Polyphenylene vinylene poly

Another approach to CPL is the synthesis of conjugated polymers with intrinsic chiro-optical properties. A variety of polymers with CPPL have been synthesized so far. Most of them are based upon well-known conjugated polymers such as poly(thiophene)s [4,111], polyphenylene vinylene)s [123], poly(thienylene vinylene)s [124], ladder polymers [125], PPPs [126], polyphenylene ethynylene)s, [127] and poly(fluorenes) [128]. All of them have been modified with chiral side-chains, which induce the chiro-optical properties. [Pg.472]

Fig. 1 Building units of conducting polymers, (1) polyacetylene (PA) (2) polypyrrole (PPy), polythiophene (PTh), polyfurane (PFu) (3) polyphenylene (PP) (4) polyaniline (PANI) 5 polyindole (PIND) (6) polycarbazole (PCaz) (7) polyazulene (Paz) (8) polynaphthalene (PNa) (9) polyanthracene (PAnth) (10) polypyrene (PPyr) (11) polyfluorene (PFiu) (12) poly(isothionaphthalene) (PITN) (13) poly(dithienothiophene) (14) poly(thienopyrrole) (15) poly(dithienylbenzene) (1G) poly(3-alkylthiophene) (17) poly(phenylene vinylene) (18) poly(bipyrrole) (PBPy), poly(bithiophene) (PBT) (19) poly(phenylenesulfide) (20) 4-poly(thienothiophene) (21) poly(thienyl vinylene), poly(furane vinylene) (22) poly(ethylenedioxythiophene) (PEDOT).

The following aspects will be addressed. (1) Conjugated polymers with benzene-derived repeat units (section II) typical examples are the already mentioned poly-/>phenylene (PPP) 6,43 polyphenylene-vinylenes (PPV) 9,43 and polyphenyleneethinylenes (PPE) 25.44 Some typical questions are obvious how do the aromatic or olefinic units interact via the formal single bonds and how far does an extra charge or an excitation delocalize over the chain. (2) Large... [Pg.4]

The structural analysis using high resolution solid-state NMR has been successfully performed on other conducting polymers such as polyphenylene vinylene [21], polyaniline [22-24], polyphenylene sulphide [25, 26] and poly-p-phenylene [27-29]. [Pg.610]

Despite significant efforts, the types of conducting polymers are limited to PHT, PPy, PA, PANI, PEDOT, polyphenylenes (PP), poly(p-phenylene vinylene) (PPV), and a few others. Here, some significant results on PANI, PPy, and PEDOT conducting polymers and their nanostructures are briefly reviewed as follows. [Pg.497]

Structural studies of polymer surfaces. Materials that have been studied include PMMA [239], PMMA-polypyrrole composites [240], polyfchloromethyl styrene) honnd 1,4,8,11-tetrazacyclotetradecane, polyfchloromethyl styrene) honnd thenoyl triflnoroacetone [241], poly(dimethyl siloxane)-polyamide copolymers [242], PS [243], ion-implanted PE [244], monoazido-terminated polyethylene oxide [245], polynrethanes [246], polyaniline [247], flnorinated polymer films [248], poly(o-tolnidine) [249], polyetherimide and poly benzimidazole [250], polyfnllerene palladinm [251], imidazole-containing imidazolylethyl maleamic acid-octadecyl vinyl ether copolymer [252], polyphenylene vinylene ether [253], thiophene oligomers [254], flnorinated styrene-isoprene derivative of a methyl methacrylate-hydroxyethyl methacrylate copolymer [255], polythiophene [256], dibromoalkane-hexaflnorisopropylidene diphenol and bisphenol A [257], and geopolymers [258]. [Pg.131]

FIGURE 10.2 (a) Polyaniline in oxidized state (y= 1 leucoemeraldine y=0.5 emer-aldine y = 0 pemigraniline) (b) polypyrrole (c) polyphenylene vinylene (d) polythi-enopyrrole (e) poly(paraphenylene) (f) polythiophene (g) polyphenylene sulfide (h) polyfuran (i) poly(diphenylamine) (j) polypyridine (k) polyfluorene (1) poly(phenylene vinylene) (m) polyacetylene (n) poly(thienylene vinylene) (o) poly(furylene vinylene) and (p) poly(3,4-ethylenedioxythiophene). [Pg.242]

Substituted polyphenylene vinylenes can be obtained by the Heck reaction (Table I). Table I. Pd-catalyzed synthesis of poly(phenylene vinylene)s... [Pg.62]

Polyacetylene Polyphenylene Polythiophene Poly(phenylene vinylene)... [Pg.344]

Poly(p-phenylene vinylene) Polythiophene Polyphenylene sulfide Poly anilines... [Pg.2]

An extensive review of the synthesis of rc-conjugated polymers is presented using a tutorial approach to provide an introduction to the field intended for the undergraduate student and the experienced chemist alike. The many synthetic methodologies that have been used for the synthesis of conjugated polymers are outlined for each class of polymers with a focus on research from the 1990s. The effect of structure on electrical properties is detailed. Specific systems reviewed include the polyacetylenes, polyanilines, polypyrroles, polythiophenes, poly(arylene vinylenes), and polyphenylenes. [Pg.57]

Keywords Conducting polymers, Conjugated polymers, Polyacetylenes, Polyanilines, Polypyrroles, Polythiophenes, Poly(arylene vinylenes), Polyphenylenes... [Pg.57]

Interest in the preparation of conducting polyphenylenes led to the development of poly(4,7-benzofuran vinylene) (270). It was prepared from 4,7-dimethylbenzofuran (271) and was found to have a band gap of 2.76 eV. The corresponding thiophene polymer had a shghtly larger band gap of 2.92 eV <94JPS(A)65>. [Pg.422]

Polyquinolines and polyquinoxalines are n-type (electron transporting) polymers and therefore offer alternative EL device engineering in conjunction with the extensively studied p-type (hole transporting) polymers such as poly(p-phe-nylene vinylene)s, polyphenylenes, and polythiophenes. A variety of polyquinolines [331,332] and polyquinoxalines [333] has been reported in the literature, acting as the active... [Pg.778]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...