Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Properties of Common Cross-Linked

Properties of Common Cross-Linked Silicone Stationary Phases.8-21... [Pg.1409]

PROPERTIES OF COMMON CROSS-LINKED SILICONE STATIONARY PHASES... [Pg.1431]

The most commonly reported physical properties of radiation cross-linked natural rubber and compounds made from it are modulus and tensile strength, obtained from stress-strain measurements. Figure 5.5 illustrates some of the results obtained from gum rubber and from a natural rubber compound reinforced by HAF carbon black. In Figure 5.6 the tensile strength of radiation cured gum is compared to that of vulcanizates cured by sulfur and by peroxide. ... [Pg.105]

Elastomeric Modified Adhesives. The major characteristic of the resins discussed above is that after cure, or after polymerization, they are extremely brittie. Thus, the utility of unmodified common resins as stmctural adhesives would be very limited. Eor highly cross-linked resin systems to be usehil stmctural adhesives, they have to be modified to ensure fracture resistance. Modification can be effected by the addition of an elastomer which is soluble within the cross-linked resin. Modification of a cross-linked resin in this fashion generally decreases the glass-transition temperature but increases the resin dexibiUty, and thus increases the fracture resistance of the cured adhesive. Recendy, stmctural adhesives have been modified by elastomers which are soluble within the uncured stmctural adhesive, but then phase separate during the cure to form a two-phase system. The matrix properties are mosdy retained the glass-transition temperature is only moderately affected by the presence of the elastomer, yet the fracture resistance is substantially improved. [Pg.233]

The thermoplastic rubbers have properties similar to those of the cast polyurethane rubbers but, because of the absence of covalent cross-links, have rather higher values for compression set, a common problem with thermoplastic rubbers. Their main uses are for seals, bushes, convoluted bellows and bearings. [Pg.790]

HA is the basis of the lubricant and "shock absorber" properties of synovial fluid. Osteoarthritis is the most common disease of joints, and correlates with a deterioration of synovial HA. Intra-articular administration of HA is a widely used therapy for OA, providing relief of pain, and other symptoms. The first arthroscopic viscosurgical application of HA was in 1989 [150]. There are several preparations of partially cross-linked HA that are now used in this context. However, only one preparation will be discussed here. Synvisc , also known as hylan G-F 20, is a viscoelastic fluid containing modified HA produced from rooster combs. Hylans are cross-linked derivatives of HA. Synvisc contains hylan A (average molecular size 6x10 Da) and hylan B, a hydrated gel in a buffered salt solution. [Pg.818]

Metal-Ion Cross-Linker Chemistry. The most commonly used metal-ion cross-linkers are titanates, zirconates, and borates. Titanate and zirconate gels display significantly different properties than borate gels, and these differences indicate the different nature of the cross-linking for the two types of ions. For example, gels produced by transition metal ions are more thermally stable than borate gels and do not recover viscosity after exposure to shear. [Pg.93]

As composite membrane performances are mainly determined by the film structure (i.e., pore dimension, thickness, roughness, and hydrophilicity) and its chemical properties (i.e., cross-linking, functional groups, and bonds), fundamental understanding on the effects of different monomers on composite membrane properties is necessary in order to tailor the desired membrane structure and separation performance. Table 2.4 shows the organic structures of commonly used and newly reported monomers in the thin-fihn... [Pg.16]

Presented in this chapter, mathematical description of interconnected cross-linked polymers viscoelastic and electromagnetic properties was developed on the base of common heredity s theory. In the main new and key moment was momentary components of shear pliability and strain electromagnetic susceptibility modeling with the... [Pg.57]

Section I (Novel Membrane Materials and Transport in Them) focuses on the most recent advances in development of new membrane materials and considers the transport parameters and free volume of polymeric and even inorganic membranes. Kanehashi et al. (Chapter 1) present a detailed review of hyperbranched polyimides, which are compared with more common cross-linked polyimides. These polymers with unusual architecture were studied in the hope that they would show weaker tendency to plasticization than conventional linear polymers. However, many representatives of this new class of polymers reveal relatively poor film forming properties due to absence of chain entanglement. Nonetheless, some promising results obtained can show directions of further studies. [Pg.386]


See other pages where Properties of Common Cross-Linked is mentioned: [Pg.209]    [Pg.261]    [Pg.864]    [Pg.235]    [Pg.272]    [Pg.569]    [Pg.430]    [Pg.94]    [Pg.294]    [Pg.235]    [Pg.272]    [Pg.6438]    [Pg.428]    [Pg.1741]    [Pg.221]    [Pg.216]    [Pg.6437]    [Pg.8]    [Pg.566]    [Pg.287]    [Pg.93]    [Pg.282]    [Pg.110]    [Pg.25]    [Pg.372]    [Pg.276]    [Pg.370]    [Pg.331]    [Pg.93]    [Pg.1430]   


SEARCH



Common properties

Properties of cross-linked

© 2024 chempedia.info