Poly mobility data

Table IV. Xolecular Weight, Composition and Mobility Data for Poly(styrenesulfonate) Na Salts ...

On the other hand, Doblhofer218 has pointed out that since conducting polymer films are solvated and contain mobile ions, the potential drop occurs primarily at the metal/polymer interface. As with a redox polymer, electrons move across the film because of concentration gradients of oxidized and reduced sites, and redox processes involving solution species occur as bimolecular reactions with polymer redox sites at the polymer/solution interface. This model was found to be consistent with data for the reduction and oxidation of a variety of species at poly(7V-methylpyrrole). This polymer has a relatively low maximum conductivity (10-6 - 10 5 S cm"1) and was only partially oxidized in the mediation experiments, which may explain why it behaved more like a redox polymer than a typical conducting polymer. 

Numerous technologically important polymers, for example, many crystalline polyolefins are soluble only at the elevated temperature. Consequently, the high-temperature SEC instruments were designed, in which also dissolution and filtration of samples is performed at elevated temperature. Some SEC eluents such as hexafluoro isopropanol are very expensive, other ones are very aggressive—the extremes represent concentrated sulfuric acid [150] or hexamethyl phosphorotriamide [151] used as the mobile phase for some polyamides or cresols for polyesters [152]. Many biopolymers solicit the appropriate environment (eluent) and/or temperature of experiment below the ambient value to prevent their denaturation. Some polymers rapidly degrade in solution, for example, poly(hydroxy butyrate). These are to be separated as rapidly as possible and the data obtained should be corrected. 

A tentative reservation exists about this work. As reported, in a communication, it as yet gives no explanation for the unexpected solubility of poly(r t-butyl isocyanide) in chloroform, nor does it describe a safeguard against the mutual solubility, i.e. plasticization, of polyisocyanides, which is a possibility between the non-crosslinked, otherwise insoluble support medium and the mobile solute. Yet, the rotation data is compelling. 

Conditions capillary columns, 100 pm i.d. x 30 cm active length stationary phase poly(butyl methacrylate-co-ethylene dimethacrylate) with 0.3 wt.% 2-acrylamido-2-methyl-l -propane-sulfonic acid mobile phase, 80 20 vol./vol. mixture of acetonitrile and 5 mmol/L phosphate buffer pH 7 UV detection at 215 nm voltage 25 kV pressure in vials 0.2 MPa sample concentration 2 mg/mL of each compound injection 5 kV for 3 s. Data shown are average RSD values obtained for thiourea, benzyl alcohol, benzaldehyde, benzene, toluene, ethylbenzene, propylbenzene, butylbenzene, and amylbenzene. 

Figure 180 The range (Ze) of electrons (right ordinate) and the recombination probability [P ] for electrons (left ordinate). A comparison between the theoretical predictions according to Eqs. (153) and (328) (lines) and experiment (data points) shows good agreement for the electron mobility jie = 3.3 x 10-8 cm2/V s (a). Schematic cross-section of the EL device and monitoring of emission from two different emitters (PSu + TSA)—a blend of polysulfone (PSu) and tris(stilbene)amine(TSA), and PPV-poly(phenylenevinylene). Their thicknesses (dly d2) are subject to variation, d0 is the quenching zone of excitations by the Ca cathode (b). Adapted from Ref. 344.

The diffusion of gases through a polymer matrix is determined by the mobility of gas molecules through the matrix. The diffusion coefficient is therefore, at least partially determined by the free volume size of the polymer. It has been shown, for example, that there is a correlation between the free volume measured by PAL and the diffusivity of carbon dioxide in a seriers of polycarbonates [58], In a study of poly (trimethylsilyl propyne) (PTMSP), which has an extremely high gas permeability and diffusion coefficients, it was found that the lifetime data could be resolved into four components [59]. The longest lifetime component (T4) had a lifetime of... 

Bassler (1984) reexamined Pfister s (1977) data for TPA doped PC. Bassler suggested that the field and temperature dependencies of the mobility could be explained by arguments based on energetic disorder. Bassler extended the same argument to a series of arylalkane derivatives doped into a PC and PS (Pai et al., 1983), and charge-transfer complexes formed between 2,4,7-trinitro-9-fluorenone and poly(N-vinylcarbazole) (Gill, 1972,1976). 

This leads to typical values at room temperature of 5xlO-6m2V-1sec-1 for films of soluble PPV polymers cast from solution. At 30 K a value of 3 x 10-4 m2V-lsec-1 was obtained for poly(2,3-dibutoxy-l,4-phenylenevinylene). Comparison with ESR data shows that in PAni the intra-chain motion of negative and positive polarons is similar but that negative polarons are more mobile between chains. j... 

Fig. 3. The temperature dependence of the intra-chain charge mobility in poly-di- /-butylstannane (PD4Sn). The data illustrate the sudden change (with large hysteresis) at the solid/Uquid-crystal phase transition on cooling and heating from Ref 81. [Copyright Wiley-VCH Verlag GmbH 8c Co. KGaA. Reproduced with permission.]...

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