Thermal behavior of the copolymers based on styrylphosphonic acid

The main property of copolymers containing phosphonic acid group at side chain is the proton conductivity, therefore there copolymers have strong metal complexation properties, due to the presence of phosphonic group. The copolymers of styrylphosphonic acid and acrylic monomer at different molar ratios were synthesized by thermal polymerization and charcterized by FTIR, thermal analysis and ionexchange capacity. The copolymers present good ion-exchange capacity and can be used as potential ion exchangers

Thermodynamics-Based Process Sustainability Evaluation

This article considers the problem of the evaluation of the sustainability of heterogeneous process systems, which can have different areas of focus: from single process operations to complete supply chains. The proposed method defines exergy-based concepts to evaluate the assets, liabilities, and the exergy footprint of the analysed process systems, ensuring that they are suitable for Life Cycle Assessment. The proposed concepts, evaluation framework and cumulative Exergy Composite Curves allow the quantitative assessment of process systems, including alternative solutions. The provided case studies clearly illustrate the applicability of the method and the close quantitative relationship between the exergy profit and the potential sustainability contribution of the proposed solutions. The first case study demonstrates how the method is applied to the separation and reuse of an acetic-acid-containing waste stream. It is shown that the current process is not sustainable and needs substantial external exergy input and deeper analysis. The second case study concerns Municipal Solid Waste treatment and shows the potential value and sustainability benefit that can be achieved by the extraction of useful chemicals and waste-to-energy conversion. The proposed exergy footprint accounting framework clearly demonstrates the potential to be applied to sustainability assessment and process improvement while simultaneously tracking di erent kinds of resources and impacts

Mass-spectrometry used in characterization of pigments

Naphthol AS pigmens synthesised by RPTC were characterized by M2 mass spectrometry. The rezults show that this technique is not very a reliable method for characterization of such compounds

Acyclic directed graphs based on residue curves for feasability analysis

Residue curve maps (RCMs) provide a rapid and graphical way to visualize the feasibility of separation, taking into account the azeotropic constraints and boundaries. Unfortunately, due to its graphical nature, they are mainly used for azeotropic ternary systems. RCM represents the composition column profiles for distillation units operated at infinite reflux flow rate. When checking the feasibility, the present paper proposes to use acyclic directed graphs since the column profile of compositions are not so relevant compared to the singular points joined by them

Polyester resin coatings as barrier against aggressive agents : influence of volumetric pigment concentration

In this paper we present experimental results of electrochemical measurements (EIS and anodic polarization) on the performance of polyester copolymers films obtained at the various volumetric pigment content (VPC)

Electrochemical synthesis of poly-3-aminophenylboronic acid in sulfuric acid solution

Sensors based on the complexation of boron groups with diols are an attractive alternative to detection of biologic compounds in particular dopamine. The electropolymerisation of 3- aminophenylboronic acid (APBA) in aqueous solutions on Pt electrodes has been investigated. The obtained poly-3-aminophenylboronic acid is used for the potentiometric detection of dopamine

Polyaniline - morphology and sensing properties

The adsorption process of dye on polyaniline films electrodeposited on niobium has been investigated using electrochemical impedance spectroscopy. ads value (- 35.802 kJ mol-1 ) and high value of Kads obtained in our measurements indicate that Amino Black 10 adye adsorption process is spontaneous with the formation of a stable adsorbed dye layer on the polyaniline surface. The adsorption takes place via a combination of physical and chemical adsorption