Thermal behavior of polyaniline films and polyaniline–polystyrene blends

Jousseaume, V.; Morsli, M.; Bonnet, A.

doi:10.1002/app.10468

Cited by 16 publications

(6 citation statements)

References 28 publications

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“…9(a) and compare with Fig. 8] as temperature increases until ∼483 K. This temperature signals polymer degradation; in agreement with thermogravimetric analysis in Figure 1, the onset of degradation is about 493 K. Nonreversible degradation at high temperatures ( T > 483 K) is common to many polymers and polymer blends 47, 48…”

Section: Discussionsupporting

confidence: 83%

Relaxations in chitin: Evidence for a glass transition

González-Campos¹,

Prokhorov²,

Luna‐Bárcenas³

et al. 2009

J Polym Sci B Polym Phys

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Relaxations in chitin have been investigated in the temperature range 298–523 K using impedance spectroscopy in the frequency range 10−1–108 Hz. The objective was to detect a glass‐transition temperature for this naturally occurring, semicrystalline polysaccharide. The impedance study was complemented with X‐ray diffraction, thermogravimetric, and differential scanning calorimetry measurements. Preliminary impedance data treatment includes the subtraction of the dc conductivity contribution, the exclusion of contact and interfacial polarization effects, and obtaining a condition of minimum moisture content for further analysis. When all these aspects are taken into account, two relaxations are clearly revealed in the impedance data. For the first time, evidence is presented for a relaxation process, which exhibits a non‐Arrhenius temperature dependence, in dry α‐chitin (∼0.1% moisture content), and likely represents the primary α‐relaxation. This evidence suggests a glass transition temperature for chitin of 335 ± 10 K estimated on the basis of the temperature dependence of the conductivity and of the relaxation time. A second relaxation in dry α‐chitin, not previously reported in the literature, is observed from 353 K to the onset of thermal degradation (∼483 K) and is identified as the σ‐relaxation often associated with proton mobility. It exhibits a normal Arrhenius‐type temperature dependence with activation energy of 113 ± 3 kJ/mol. The latter has not been previously reported in the literature. A high frequency secondary β‐relaxation is also observed with Arrhenius activation energy of 45 ± 1 kJ/mol. © 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 932–943, 2009

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Section: Discussionsupporting

confidence: 83%

Relaxations in chitin: Evidence for a glass transition

González-Campos¹,

Prokhorov²,

Luna‐Bárcenas³

et al. 2009

J Polym Sci B Polym Phys

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“…The disadvantage of CP is that it does not have good mechanical properties. Several attempts were made to combine the mechanical properties of insulating polymers with CP, involving composites and blends, such as PANI mixed with epoxy resin, to produce materials with anti-corrosion properties [12] ; blends of PANI and lignin to study modification in the thermal properties of CP [13] and PANI with polystyrene (PS) to investigate electrical and thermal properties [14] . The mixing of CP with insulating polymers presents the advantage of producing materials with good mechanical properties associated with attractive electrical properties [15] .…”

Section: Introductionmentioning

confidence: 99%

Studies of optical, morphological and electrical properties of POMA/PMMA blends, using two different levels of doping with CSA

2012

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Poly(o-methoxyaniline) (POMA) was synthesized by oxidative polymerization of the monomer o-methoxyaniline. POMA/ poly(methyl methacrylate) (PMMA) blends were produced by dissolving both polymers in chloroform (CHCl 3 ).The amount of camphor sulfonic acid (CSA) used as dopant of POMA was different, providing two methods for preparation of the blends. Solutions were analyzed by Fourier transform infrared spectroscopy (FTIR) and then deposited on glass substrate by spin coating for characterization by atomic force microscope (AFM) and current versus voltage (I × V) curves. FTIR spectra of solutions were similar as expected. In the AFM images a reduction and/or loss of globules common in conducting polymers (CP) such as polyaniline (PANI) and its derivatives was observed. Films produced with different amounts of CSA presented distinct, linear and non-linear I × V curves.

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“…Great attention has been given to the investigation of these systems, aiming to develop new materials, because polymer blends are an economical means to develop new resins at low cost 7. The advantage of mixing CP with insulating polymers is to produce materials with good mechanical properties associated with properties of interest8 such as absorption, electrical, and photoluminescence (PL). When two amorphous polymers are mixed, it is possible to produce a homogeneous mixture at the molecular level or a mixture with phase separation, i.e., heterogeneous 4.…”

Section: Introductionmentioning

confidence: 99%

POMA/PMMA blends modified by dye: Spectroscopic and morphological properties

Pereira

Monte

Ceschin

et al. 2012

J of Applied Polymer Sci

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Poly(o-methoxyaniline) (POMA), a conductive polymer (CP) well known, was used to prepare blends with poly(methyl methacrylate) (PMMA). Conducting polymer keeps absorbance strength within the PMMA matrix. POMA/PMMA blends presented absorption bands regarding the conducting polymer with different intensities and the main band red shifting. However, POMA/ PMMA blends showed no photoluminescence (PL) emission. After the hybridization process of the CP with a photoluminescent dye, 2,1,3-benzothiadiazole, POMA/PMMA blends showed new optical properties. PL spectra revealed an emission in the range of 500-550 nm, indicating interaction between the dye and the conducting polymer. The presence of the dye modified the morphological properties of the POMA/PMMA blends. New features have appeared on the surface of the blends prepared with higher concentration of hybridized CP. Blends with lower concentrations of hybridized CP showed their surfaces with POMA globules being covered by PMMA. This morphology replaced the globules and ''crystals'' on the surface of the blends prepared without the dye.

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Thermal behavior of polyaniline films and polyaniline–polystyrene blends

Cited by 16 publications

References 28 publications

Relaxations in chitin: Evidence for a glass transition

Relaxations in chitin: Evidence for a glass transition

Studies of optical, morphological and electrical properties of POMA/PMMA blends, using two different levels of doping with CSA

POMA/PMMA blends modified by dye: Spectroscopic and morphological properties

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