A novel thermosensitive soluble polypyrrole composite

Han, Jae Sun; Lee, Jun Young; Lee, Sang Soo

doi:10.1016/s0379-6779(01)00366-6

Cited by 11 publications

(2 citation statements)

References 15 publications

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“…However, the combination of this electrically conducting polymer with environmentally responsive polymers such as chitosan results in a composite that combines a mechanical response under pH changes , and electrical stimuli . PNIPAM derivatives have also been combined with electrically conductive polymers, such as polypyrrole, to achieve a composite with thermosensitive swelling behavior in water . The aim of this work was to synthesize polyaniline colloidal particles by enzymatic polymerization using environmentally sensitive polymers as steric stabilizers.…”

Section: Introductionmentioning

confidence: 99%

pH- and Thermosensitive Polyaniline Colloidal Particles Prepared by Enzymatic Polymerization

et al. 2006

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Polyaniline colloids were prepared by enzymatic polymerization using chitosan and poly(N-isopropylacrylamide) as steric stabilizers. The resulting nanoparticles undergo flocculation by changing the pH or temperature of the aqueous dispersions. The environmentally responsive behavior of these colloids contrasts with that of polyaniline colloids synthesized using poly(vinyl alcohol) as the steric stabilizer. The colloid size was a function of the steric stabilizers and ranged from approximately 50 nm for polyaniline particles prepared in the presence of chitosan and partially hydrolyzed poly(vinyl alcohol) up to 350 nm for the particles synthesized using poly(N-isopropylacrylamide). UV-visible and Fourier transform infrared spectroscopic studies indicate that polyaniline colloids are spectroscopically similar to those obtained by traditional dispersion polymerization of aniline by chemical oxidation. These polyaniline colloids have potential applications in thermochromic windows and smart fluids.

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Section: Introductionmentioning

confidence: 99%

pH- and Thermosensitive Polyaniline Colloidal Particles Prepared by Enzymatic Polymerization

et al. 2006

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“…One possible solution to overcome these issues can be preparation of semi‐conductive polymer‐based composites. These semi‐conducting composites help PPy to have better performance in mechanical strength, solubility, processability, etc 19‐21 . Among different kind of composite particles, Janus structures have attracted a considerable attention because of their special structures and applications in the preparation of smart materials 22,23 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of core‐shell and Janus polystyrene@polypyrrole particles by variation of surfactant and monomer amount through seeded emulsion polymerization

Dehghani

Amani

Salami‐Kalajahi

2020

Polymers for Advanced Techs

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Polystyrene (PS) seed particles were synthesized under similar conditions with different anionic, cationic, and non-ionic surfactants, as well as without surfactant. The effect of surfactant type on the morphology and size of PS particles was investigated. These particles were then used as seeds in chemical oxidative polymerization of pyrrole and the effect of surfactant type and pyrrole/seed weight ratio on the morphology of the resulting composite particles was monitored. According to the results, different surface properties of PS seed particles resulted in various morphologies. Anionic surfactant led to formation of core-shell structure because of electrostatic interactions between polypyrrole (PPy) oligomers and seed particles. However, cationic surfactant led to electrostatic repulsions between positively-charged PPy oligomers and PS particles' surface and formation of patchy structures. Non-ionic surfactant resulted in formation of snowman-like Janus particles due to absence of electrostatic interactions. K E Y W O R D S conductive polymers, core-shell particles, Janus particles, polypyrrole 1 | INTRODUCTION π-conjugated polymers which are usually known as semi-conductive polymers, can be electrically conductive due to localization of the π-electrons which means there is no limitation on the movement of electrons in π-conjugated polymers. In summary, a polymer is capable to transport charge when an electron is added or subtracted and it is well known that, it might happen by using oxidation and reduction processes which is generally called "doping". 1,2 It is notable to say that the doping degree and the synthesis method have a great effect on the polymer properties. 3,4 Applications of these materials include field effect transistors, 5 organic light emitting diodes (OLEDs), 6 photovoltaic devices, 7 sensors, 5 solar cells, 8 etc. Semi-conductive polypyrrole (PPy) has attracted considerable attention due to its excellent electrical, electrochemical, and optical properties, environmental stability, etc. 9 These unique characteristics have provided great applicability in lightweighted batteries, 10 electrochemical sensors, 11 optical devices, 12 membrane separation, 13,14 etc. PPy have also found applicability in biomedical fields. 15,16 It has been utilized to produce an electrical stimulus for cell growth in tissue engineering and also regeneration of neuron cells. 17 However, the poor affinity between PPy and cells due to the hydrophobicity of PPy has limited these applications. Despite semi-conductive polymers' excellent electrical performance, π-conjugated chains lead them to have poor solubility, low mechanical properties, and poor processability which hinder their applications in technology. 18 One possible solution to overcome these issues can be preparation of semi-conductive polymer-based composites. These semi-conducting composites help PPy to have better performance in mechanical strength, solubility, processability, etc. 19-21 Among different kind of composite particles, Janus structures have a...

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Preparation and characterization of nylon‐6/PPy/MMT composite of nanocomposite

Peighambardoust

Pourabbas

2007

J of Applied Polymer Sci

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Series of composites consisting of polypyrrole/montmorillonite nanocomposites in the matrix of Nylon6 has been synthesized and characterized in this work. The composites were processable, so that test samples were prepared by compression-molding of the materials for electrical property measurements. Intercalated structures were confirmed by wide-angle X-ray diffraction and TEM studies for PPy/MMT nanocomposites. A two-phase structure was determined for the fused samples consisting of two separated N6 and PPy phases by using scanning electron microscopy analyses. A conductivity threshold was measured at 15%(w/w) loading level of PPy in the composites. Electrical resistivity-temperature behavior of the samples was investigated and a resistivity peak was observed at 1008C for the samples. It was proved that the glass transition temperature of PPy around 1008C should be the responsible factor for the observed resistivity peak, as studied by thermogravimetic analysis and differential scanning calorimetry thermal methods.

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A novel thermosensitive soluble polypyrrole composite

Cited by 11 publications

References 15 publications

pH- and Thermosensitive Polyaniline Colloidal Particles Prepared by Enzymatic Polymerization

pH- and Thermosensitive Polyaniline Colloidal Particles Prepared by Enzymatic Polymerization

Synthesis of core‐shell and Janus polystyrene@polypyrrole particles by variation of surfactant and monomer amount through seeded emulsion polymerization

Preparation and characterization of nylon‐6/PPy/MMT composite of nanocomposite

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