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Tsocheva, D.; Zlatkov, T.

doi:10.1023/a:1010146619792

Cited by 26 publications

(22 citation statements)

References 25 publications

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“…15,16 We can conclude that the calorimetric behavior of the complexes formed with each of the latexes tested here showed no appreciable differences compared to the curves obtained for each sunscreen alone. Examination of the particles with SEM showed that the polymer particles were altered by the complexation with the active principle.…”

Section: Calorimetric Analysismentioning

confidence: 54%

Calorimetric, electrophoretic, and microscopic characterization of polymer–drug complexes

et al. 2008

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The preparation of polymer–drug complexes is one of the techniques used to obtain modified release formulations for use in different pharmaceutical forms. In this study, we prepared complexes with four commercially available latexes of different characteristics and two photoprotectors to determine the calorimetric, electrophoretic, and microphotographic characteristics of the complexes. The findings shed light on the interactions between the different polymers and drugs and on the differences between complexes as a result of differences in particle size. © 2008 Wiley Periodicals, Inc. Adv Polym Techn 27:47–55, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/adv.20119

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Section: Calorimetric Analysismentioning

confidence: 54%

Calorimetric, electrophoretic, and microscopic characterization of polymer–drug complexes

et al. 2008

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“…26 Its nature needs further investigations, but most probably it can be related to a postpolymerization process suggested in previous articles. 38,39 As seen in Figure 1, it is well manifested for PANI-EB and becomes less pronounced for PMANI-EB.…”

Section: Resultsmentioning

confidence: 94%

“…[22][23][24][25] The water evaporation during the calorimetric study results in a broad endothermic peak, often masking the registration of relaxation transitions. 26 Thus, preliminary removal of the absorbed water appears to be obligatory. In the homopolymers studied, the water content, as determined by the equation given in the Experimental part, varies between about 4.4 wt % for PANI-EB and about 3.1 wt % for PMANI-EB, both heated directly up to 3508C.…”

Section: Resultsmentioning

confidence: 99%

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Copolymers of aniline and o‐methoxyaniline. II. Thermoanalytical studies

Tsocheva¹,

Mokreva²

2007

J of Applied Polymer Sci

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A study on the thermal stability, thermodynamical parameters, especially relaxation transition temperature (T g ), and their change upon irreversible reactions (crosslinking, postpolymerization, decomposition, etc.) taking place on heating of the undoped homo-and copolymers of aniline and omethoxyaniline was performed by using differential scanning calorimetry. It was found that polyaniline and its oligomers might be responsible for the postpolymerization process observed on heating thermograms of the polymers in their emeraldine base form. It can be stated that the proceeding of this process appears to be a reason for the higher thermal stability of polyaniline when compared with poly(o-methoxyaniline).

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“…It is remarkable that more than 50% of the initial mass is preserved for temperatures up to 500 C. This residual mass corresponds to the presence of reticule polymer which is formed at high temperatures. 31 …”

Section: Thermogravimetry Analysis (Tga)mentioning

confidence: 99%

Influence of Dibenzoyl Tartaric Acid on the Electrical Performances of the Polyaniline

et al. 2009

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In this study, the dibenzoyl-L-tartaric acid (DBTA) was used as doping agent to synthesis polyaniline (PANI) by direct oxidative polymerization of a chiral aniline monomer repeat unit. The influence of DBTA on the electrical performances of the polyaniline was studied with the synthesis conditions, particularly the molar ratio of DBTA to aniline and the presence of methanol. The spectral characterization (FT-IR and UV-visible-NIR), the thermal (TGA), electrical properties at macroscopic scale (I-V, C-V curves and the gap) and the morphology of the PANI have been investigated. From the results it's found that synthetic conditions have a great influence on the electrical properties of PANI-DBTA. In addition polyaniline micro-fibres can be obtained when using methanol as a solvent of DBTA. [11][12][13][14][15] and circular polarized electroluminescence (CPEL). [16][17][18] This kind of polymer had the easier ability to give oxidizing and reducing states with colour changes, and the possibility to exchange the physicochemical characteristics with the temperature, pH, and the electric potential. Currently, chiral polyaniline is studied in the literature by different methods like the enantio-selective electropolymerisation of aniline in the presence of (1S) by direct oxidative polymerization of a chiral unit of aniline monomer 22 and by an enzymatic method for production of optically active polyaniline. 23 In the literature it's confirmed that the electronic properties of PANI depends on the degree of protonation and the method of synthesis. 24 Moreover, the work carried out on polyaniline doped by DBTA is based only on the optical properties, 25,26 where the majority of works gave the electric properties of the chiral polyaniline by using an acid containing a sulphonic function and according to Zhang et al.,27 it was reported that the variation of the concentration of the doping agent influences the electric and optical properties of the polyaniline.The aim of this work is to study the electrical behaviour of the polyaniline doped by a chiral acid containing a carboxylic function. The polyaniline was synthesised by direct oxidative polymerization of aniline monomer repeat unit using dibenzoyl tartaric acid (DBTA) as a dopant. The morphology, thermal, spectroscopic and electrical properties of PANI-DBTA were investigated.The DBTA has been chosen here because it has two asymmetrical carbons which confer an optical activity of the polarization plan for the monochromatic light. The optical rotation of DBTA measured in our laboratory at 20 C is À107to À113 in methanol. EXPERIMENTAL ProductsThe products used in this work such as Methanol 99.8%, Aniline 99%, DBTA 99%, ethanol 96%, chloroform 99% are from FLUKA and ammonium peroxydisulfate 99% is from PROLABO. They were all used without purification. Synthesis of PANI-DBTAThe PANI was synthesized by chemical oxidation of aniline, with the ammonium persulfate {(NH 4 ) 2 S 2 O 8 } as oxidant and the (2, 3) di-benzoyl-L-tartarique acid (DBTA) as dopant.In a glass reactor with ...

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Untitled

Cited by 26 publications

References 25 publications

Calorimetric, electrophoretic, and microscopic characterization of polymer–drug complexes

Calorimetric, electrophoretic, and microscopic characterization of polymer–drug complexes

Copolymers of aniline and o‐methoxyaniline. II. Thermoanalytical studies

Influence of Dibenzoyl Tartaric Acid on the Electrical Performances of the Polyaniline

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