Synthesis and characterization of high dielectric constant polyaniline/polyurethane blends

Shape memory polymer (SMP) blends based on polyurethane (PU) and polyaniline (PANI) were prepared via chemical in situ polymerization process. The thermal, mechanical, electrical and shape memory properties were investigated. The structural characterization and morphology of the polymer blends were inspected by Fourier transform infrared (FTIR) and scanning electron microscopy (SEM), respectively. The 1 wt% of PANI loading enhanced the thermal stability of the system up to 339 °C. According to differential scanning calorimetry (DSC), the glass transition temperature (T g ) and melting temperature (T m ) of PU/PANI blends increased with the polyaniline loading (0.1 wt%1 wt%). Improved mechanical properties such as tensile strength and Young's modulus of PU matrix were also observed with PANI. Moreover, the electrical conductivity of PU/PANI blends was also found to be a function of PANI loading. Remarkable recoverability of thermally triggered shape memory (SM) behavior to the extent of 96% was achieved for 1 wt% PANI blend.

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“…The SEM image of PANI (Fig. 2a) showed the formation of the spherical structure due to agglomerated particles [25] . From the SEM image in Fig.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

“…From the SEM image in Fig. 2(b), the homogeneous surface for pure PU was observed and characterized as a smooth fracture [25] . Figures 2(c) and 2(d) show the morphology of PU/PANI blend with 0.1 wt% PANI at two different resolutions.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Thermal, mechanical and electrical studies of novel shape memory polyurethane/polyaniline blends

2015

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“…Polyaniline has emerged as one of the most promising conducting organic polymers, owing to its high polymerization yield, good environmental stability, moderate electrical conductivity and relatively low production cost. Recently, we have worked on developing high dielectric permittivity nano-composites systems, such as PANI-DBSA/PU(polyurethane), 29 PANI-DBSA/ PAA, 30 and PANI-DBSA/epoxy, 31 for the applications in the fields of energy storage, integral capacitor technology, electro-active devices and electromagnetic interference(EMI). In these studies, negative ε values have been observed when we follow certain synthetic routes and fabrication procedures.…”

confidence: 99%

Polyaniline nano-composites with large negative dielectric permittivity

et al. 2012

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Two polyaniline (PANI)/polymer nano-composites exhibiting huge negative dielectric permittivity have been synthesized for the first time. These novel chemical processes open a new approach for fabrication of the negative index materials (NIMs), since most of the NIMs prepared today are obtained by a structural approach – by putting together two structured materials that exhibit separately a negative permittivity and a negative permeability. We found the negative permittivity of these nano-composites is a function of the content of the dopant (i.e., PANI) as well as of the frequency. The generation of huge negative permittivity can be rationalized by the well-dispersed PANI-DBSA nano-particles which form a pseudo-continuous conductive pathway in these nano-composites.

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“…However, PAni has low mechanical properties. Among the conventional polymers, polyurethanes (PUs) show good mechanical properties, such as stiffness and flexibility [11][12][13] . Polyurethanes are segmented polymers with microphase separated morphology 14 .…”

Section: Introductionmentioning

confidence: 99%

Castor oil and commercial thermoplastic polyurethane membranes modified with polyaniline: a comparative study

et al. 2013

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The study of conducting polymeric membranes is decisive in some areas, as in fuel cells and electrodialysis. This work aims the study of membranes using conventional and conductive polymers blends. Two types of polyurethane were used as conventional polymers, commercial thermoplastic polyurethane and polyurethane synthesized from castor oil and 4-4-dicyclohexylmethane isocyanate. Two kinds of conducting polymers were used, polyaniline doped with organic acid and a self doped polyaniline. The polymers and the membranes were characterized by electrical conductivity, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM). The synthesis of the membranes produced was proper, featuring a complete reaction, analyzed by FTIR. The membranes also showed good mechanical properties and thermal stability (≈ 220 °C). Among the membranes studied, the polyaniline doped with p-toluenesulphonic acid obtained higher thermal and viscoelastic properties. Thus they can be used in separation techniques using membranes.

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Synthesis and characterization of high dielectric constant polyaniline/polyurethane blends

Cited by 87 publications

References 28 publications

Thermal, mechanical and electrical studies of novel shape memory polyurethane/polyaniline blends

Thermal, mechanical and electrical studies of novel shape memory polyurethane/polyaniline blends

Polyaniline nano-composites with large negative dielectric permittivity

Castor oil and commercial thermoplastic polyurethane membranes modified with polyaniline: a comparative study

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