Strength loss factors

These difficulties with moisture control are overcome in a continuous process using a hot flue. There the residual moisture of the fabric is easily regulated by the content of steam in the air at 6-10 %, where the best compromise of the easy-care factor (ECF) and the strength loss factor (SLF) is realised. ECF includes dry and wet crease recovery angles and the Monsanto values. SLF is a combination of... 

Tetralluoroethylene polymer has the lowest coefficient of friction of any solid. It has remarkable chemical resistance and a very low brittleness temperature ( — 100°C). Its dielectric constant and loss factor are low and stable across a broad temperature and frequency range. Its impact strength is high. 

Sihcone fluids have good dielectric properties, loss factor, specific resistance, and dielectric strength at normal operating conditions, and the properties vary only slightly with temperature (59,328,350). The properties in combination with relatively low flammabiUty have led to the use of siUcones in transformers and other large electrical appHcations (351). The dielectric constant of a 1000-cSt oil is 2.8 at 30°C and 2.6 at 100°C. The loss factor is low,... 

Perfluorinated thermoplastics are excellent insulators even in wet environments, with high resistivities and dielectric strengths, and very low loss factors. 

Some important dielectric behavior properties are dielectric loss, loss factor, dielectric constant, direct current (DC) conductivity, alternating current (AC) conductivity, and electric breakdown strength. The term dielectric behavior usually refers to the variation of these properties as a function of frequency, composition, voltage, pressure, and temperature. 

This equation implies that the relaxation strength of a molecular motion passes through a maximum at AH° = 2.4 RT and that for AH° = 0 no relaxation process can exist. An equation for the loss factor tan 6 derived from this theory was attempted81 for the... 

Eq. (9.20) shows that, for a small gap and at low field strengths, the ratio (tan 5)/ p of a high-permeability low-loss material is independent of the gap width and is therefore a useful material constant in the pot-core context. It is often referred to as the magnetic loss factor but is clearly quite different in character from the dielectric loss factor (see Section 2.7.2). It indicates that a reduction in permeability due to the introduction or enlargement of a gap is accompanied by a proportionate reduction in tan (5m (or increase in Qm). 

The radiative losses can be calculated using the conventional equations [11]. The temperature rise dependence contains terms for the electric field strength, dielectric loss factor, heat capacity, and emissivity, and many of these are also temperature dependent. As a result, the complete theoretical analysis of dielectric heating is mathematically very complex [1],... 

Polymer Izod impact strength (j/m) 7f> (K) hard ness Ball indentation hardness (107 N/m2) Shore D hardness Friction coefficient (-) resistance (ASTM- D1044) (Taber) (mg/lOOOc) Abrasion loss factor (DIN 53516) (mg) Polymer ref. nr. in figures (cf. Table 13.12) ... 

Dimethyldichlorosilane. Because dimethyldichlorosilane has been polymerized to a silicone polymer on cotton fabrics to impart stain and water resistance and can be applied as a vapor, this agent was examined as a possible consolidant. This treatment also improves fabric hand, resistance to chemicals and weathering, resistance to abrasion (by reducing friction), and reduces the tensile strength loss when resin finishes are applied all factors that should make the material a desirable and effective consolidant. The reactions involved are as follows ... 

For the DMA trace in Fig. 35—typical for almost all reported literature data—it is obvious that both ac- and -relaxations are more pronounced for the /1-nucleated material than for its non-nucleated counterpart suggesting both its amorphous and crystalline phases to be more mobile. Varga showed the progressive increase of the maximum of the loss factor, tan 8, as Kfj was progressively increased from 0 to 75% [137]. This improved damping obviously favors fracture resistance [48,72,77,190]. Detailed correlations between the intensity of the relaxations and the impact strength in -nucleated PP would be beyond the scope of this review they are published elsewhere [111, 191]. 

The field strength and the frequency are dependent on the equipment, while the dielectric constant, dissipation factor, and loss factor are material-dependent. The electric field strength is also dependent on the location of the material within the microwave/radio-frequency cavity (Turner and Ferguson, 1995), which is one reason why domestic microwave ovens have rotating turntables (so that the food is exposed to a range of microwave intensities). This mechanism is the major one for the generation of heat within materials by these electromagnetic fields. 

Electrical properties Resistivity Conductivity Dielectric constant Loss factor Breakdown strength Electromechanical coupling constant... 

The electrical properties of interest for ceramics include conductivity, resistivity, dielectric breakdown strength, dielectric constant, loss factor, and electromechanical coupling. Most ceramics do not have high electrical conductivity, and thus ceramics have found application as electrical insulators for many years. The electrical insulating capability of some ceramics is also retained under high electric field this is referred to as high dielectric breakdown strength... 

The stress-decay data given In Figure 2 for poly[plvalolactone-b-lsoprene-b-plvalolactone)-g-plvalolactone] was obtained on fibers protected with large amounts of antioxidant. If air autooxldatlon Is an Important factor In strength loss, use of a polymer backbone... 

Implanted polymeric materials can also adsorb and absorb from the body various chemicals that could also effect the properties of the polymer. Lipids (triglycerides, fatty acids, cholesterol, etc.) could act as plasticizers for some polymers and change their physical properties. Lipid absorption has been suggested to increase the degradation of silicone rubbers in heart valves (13). but this does not appear to be a factor in nonvascular Implants. Poly(dimethylsiloxane) shows very little tensile strength loss after 17 months of implantation (16). Adsorbed proteins, or other materials, can modify the interactions of the body with the polymer this effect has been observed with various plasma proteins and with heparin in connection with blood compatibility. 

M. Mandels I would like to ask what you think your A factor from Myrothecium is now (Since in your present work you equate wet strength loss with Cx) You did have that factor separated, as I remember it, from Cx ... 

Common PS is atactic and amorphous. It has good optical clarity, low dielectric loss factor, modulus E = 3.2 GPa, strength o = 45-65 MPa, density p = 1050 kg/m and CUT = 50-70°C. Because of brittleness and low chemical resistance the demand for neat PS has decreased, and except for foaming, PS is rarely used. PS can also be polymerized into crystalline forms isotactic (iPS) or syndiotactic (sPS) with T = 230 or 272°C, respectively. The former was polymerized using Ziegler-Natta catalyst [Ishihara et al., 1986], while the latter using a single-site metallocene titanium-based catalyst [Imabayashi et ah, 1994]. 

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