Poly-carbonate dichloro

Kim et al. showed that poly(phenylene vinylene) tubes could be prepared starting from ot,ot -dichloro-p-3q lene. In a quartz tube, the monomer vras vaporized, pyrolysed, and subsequently deposited as a precursor polymer inside the pores of a poly(carbonate) or alumina membrane. Thermal treatment (270 °C) yielded poly(phenylene vinylene) tubes inside the porous substrates. ... 

HydTOX5 proline-derived polyesters are usually readily soluble in a variety of organic solvents (benzene, toluene, chloroform, dichloro-methane, carbon tetrachloride, tetrahydrofuran, dimethylformamide, etc.) As expected, the solubility in hydrophobic solvents increased with increasing chain length of the N protecting group, while the solubility in polar solvents decreased. For example, poly(N-hexanoyl-hydroxyproline ester) is slightly soluble in ether but easily soluble in acetonitrile, while poly(N-palmitoylhydroxyproline ester) is readily soluble in ether but virtually insoluble in acetonitrile. 

As previously reported ( ) linear poly(2,6-dichloro-l,4-phenyle-neoxide) exhibits the expected sharp singlet in its H-nmr spectrum, together with some minor peaks due to chemical asperities in the polymer. The spectrum of this polymer (Figure 3) is also very simple, consisting of the expected four sharp lines of the four inequivalent carbons in the mer unit 1. These same four lines may be identified Civ... 

The 1H NMR spectra of the polymers were obtained with a Varian HR-300 spectrometer, at 110-120° C, using 5-10% solutions of polymer in hexachloro-butadiene. The effect of temperature and solvent on the H NMR spectrum of a cationically prepared poly(4-methyl-l-pentene) was investigated. Figure 1-3 show the results obtained with carbon disulfide, carbon tetrachloride, o-dichloro-benzene, p-dichlorobenzene, and hexachlorobutadiene. 

High molecular weight poly(ester-carbonate)s were prepared via the dichloro-formate synthesis as illustrated in Scheme 10 [3]. 

Farwell and coworkers [209,210] investigated the electrochemistry of mono- and poly-chlorobiphenyls at mercury in DMSO containing TEABr. These compounds exhibit sequential two-electron removal of chlorine, but there is a tendency (due to the varied pattern of chlorine substitution) for more than one product to be formed sometimes two chlorines are expelled simultaneously. In another study, Maruyama and Murakami [211] reported that chlorinated biphenyls are reduced in DMF via one-electron cleavage of a carbon-chlorine bond to yield chloride and an aryl radical, which subsequently abstracts a hydrogen atom from the solvent. Rusling and Arena [212] probed the reduction of 4-bromo-, 4,4 -dibromo-, 3,4-dichloro-, and 2,2, 5,5 -tetrachlorobiphenyl at mercury in... 

Figure 4.4 Example of bead formation during electrospinning SEM micrographs of poly (propyl carbonate) (PPC) beads prepared by electrospinning a PPC solution in dichloro-methane. (Reprinted with permission from Biomaterials, Electrospun aliphatic polycarbonates as tailores tissue scaffold materials by A. Welle, M. Kroger et al., 28, 2211-2219. Copyright...

Ballarin et al. used sonogel-carbon composite electrodes containing CoPc for the oxidation of cysteine The catalytic process is mediated by the generation of the Co Pc species. Oxidation of sulfide ion was catalyzed by microcrystals of CoPc immobilized at a surface of paraffin impregnated graphite electrode. Filanovsky reported the use of a carbon electrode prepared by hand pressing carbon powder mixed with CoPc and a polymer solution (poly(methyl methacrylate)) in dichloromethane, followed by evaporating the dichloro-methane, for the analysis of mercaptoethanol in petroleum and cysteine in human urine with detection limits of 8 x 10 M for the former and 2 x 10 M for the latter . 

The same reaction can also be carried out on a copolymer of ethylene and carbon monoxide [266], Polycaprolactam can be treated with either SO2CI2, POCI3, or PCI5 at 70°C to introduce ionic chlorine groups [267]. The main product is poly(a,a-dichloro-caprolactam) ... 

The formation of chloroformates and chlorosulphates via insertion of carbon monoxide and sulphur dioxide, respectively, into the O—Cl bonds of per- or poly-fluoroalkyl hypochlorites (sec Vol. 1, p. 150) has formed the subject of some new patent literature. Perfluoroalkyl hypochlorites have also been used to prepare perfluoro-[(iV-chloro)methylethylamine [CjFj NiCFt-f CFa-OCl (CF3)(C F,)NC1 + COF2] (see p. 212), AW-dichloro(chloro-... 

Poly substituted aryl isocyanates 236 and 238 were obtained with diphosgene in dioxane, ethyl acetate, or toluene from 3-fluoro-4-methoxyaniline 235 [164] and 3-amino-2,6-dichloro-4-fluorophenyl methyl carbonate 237 [165], respectively. Table 4.8 summarizes the reported substituted aryl isocyanate preparations with diphosgene. 

Poly(p-phenylenevinylene) (PPV) could be obtained in the form of nanotubes, nanorods and nanofilms by the chemical vapor deposition (CVD) polymerization of a,a -dichloro-/7-xylene followed by thermal dehydrochlorination. The polymerizations were conducted on the inner surface of or inside the nanopores of alumina or polycarbonate membrane filters or on the surface of silicon wafers. The PPVs thus obtained could be thermally converted to the corresponding carbonized tubes, rods, and films. We also could obtain nanopatterns and nanowells of PPV and carbon on silicon wafers by utilizing nanolithographed poly(methyl methacrylate) patterns. The PPV films obtained on the silicon wafers are semicrystalline and produce highly conducting (a 0.7 x 10 Scm ) graphitic films even when treated only at 850 C. Field-emission properties of some of the graphitic nanotubes are also described in this report. 

Poly(lactic acid-6-ethylene glycol-6-lactic acid) carbon dioxide + dichloro-methane HPPE 424-426... 

---