Investigation of mechanical and creep properties of polypyrrole by depth-sensing indentation

Uzun, Orhan; Başman, Necati; Alkan, Cemil; Kölemen, Uğur; Yılmaz, Fikret

doi:10.1007/s00289-010-0361-3

Cited by 13 publications

(14 citation statements)

References 26 publications

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“…Sodium ibuprofen is a large molecule with a single charge, when added into the PPy matrix acts as an additional ion dopant along with the sodium salicylate ions to balance the polymer charge. The size of the ibuprofen molecule however results in an increase in the gap between the polymer chains, reducing the strength of the attractive forces between them making polymer chain motion and deformation easier than IBU-free polymer films [15,17]. As previously shown vide supra, in the absence of ibuprofen, PPy films in SA media developed a uniform, compact, adherent, globular-like structure (Fig.…”

Section: Depth-sensing Indentationmentioning

confidence: 60%

“…The mechanical properties of the PPy films are dependent on the chemical structure, molecular size and dopant ion concentration [15,17]. To investigate the effect of ibuprofen in the For each sample, the 3 × 10 −3 N load resulted in a different depth of penetration, with the maximum depth of the indents in the 5 × 10 −3 mol dm −3 doped sample being less than 1 μm, the indentation interaction volume being confined to the PPy film and not influenced by the substrate.…”

Section: Depth-sensing Indentationmentioning

confidence: 99%

“…The size, steric effects, functional groups, charge, and chemical structure of the uploaded drug may affect the polymer nucleation and growth processes and its mechanical properties [13]. The depth-sensing indentation (DSI) technique can be used to determine the mean hardness (H) and reduced modulus (E r ) of PPy films electrodeposited under different circumstances [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The importance of the film structure during self-powered ibuprofen salicylate drug release from polypyrrole electrodeposited on AZ31 Mg

Alshammary

Casillas

Cook

et al. 2016

J Solid State Electrochem

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Therapeutic drugs uploaded into conjugated conductive polymer matrices deposited on active magnesium alloys serve as controlled-dose, self-powered drug-delivery systems. Preferentially, drugs are added into polymer films in the largest amount possible, mostly to prevent long-term treatments. However, added drugs can interact with the polymer matrix affecting either the structure or the final mechanical properties of the polymer film. In this work, polypyrrole films (PPy) electrodeposited on an AZ31 Mg alloy in ibuprofen and salicylate-containing solutions are investigated in terms of their uploading capacity, surface morphology and mechanical properties. The techniques used to investigate the uploaded PPy films include cyclic voltammetry (CV), scanning electron microscopy (SEM), EDS, and depth-sensing indentation (DSI). A maximum ibuprofen concentration of 440 ± 40 μg cm −2 was obtained in PPy films in the presence of sodium salicylate. The release fraction of ibuprofen as a function of time is fitted to Avrami's equation. The hardness and reduced modulus decreased by 54 and 40 %, respectively, when the PPy films are prepared in the presence of sodium ibuprofen compared with those prepared in sodium salicylate only, indicating a more plastic film with ibuprofen.

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Section: Depth-sensing Indentationmentioning

confidence: 60%

Section: Depth-sensing Indentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The importance of the film structure during self-powered ibuprofen salicylate drug release from polypyrrole electrodeposited on AZ31 Mg

Alshammary

Casillas

Cook

et al. 2016

J Solid State Electrochem

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“…25,26 At present, this phenomenon cannot be exhaustively explained, but it is likely due to a combination of factors, e.g., surface nano-roughness, adhesive forces between the tip and the sample, imperfection in tip geometry, formation of an intrinsic harder outer skin in the outermost surface layer of the specimen, etc. 25,27 Till today, there are not many works on the nanomechanical properties of conducting polymers; in the literature, only P3HT has already been studied and the E and H values that have been reported are of 1.4 and 0.08 GPa, respectively. 28 These values are very close to those measured in the case of the P3MTh film, where the average of the Young modulus and of the hardness was about 1.0 and about 0.06 GPa, respectively.…”

Section: Nanomechanical Propertiesmentioning

confidence: 98%

Influence of electrochemical copolymerization conditions of 3‐methylthiophene and biphenyl on the morphology and nanomechanical properties of the films

Triantou

Soulis

Perivoliotis

et al. 2015

J of Applied Polymer Sci

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The aim of this work is to synthesize novel 3-methylthiophene (3MTh)/biphenyl (Biph) copolymer films by electropolymerization and study their mechanical properties through nanoindentation. The morphology, the chemical structure as well as the electrical conductivity of the copolymer films depended strongly on the electropolymerization conditions. It was found that the polymer deposition follow an instantaneous, two-dimensional nucleation and growth mechanism leading to homogenous films. The copolymer films had higher Young modulus and nanohardness than poly(3-methylthiophene) (3PMTh), indicating that the incorporation of Biph units within the P3MTh chain leads to a more densely packed structure and a more brittle polymer. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42575.

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“…The nanoindenter provides a quantitative method for mapping the mechanical properties, most notably hardness ( H ) and reduced elastic modulus ( E r ) on the microscale. Uzun et al …”

Section: Introductionmentioning

confidence: 99%

Study on the preparation and multiproperties of the polypyrrole films doped with different ions

Cheng

Ding

Zhang

et al. 2012

Surface & Interface Analysis

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Conducting polypyrrole (PPy) films doped with p‐toluene solfonate (pTS−), perchlorate (ClO4−) and polyphosphate (PP−) were electrochemically synthesized on the stainless steel SS‐304 and the Indium Tin Oxide (ITO) glass substrates successfully. The conducting polymer composite films were studied by Fourier transform infrared spectra, integrated thermal analysis system and scanning electron microscopy, respectively. Four‐point probe measurements and in situ nanotribolab system equipped with a nanoscale electrical contact resistance package were employed to analyze their electrical and mechanical properties. Results indicate that the film doped with PP− ion showed the best thermal stability. For the ClO4− ion doped films, the glass transition occurred at 274.8 °C. The pTS− ion doped film on the SS‐304 steel had a good conductivity, and there was a voltage barrier that ranged from −1.25 to 1.9 V according to the current–voltage curves. Nanoindentation tests show that the mechanical properties of the PPy/pTS− film and the PPy/PP− film were better than that of PPy/ClO4− films. Copyright © 2012 John Wiley & Sons, Ltd.

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Investigation of mechanical and creep properties of polypyrrole by depth-sensing indentation

Cited by 13 publications

References 26 publications

The importance of the film structure during self-powered ibuprofen salicylate drug release from polypyrrole electrodeposited on AZ31 Mg

The importance of the film structure during self-powered ibuprofen salicylate drug release from polypyrrole electrodeposited on AZ31 Mg

Influence of electrochemical copolymerization conditions of 3‐methylthiophene and biphenyl on the morphology and nanomechanical properties of the films

Study on the preparation and multiproperties of the polypyrrole films doped with different ions

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