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

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)

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

Adsorption of phenolic compounds from water on polymeric adsorbents with olefin groups

Removal and recovery of aromatic pollutants from water by solid adsorbents have been of considerable concern recently. In this paper, adsorption of phenolic compounds from aqueous solution onto a polymeric adsorbent with olefin groups at temperatures from 297 K was studied

Porphyrin based-systems for the detection of recoverable metals from Li-Ion batteries : mini-review

The collection and recycling of metals, especially heavy metals, from all types of batteries is a major requirement of European Countries. Market studies highlighted that in the rechargeable battery field, lithium batteries are environmental friendly alternatives to the more polluting Ni-Cd batteries. Although lithium is not expected to bioaccumulate and its human and environmental toxicity are low, one source of lithium with impact to the environment is spent lithium batteries, due to the large variety of Li salts incorporated in polymer electrolyte membranes. Concerning to cathode, new trends are based on nanostructured lithium iron and manganese phosphate. Whatever are the metals involved in the cathode of batteries (Co-NiMn-Fe) the problem of controlling the efficiency of metals recovery is implying the use of sensor devices. In this paper we are concerned on porphyrin -based sensor devices for the rapid and accurate detection of Li, Ni, Mn

T A I L O R E D ST A R -SHAPE B I O D E G R A D A B L E P O L Y ( L A C T I C A C I D )

S e r i e s o f C h e m i s t r y 1 9 ( 4 ) ( 2 0 1 0 ) 1 9 -26 T A I L O R E D ST A R -SHAPE B I O D E G R A D A B L E P O L Y ( L A C T I C A C I D ) G. polycondensation method, using as catalyst tin chloride, and phosphorus oxychloride or 2-amino-2-methyl-1,3-propandiol as core. The influence of molar ration and concentration of catalyst on molar masses was studied. Moderately high molecular weight and inherent viscosities values up to 0.60 dl/g were obtained

Lithium doped polyphosphoester composite

The effect of lithium triflate on the ionic conductivity of polyphosphoester composite was investigated by electrochemical impedance spectroscopy (EIS). The highest conductivity was obtained for membrane with 15% lithium salt. The ion transport is slow due to the aggregation tendency of ions for composite membrane with higher than 20% lithium salt. The conductivity of all membranes increases linear with the increase of the temperature and shows a thermally activated process

Anticorrosion property of vinylphosphonic acid-co-diethylvinylphosphonate copolymers obtained by UV curing

Copolymers of vinylphosphonic acid (VPA) with diethylvinylphosphonate (DEVP) at different molar ratio from 1:1 to 4:1 were synthesized by using ultraviolet light. The polymers are soluble in water. They are investigated as corrosion inhibitors for iron by using impedance spectroscopy. The best result regarding the anticorrosion property was obtained for copolymer VPA:DEVP 1:1, with an inhibition efficiency of 72%

Experimental Investigations of AlMg3 Components with Polyurethane and Graphene Oxide Nanosheets Composite Coatings, after Accelerated UV-Aging

The use of graphene (Gr) and its derivates graphene oxide (GO) showed that these materials are good candidates to enhance the properties of polyurethane (PU) coatings, especially the anticorrosion ones since graphene absorbs most of the light and provides hydrophobicity for repelling water. An important aspect of these multifunctional materials is that all these improvements can be realized even at very low filler loadings in the polymer matrix. In this work, an ultrasound cavitation technique was used for the proper dispersion of GO nanosheets (GON) in polyurethane (PU) resin to obtain a composite coating to protect the AlMg3 substrate. The addition of GON considerably improved the physical properties of coatings, as demonstrated by electrochemical impedance spectroscopy (EIS) analysis, promising improved anticorrosion performance after accelerated UV-ageing. Computational methods and Differential Scanning Calorimetry (DSC) measurements showed that GON facilitates the formation of additional bonds and stabilizes the PU structures during the ultraviolet (UV) exposure and aggressive attack of corrosive species. Limiting oxygen index (LOI) data reveal a slow burning behaviour of PU-GON coatings during UV exposure, which is better than PU alone