Poly , PDES

Poly[(p-butoxyphenyl)phenylsilane] (PBPPS) has been employed as an emissive layer of an organic EL device.95 PBPPS was spin coated onto an uniaxially oriented poly(diethylsilane) (PDES) ultrathin film. Polarized NUV-EL was observed and the polarization direction was found to be identical with the drawing direction of the friction-transfer process for the PDES film, indicating that PBPPS in the emissive layer was aligned parallel to the uniaxial orientation of PDES. 

Ulanski et al. (1990) described hole mobilities of poly(paracyclophane) (PDE) and PDE doped with 4% tetracyanoethylene (TCNE). The field dependencies were described as log i < E. The temperature dependencies were described by an Arrhenius relationship with a field-dependent activation energy. For PDE, the zero-field energy was 0.80 eV. The incorporation of TCNE resulted in an increase in mobility of approximately an order of magnitude. The authors suggested that this is caused by a decrease in the plane-to-plane distance in a cyclophane unit due to complexing with TCNE. 

Figure 10. Torsional potential of CzHs-Si bond in poly(diethylsiloxane) (PDES) in solid and liquid states. PDES exists in two crystalline forms, each of which has two isomorphic forms because of ethyl group reorientation, which has an activation energy of 9.3 kcal/mol (theoretical value, 9.4 kcal/mol). Experimental values were obtained from reference 16.

Poly(trichloroethyl methacrylate) (PTCEM) is a polymer electron resist with a high glass transition temperature, Tg = 126° C. It is soluble in many common organic solvents. The plasma etch rate of the polymer is relatively high (8). In our PDE work, PTCEM has been used as the base polymer. Several monomer/PTCEM mixtures have been evaluated as a PDE. 

Octadecyl methacrylate (ODMA) can be polymerized by electron beam irradiation (9). When ODMA is used as the monomer with PTCEM as the base polymer, the resolution and line profile of the PDE is poor. This poor performance may be in part due to the low glass transition temperature of poly(octadecyl methacrylate) (PODMA) and the small plasma etch rate difference between PODMA and PTCEM. 

MAJOR APPLICATIONS Comonomer for low-temperature silicone rubbers for example, poly(dimethyl-diethyl)siloxane. Low molecular weight PDES is used in Russia as basis for low- and high-temperature silicone oils, greases, and lubricants. ... 

PDMS, see poly(dimethyl siloxane) PDES, see poly(diethyl siloxane)... 

A number of copolymers of MDE and PDE based DETOSU poly (ortho esters) were examined w ith XPS by De Matteis et al. (1993) and the surface elemental compositions were found to be in accord with the bulk compositions of the copolymers. 

The polymer poly(diethylsiloxane) (PDES) [-Si(0C2H5)20-] is one of the most widely studied systems. " The work on this system includes stmctural changes during transitions, effects... 

Linear PDES is the first member of the poly(di-n-alkylsiloxane) family, which exhibits an LC state. The mesophase of PDES is thermotfynamically stable for molecular weights above 28 000 g mol. The temperature window of the mesophase stability can be as large as 70 °C. An interesting feature of PDES is that its mesophase is stable at room temperature, which makes PDES an interesting objert for the studies of the LC phase formation and behavior. Besides its columnar mesophase for which a monodinic stmcture was su ested, PDES exhibits four crystaUine modifications termed uj, U2 and Pi, Scanning... 

The structure of poly(diethylsiloxane) (PDES) has been characterised using O solid-state NMR. O NMR of 0-enriched PDES was measured on the low-temperature p(l) phase, the high-temperature p(2) phase, the two-phase system consisting of the liquid crystal and isotropic liquid phase and the isotropic phase. " ... 

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