The Enzymatic Synthesis of Thiol-Containing Polymers to Prepare Polymer−CdS Nanocomposites

Premachandran, R.S.; Banerjee, Soumitro; John, Vijay T.; McPherson, Gary L.; Akkara, Joseph A.; Kaplan, David L.

doi:10.1021/cm960418p

Cited by 97 publications

(49 citation statements)

References 27 publications

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“…A variety of modified enzymatic polymerization reactions were investigated to improve processability. [17][18][19] Although these modifications improved the molecular weight and processability, the enzymatic reaction typically results in a mixture of branched polymeric structures and limits the degree of conjugation and hence the electrical and optical properties of the resulting polymer.…”

Section: Resultsmentioning

confidence: 99%

A novel method for synthesis of water‐soluble polypyrrole with horseradish peroxidase enzyme

Nabid

Entezami

2004

J of Applied Polymer Sci

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A novel water-soluble, conducting polypyrrole was synthesized by horseradish peroxidase (HRP), in the presence of sulfonated polystyrene, as a polyanionic template. The HRP is an effective catalyst for the oxidative polymerization of pyrrole in the presence of hydrogen peroxide at room temperature. The reaction is sensitive to solution pH and it is performed in pH 2 aqueous solutions. Polymerization of pyrrole by this biological route produced a conducting water-soluble polypyrrole for the first time. The reaction is benign and in one pot, and the product requires minimal purification. The reversible redox activity of the polypyrrole displays a hystersis loop with pH changes. FT-IR, UV-vis absorption spectroscopy ,and cyclic voltammetry are used in the characterization of the synthesized polypyrrole. These studies confirm the electroactive and conducting form of polypyrrole, similar to that which has been traditionally synthesized, chemically and electrochemically.

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Section: Resultsmentioning

confidence: 99%

A novel method for synthesis of water‐soluble polypyrrole with horseradish peroxidase enzyme

Nabid

Entezami

2004

J of Applied Polymer Sci

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“…The polymer chains might have been bridged by their connection to the same nanoparticle, and the multiplicity of such bridged chains and particles could lead to particle clusters. 18 The nanoparticles were clearly dispersed in the CS matrix on a nanoscale, confirming the formation of a nanocomposite. Some spherical particles with the mean diameters of 70 nm could be found (see Fig.…”

Section: Ultraviolet-visible Spectrum Of Znsmentioning

confidence: 77%

Synthesis of MS (M = Zn, Cd, and Pb)–chitosan nanocomposite film via a simulating biomineralization method

Wang¹,

Huang²,

Min-yan³

et al. 2011

Adv Polym Technol

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MS nanoparticles were prepared with chitosan (CS) as the synthesis template at normal temperature by simulating biomineralization method. ZnS , PbS , and CdS CS nanocomposites as model were prepared by simulating biomineralization method of corresponding twain valent ions into nanoparticles in the presence of CS. The structural and morphological features of MS (M = Zn, Cd, and Pb)-CS were investigated by scanning electron microscopy. Optical characteristics of nanocomposites were studied by the approaches of ultraviolet-visible spectroscopy and fluorescence, from which the conclusions show that the CS matrix offers limited conditions for ZnS to grow, the precursor concentration can also affect the formed particle size, and thus the particle size can be controlled in the CS matrix by these two means. The differential scanning calorimetery result indicated a strong and uniform interaction between CS and nanoparticles. The experimental results indicated that all the nanoparticles aggregated into nanopartical and CS as a template played an important role in the formation of nanopartical. In addition, a possible structure-controlling

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“…During polymerization, the polymer precipitates out of the reaction solution, which limits the applicability of this method [11]. Although several strategies have been used to avoid this precipitation, such as modification of monomer structures [12,13], synthesis in micellar media [14], reverse micelles [15,16], and interfacial polymerizations [17], the final conductivity of the obtained PANI is poor in most cases. This poor solubility is said to be due to the presence of different structures in the polymer, giving a highly branched instead of a predominantly head-to-tail linear structure, as is formed in the traditional chemical polymerization of aniline.…”

Section: Peroxidases In Polymer Synthesismentioning

confidence: 99%

Oxireductases in the Enzymatic Synthesis of Water-Soluble Conducting Polymers

Ochoteco

Mecerreyes

2010

Advances in Polymer Science

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This chapter reviews recent advances in the field of biocatalytic synthesis of water-soluble conducting polymers. Biocatalysis is proposed as a versatile tool for synthesis of conducting polymers. First, the enzymatic synthesis of conducting polymers and its mechanism is discussed as well as the use of different type of enzymes. Next, we describe the use of a new bifunctional template (sodium dodecyl diphenyloxide disulfonate) in the synthesis of polyaniline as a strategy to improve the water solubility and electrical conductivity in the obtained polymer. The recent development of enzyme-catalyzed polymerization of 3,4-ethylenedioxythiophene (EDOT) in the presence of polystyrenesulfonate is discussed. This method results in PEDOT materials that show an electrical conductivity of 2 × 10 −3 S cm −1 and posses excellent film formation ability, as confirmed by atomic force microscopy images. Finally, a simple method for immobilizing horseradish peroxidases in the biocatalytic synthesis of water-soluble conducting polymers is presented. This method is based on a biphasic catalytic system in which the enzyme is encapsulated inside the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate, while other components remain in the aqueous phase. The enzyme is easily recovered after reaction and can be reused several times.

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The Enzymatic Synthesis of Thiol-Containing Polymers to Prepare Polymer−CdS Nanocomposites

Cited by 97 publications

References 27 publications

A novel method for synthesis of water‐soluble polypyrrole with horseradish peroxidase enzyme

A novel method for synthesis of water‐soluble polypyrrole with horseradish peroxidase enzyme

Synthesis of MS (M = Zn, Cd, and Pb)–chitosan nanocomposite film via a simulating biomineralization method

Oxireductases in the Enzymatic Synthesis of Water-Soluble Conducting Polymers

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