Polymer pressures

Title Process for Producing Polysilsesquioxane Graft Polymer, Pressure-Sensitive Adhesive, and Pressure-Sensitive Adhesive Sheet... 

Turro, N. J. and C. J. Chung. 1984. Photoluminescent probes for water-water soluble polymers, Pressure and temperature effect on a polyol surfactaWtecromoleculeSl7 2123-2126. 

Solid polymer Pressure difference allowed High over potentials in some... 

Tait parameter for the polymer, pascals 0.0894, a universal constant for polymers pressure, pascals temperature, kelvins... 

Mathematical description of the process of polymer melting in the extrusion channel is complex when ultrasound is used. The description requires firstly, consideration of the mass flow of the polymer, knowledge of the flow characteristics of the melt, the temperature and pressure of extrusion, sizes of the channel and frequency of ultrasonic oscillations. Secondly, coefficient of swelling of the extrudate, effective viscosity of polymer, pressure of melt, and frequency of oscillations. 

Wang, Y. Y, Nakanishi, H., Yean, Y. C., and Sandreezki, T. C., Positron annihilation in amine-cured epoxy polymers pressure dependence, J. Polym. ScL, B, 28, 1431-1441 (1990). 

Uses Antioxidant, antiozonant for petroleum-based and synthetic lubricants, rubbers, and plastics (PU) scorch retarder for CR in food-pkg. adhesives in closure-sealing gaskets for food containers antioxidant/stabilizer for food-grade polymers, pressure-sensitive adhesives antioxidant in food-contact rubber articles for... 

Figure 2. Polymer pressure drop versus Reynolds number, 6.7 ppm of Polyox WSR 301. O Upstream filter Second filter 35 nim downstream the fi rst f i1 ter.

Of these featores, the pressure-dependence of SCF properties dominates or influences virtually every process conducted on polymers. Pressure governs such properties as density, solubility parameter, and dielectric constant changes of more than an order of magnitude are common when pressure is sufficiently increased to transform a gas into a supercritical fluid. This chapter primarily compiles experimental data on the pressure dependence of physical properties of fluid phase polymer-SCF mixtures. Phase equilibria are addressed, including the solubility of polymers in SCFs, the solubility of SCFs in liquid polymers, and the three-phase solid-fluid-fluid equilibria of crystalline polymers saturated with SCFs. Additional thermodynamic properties include glass transition temperature depressions of polymers, and interfacial tension between SCF-swollen polymers and the SCF. The viscosity of fluid phase polymer-SCF mixtures is also treated. 

Frances, R.S. and Edelman, R., Ultraviolet radiation-curable acrylic polymer pressure sensitive adhesives, Japanese Patent JP 200004-4887, 2000 Frances, J.M., Delchet, L., Amaut, C., Gambut, L., Pressure-sensitive adhesive silicone compositions. World Patent 0310257, CA-2003-97495 2003. 

Thermodynamics of Polymer Systems Solid, Molten, and Thermally Softened TABLE 2-1 Polymer Pressure-Volume-Temperature Data... 

Both Eqs. (2-21) and (2-22) generally predict polymer pressure-volume-temperature to within 1% or less. Again, the relative ease of use of Eqs. (2-21) and (2-22) should be re-emphasized. All that is needed are Tg po and Figs. 2-10 -2-14. Hence, it is possible rapidly to estimate pressure-volume-temperature data for a given polymer. Furthermore, the glass temperature can be estimated for any polymer from one point of pressure-volume-temperature data. 

To a solution of 0.25 g (0.5 mmol) of rrans-[Ir(en)2Cl2]C104 in 30 ml of water was added 0.51 g (5.0 mmol) of NaBr. The reaction mixture was placed in a polymer pressure bottle and kept at 140° for 4 hr. At the end of this time, the solution was concentrated on a steam bath to give a volume of... 

The barrel must be extremely strong in order to withstand the high liquid polymer pressures developed it has characteristics analogous to those of the barrel of a field gun, which is the origin of the name. The size of the extruder is defined by the internal diameter, which is normally in the range 2.5 to IS cm. 

Fig.7 Schematic illustration of the initial polymerization in a catalyst pore. Polymer chains shown. Length of arrows indicate relative polymer pressure. 100 A ...

Slow unlocking then occurs, giving slow polymerization in the pore, giving slowly increasing polymer pressure. 

A fragment ruptures when the mean polymer pressure within the pores reaches the critical pressure for the silica network of that fragment. 

Normally adhesives are applied in a liquid state to the substrate, wet the surface, and solidify to generate a bond, for example by evaporation of a solvent, cooling of a hot melt, or formation of a cross-linked polymer. Pressure-sensitive adhesives do not change their physical state, but they also must wet the surface of the substrate like a liquid and sustain loads like a solid. There have been many discussions and investigations concerning how they fulfill these conflicting demands. 

In spile of the case of construction, robustness, and high sensitivity, the lack of a truly static response of a ferroelectric polymer pressure transducer represents a serious limitation to widespread use of this type of device. Several techniques can be conceived in order to overcome this drawback [21] (such as the parallel use of a strain gauge sensor and the use of this transducer to calibrate at intervals the signal detected by the PVDF sensor), but excessive complexity and costs are usually added to the originally simple and cheap design of the piezoelectric polymer catheter-tip sensor. 

Design procedures included laboratory tests on polymer rheology, relative permeability, shear degradation, screen factor, stability, and salinity effects. Computer simulations were performed to predict recoveries and to examine optimum polymer concentration. Field injectivity tests were conducted to examine injectivity behavior with time and to gain experience in surface handling of the polymer. Pressure-falloff tests were conducted in conjunction wiA the injectivity tests. Finally, the prqiamtion involved design of the polymer-injection plant and analysis of costs. 

Frances RS, Edehnan R. Ultraviolet radiation-curable acrylic polymer pressure sensitive... 

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