Molecular iodine/polymer complexes

Moulay, Saâd

doi:10.1515/polyeng-2012-0122

Cited by 162 publications

(150 citation statements)

References 330 publications

(396 reference statements)

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“…24−29 Iodine is known to form charge transfer complexes (CTCs) with electron-rich molecules such as those with lone pairs and aromatic rings in the form of polyiodides. 29,30 Bromine is another halogen that has been studied for enhancement of the carbonization process and has been compared with iodine. 26,31 It was found that bromination is nonselective and localized, while iodination was selective to aromatics and nonlocalized, iodinating throughout the material.…”

Section: ■ Introductionmentioning

confidence: 99%

Iodine Treatment of Lignin–Cellulose Acetate Electrospun Fibers: Enhancement of Green Fiber Carbonization

Schreiber

Vivekanandhan

Mohanty

et al. 2014

ACS Sustainable Chem. Eng.

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Pure biopolymer-based electrospun precursor carbon fibers are fabricated using an abundant and inexpensive biopolymer lignin blended with renewable resource-based cellulose acetate (CA). Iodine treatment on the fabricated green fiber was successfully performed in order to enhance the carbonization process as well as the retention of fiber morphology. The absorption mechanism of iodine by lignin and cellulose acetate and their derived electrospun green fibers has been investigated by means of thermal behavior and morphological retention. It was found that iodine treatment plays a vital role in altering the graphitization behavior as well as morphology retention during the carbonization process. With the help of iodine treatment, the green precursor fibers were successfully converted into thin carbon fibers, and scanning electron microscopy analysis confirmed the retention of fibrous structures with diameters around 250 nm. Raman spectroscopy revealed that although the overall level of graphitization was lower compared to polyacrylonitrile-based fibers, the graphitic crystallite size was larger in the produced carbon fibers. The produced pure biopolymer fibers and iodine treatments show promise for the production of green and costreduced carbon fibers.

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Section: ■ Introductionmentioning

confidence: 99%

Iodine Treatment of Lignin–Cellulose Acetate Electrospun Fibers: Enhancement of Green Fiber Carbonization

Schreiber

Vivekanandhan

Mohanty

et al. 2014

ACS Sustainable Chem. Eng.

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“…Instead, molecular iodine has been mostly and intensively employed as dopant for polymers, generating iodine-polymers' complexes. [14] Recently, a fascinating finding lies on the reaction of submicron-sized polymer particles (PSE) containing imidazoline selenones with halogens to form adducts with vivid color change from white to red-orange (red-orange with I 2 , yellow with Br 2 , and yellow with faint red color with Cl 2 ). [15] In this review paper, an account of uses of molecular iodine in polymer synthesis is outlined.…”

Section: Introductionmentioning

confidence: 99%

Molecular iodine in monomer and polymer designing

Moulay

2013

Designed Monomers and Polymers

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Not only does the molecular iodine play a leading role in organic synthesis but also in the polymer synthesis. Different kinds of polymerization initiated by molecular iodine are herein screened: cationic polymerization, radical polymerization, living/controlled radical polymerization (LCRP) such as reverse iodine transfer polymerization, polycondensation, and ring-opening polymerization (ROP). Also, the functionalization of polymers using molecular iodine, such as the acetylation of polysaccharides (cellulose, starch), and the use of iodine-polymer complex in organic synthesis are also discussed. Numerous natural and synthetic polymers are prone to make complexes with molecular iodine, and one feature of such complexes is their propensity as polymer-supported reagent and catalysts in many organic syntheses.

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“…The binding energy at 620.65 and 632.15 eV is associated with CI bond in the I 3d spectrum (Figure C), and other valence states of iodine, such as I − (3d 5/2 , 618 eV), IO 3− (3d 5/2 , 623 eV), and I 2 (3d 5/2 , 619.9 eV) were not detected in the XPS spectrum . Moreover, the binding energy at 285.4 eV in the C 1s spectrum further confirmed the formation of CI bond (Figure D), and the starch‐I 2 colorimetric reaction and AgNO 3 ‐I − precipitation reaction revealed the absence of I − or I 2 in the as‐prepared I‐PPy nanoparticles (Figure S1A, Supporting Information). These results demonstrated that iodine was covalently bound to the C atom in the form of CI bond in I‐PPy nanoparticles.…”

Section: Resultsmentioning

confidence: 71%

One‐Step Synthesis of Iodinated Polypyrrole Nanoparticles for CT Imaging Guided Photothermal Therapy of Tumors

Zou

Huang

Zhang

2018

Small

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Theranostic materials are of great significance to a personalized precise medicine. However, conventional theranostic agents are mainly fabricated by combining presynthesized independent imaging probes and therapeutic agents, suffering from multiple synthesis procedures, poor morphological control, and time/reagent‐consuming process. Herein, iodinated polypyrrole (I‐PPy) nanoparticles are fabricated via a one‐step synthesis strategy combining chemical oxidation and iodination for computed tomography (CT) imaging‐guided photothermal therapy. Iodic acid with a high standard electrode potential enables the chemical oxidation polymerization of pyrrole monomers. Meanwhile, the iodination of PPy induced by the corresponding reduction product I2 takes place during the polymerization process to generate I‐PPy nanoparticles. The prepared I‐PPy nanoparticles possess a uniform size, excellent colloidal stability, intense near‐infrared absorption, strong X‐ray attenuation ability, and favorable biocompatibility. The as‐synthesized I‐PPy nanoparticles not only guarantee remarkable contrast‐enhanced CT imaging of blood pool and tumors, but also realize effective tumor suppression in vitro and in vivo by I‐PPy nanoparticles‐mediated CT imaging‐guided photothermal therapy. To the best of the authors' knowledge, it is the first time that multifunctional PPy nanoparticles are fabricated through a one‐step synthesis process. The proposed strategy opens up a new way for the fabrication of high‐performance theranostic agents via a one‐step strategy under mild conditions.

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Molecular iodine/polymer complexes

Cited by 162 publications

References 330 publications

Iodine Treatment of Lignin–Cellulose Acetate Electrospun Fibers: Enhancement of Green Fiber Carbonization

Iodine Treatment of Lignin–Cellulose Acetate Electrospun Fibers: Enhancement of Green Fiber Carbonization

Molecular iodine in monomer and polymer designing

One‐Step Synthesis of Iodinated Polypyrrole Nanoparticles for CT Imaging Guided Photothermal Therapy of Tumors

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