Crystalline Structure and Thermal Behavior of Water-Soluble Copolymers with Pendant Terthiophenes

Chen, Li; Kaneko, Tatsuo; Gong, Jian Ping; Osada, Yoshihito; Ohsedo, Yutaka; Shirota, Yasuhiko

doi:10.1002/1521-3935(20020101)203:1<176::aid-macp176>3.0.co;2-4

Cited by 3 publications

(5 citation statements)

References 12 publications

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“…Likewise, a new absorption band at λ max = 460 nm for the dedoped copolymer is ascribed to the neutral sexithiophene chromophore. These results are similar to those for PV3T and PMA3T,10,11 and coincide with the doping behavior at high temperature for linear poly(AA3T‐ co ‐AA)s 9. In the case of copolymers with F = 0.05, 0.21, and 1.0, these two new absorption bands at λ max = 550 and 460 nm also appeared by electrochemical doping and dedoping.…”

Section: Resultssupporting

confidence: 86%

“…Poly(AA3T‐ co ‐AA) linear copolymers with various AA3T compositions were prepared by radical copolymerization of AA3T and AA according to the method previously reported 9. Poly(AA3T‐ co ‐AA) gels were prepared by the same method as the linear copolymer in the presence of MBAA in DMSO.…”

Section: Experimental Partmentioning

confidence: 99%

“…In a previous paper, we synthesized the poly(AA3T‐ co ‐AA) water‐soluble copolymers with pendant terthiophenes by the radical copolymerization of [(2,2′:5′,2″‐terthiophen‐5‐yl‐)methyl acrylate] (AA3T) and acrylic acid (AA), and studied their molecular structures and thermal behaviors 9. It was found that the copolymers containing a certain amount of AA3T can form crystals with monolayer structure, while the incorporation of too many AA units into the copolymers disrupted this structure.…”

Section: Introductionmentioning

confidence: 99%

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Water‐Swollen Hydrogels with Pendant Terthiophenes

Chen

Gong

Ohsedo

et al. 2003

Macro Chemistry & Physics

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A chemically cross‐linked and water‐swollen poly(AA3T‐co‐AA) gel having pendant terthiophenes was synthesized by radical copolymerization of [(2,2′:5′,2″‐terthiophen‐5‐yl‐)methyl acrylate] (AA3T) and acrylic acid (AA), and its swelling, dissociation, and doping behaviors were studied. The gel swells in high pH solution, which is associated with the dissociation and, hence, electrostatic repulsion of the AA units, and the pH value at which the swelling starts increases with increasing AA3T composition. The dissociation of the gels is suppressed, presumably due to the incorporation of the hydrophobic AA3T unit, and, once started, the dissociation could be promoted by AA3T in the low pH region. Poly(AA3T‐co‐AA) copolymers and gels can be easily electrochemically and chemically doped. The volume change of the gels is observed during doping/undoping and the maximum volume change reached was about 50%.

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Section: Resultssupporting

confidence: 86%

Section: Experimental Partmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Water‐Swollen Hydrogels with Pendant Terthiophenes

Chen

Gong

Ohsedo

et al. 2003

Macro Chemistry & Physics

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“…In recent years, new types of electron‐conducting polymers, nonconjugated, vinyl‐type polymers with pendant π ‐electron systems have attracted a great deal of attention due to their chemical stability, processability, photoconducting properties, and electrochemical behavior 3–6. We have systematically studied nonconjugated vinyl‐type polymers containing pendant oligothiophenes with designated molecular size and showed that the insulating polymers are transformed into electron‐conducting polymers by electrochemical and chemical doping 7–9…”

Section: Introductionmentioning

confidence: 99%

When Mesoporous Silica Meets the Alkaline Polyelectrolyte: A Controllable Synthesis of Functional and Hollow Nanostructures with a Porous Shell

Liang

Wang

2012

Chemistry A European J

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An efficient and environment friendly surface-protected etching method by using mesoporous silica as a template and alkaline polyelectrolyte as both the protecting and etching agent was developed to prepare a SiO(2) nanotube with a porous shell. The polyelectrolytes attached to the template not only create a localized alkaline environment, but also effectively protect the silica surface, whereas the mesopore channels accelerate the diffusion of etchant throughout the template, all of which facilitate the formation of hollow structures in a fully controllable way. By tuning the etching power and protecting ability of the polyelectrolyte, the rigidity and porosity of products can be precisely manipulated. It is inspiring that various alkaline polyelectrolytes including polypeptide and dextran derivative can be used for the etching process, so that the porous and hollow nanostructures are born with positively charged and biocompatible surface as well as abundant amino groups for further coupling, which make them potential capsules for drug delivery and probes for imaging and detection. The protective etching process can also be extended to the preparation of yolk-shell super structures with functional cores, or porous nanoparticle assemblies with their individual characteristics maintained.

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“…[3][4][5][6] We have systematically studied nonconjugated vinyl-type polymers containing pendant oligothiophenes with designated molecular size and showed that the insulating polymers are transformed into electron-conducting polymers by electrochemical and chemical doping. [7][8][9] More recently, p-conjugated polymers with pendant sulfonic groups were developed as self-doped, conducting polymers, since they have found practical application. [10][11][12][13][14] In this paper, we describe the synthesis of water-swollen Full Paper: The water-swollen poly(AA3T-co-NaSS) and poly(AA3T-co-PEG) gels were synthesized by radical copolymerization of the monomer, [(2,2 0 :5 0 ,2 00 -terthiophen-5-yl)methyl acrylate] (AA3T), containing pendant terthiophenes as an electron-conducting material with a soluble monomer, sodium p-styrenesulfonate (NaSS), or oligo(ethylene glycol) (PEG); their swelling, spectral, and doping behaviors were investigated.…”

Section: Introductionmentioning

confidence: 97%

Study on Doping Behaviors of Vinyl Hydrogels with Pendant Terthiophenes

Chen

Gong

Ohsedo

et al. 2003

Macro Chemistry & Physics

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The water‐swollen poly(AA3T‐co‐NaSS) and poly(AA3T‐co‐PEG) gels were synthesized by radical copolymerization of the monomer, [(2,2′:5′,2″‐terthiophen‐5‐yl)methyl acrylate] (AA3T), containing pendant terthiophenes as an electron‐conducting material with a soluble monomer, sodium p‐styrenesulfonate (NaSS), or oligo(ethylene glycol) (PEG); their swelling, spectral, and doping behaviors were investigated. The degree of swelling of the poly(AA3T‐co‐PEG) gel was independent of the pH, whereas that of poly(AA3T‐co‐NaSS) gel increases abruptly below pH 3, which suggests self‐doping between the AA3T and NaSS groups. The self‐doping is not suppressed by cross‐linking. Both poly(AA3T‐co‐NaSS) and poly(AA3T‐co‐PEG) gels can be chemically doped with concentrated HCl or HClO4 solution.Concentration dependence of the absorbency of the copolymers and gel.magnified imageConcentration dependence of the absorbency of the copolymers and gel.

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Crystalline Structure and Thermal Behavior of Water-Soluble Copolymers with Pendant Terthiophenes

Cited by 3 publications

References 12 publications

Water‐Swollen Hydrogels with Pendant Terthiophenes

Water‐Swollen Hydrogels with Pendant Terthiophenes

When Mesoporous Silica Meets the Alkaline Polyelectrolyte: A Controllable Synthesis of Functional and Hollow Nanostructures with a Porous Shell

Study on Doping Behaviors of Vinyl Hydrogels with Pendant Terthiophenes

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