with sulphuric acid subsequent separation via centrifugation. Films were developed using casting method, incorporating glycerol in a matrix MHEC dissolved distilled water. They characterised according to their physical, barrier, mechanical, optical, antioxidant...