Two-component structure

The soft segments made from asymmetrical (amorphous) polyols are important for two-component structural adhesives and one-component moisture-curing adhesives. These materials are applied and usually cured at room temperature. 

The analysis of the shake up satellites in terms of a two component structure leads to the correlation shown in Fig. 46 where for convenience the data has been analyzed in terms of the coulomb integrals of the substituents. 

The esters form a particularly interesting group in that each molecule is composed of two structural units joined together by the characteristic ester formation. One of the two component structures comes from an alcohol and the other from an acid. For example,... 

Some more recent examples of epoxy-urethane hybrids in one- and two-component structural adhesives are noted below. These have had success in the automotive industry where high impact strength, fatigue resistance, and high bond strength to a variety of substrates are valued characteristics. 

Woutersen S, Emmerichs U, Bakker HJ. Femtosecond mid-IR pump-probe spectroscopy of liquid water evidence for a two-component structure. Science 1997 278 658-660. 

Both of the control structures discussed in Sec. 2.7.2 (CSl and CS4j work because they detect the inventories of the reactant components A and B in the system and bring in fresh feed streams to balance the consumption of the two components. Structure CSl does this by using the liquid level in the reflux drum of the second column as an indicator of the amount of A in the system and the liquid level in the base of the first column as an indicator of the amount of B in the system. Structure CS4 uses a composition analyzer to measure directly the concentration of one of the reactants in the reactor. But both of these structures lack a direct handle on production rate. 

Lattice geometry, crystal morphology and cleavage all confirm that the two component structures are layer-like and semi-commensurate in both intralayer directions b and... 

According to Drits (private communication, 1979) structure-factor calculations for the hM reflections of tochilinite I show that the reflections with k = 5n and k = 6n ought to be among the strongest reflections because of the subperiodidties of metal atoms in the two component structures. On the X-ray powder patterns and rotation photographs... 

In Eq. (3.47)

field operator of two-component structure, a are the Pauli matrices and the electron-electron interaction reduces to the Coulomb interaction, denoted by H e- As usual, the gauge term proportional to... 

In Eq.(122) 0(x) denotes the weakly relativistic field operator which has a two-component structure. The electron-electron interaction Hge reduces to the Coulomb interaction. However, the interaction is not relevant for the present... 

Robotized dispensing of a high-quality bead of two-component structural adhesives (epoxy, polyurethane, acrylic) is possible with servo-powered equipment. Positive displacement pumps control the mix ratio and flow of low to high viscosity adhesives and sealants. 

Broadly defined, composite materials include all two-component structures however, discussions in this monograph have been limited to composites containing at least one polymeric component. Even so, many important subclasses of polymer-based composites were either treated extremely cursorily or omitted entirely. It is valuable, however, to classify the known types of polymer-based composites, since such a scheme might promote the discovery or development of yet new types. Such a classification scheme should have a topological foundation (Chinn and Steenrod, 1966),... 

Two-component Structures Containing Secondary Amides and Pyridine Derivatives... 

Designed for epoxy resin systems, Anquamine 401 and Ancamide 2424 (by Air Products) are a modified aliphatic curing agent at 70% solids in water for waterborne two-component epoxy coatings and a modified polyamide curing agent for liquid epoxy resins in two-component structural adhesives. 

Rather soon after the nuclear magnetic reasonance (NMR) method was applied successfully to solid state physics, NMR was applied to the study of physical properties of polymers. To the best of our knowledge, a short paper by Wilson and Pake published in 1952 on the two-component structure of the proton NMR spectrum of polyethylene was the first paper in the field of NMR application to polymer science After that, many papers of NMR studies in polymer physics were published and many novel informations concerning molecular motions and structures of polymeric materials were presented. Recent advances in hardware of instrumentation of NMR measurement opened its application even to the medical and tomographic field Electron paramagnetic resonance (EPR or ESR), on the other hand, was applied to polymer science in the middle of the 1950s in the studies of polymerization and irradiation effects and its application to molecular motion study was established in the first half of the 1960s. 

In protein 2, the two component structures, one red and the other yellow, forming two domains, are packed to form a V shape. The intradomain disulfide bonds are in cyan. 

Figure 9.12 Structural bonding application for a reinforced plastic bumper assembly for a truck. The equipment dispenses a two-component structural adhesive onto the bumper assembly before it is integrated into the truck. In production, this is typically done robotically with a manual backup system (shown). The system being used is a See-Ro 488 meter/mix system the dispense gun in the picture is model 2200-250-000 dual-spool Snuf-Bak dispense valve that utilizes a No-Rush disposable static mixer nozzle. (Photo provided by Sealant Equipment and Engineering, Inc.)...

The term aerobic adhesives is being advanced for a series of two-component structural acrylic adhesives which have reduced sensitivity to oxygen inhibition. In contrast to the anaerobic adhesives, they can be applied to porous surfaces and to fill wider gaps, e.g., up to 60 mils. ... 

Four different adhesives were tested, details of which can be found in O Table 30.1. The adhesives were AVI 19, a one-part epoxy manufactured by Hexcell 9245, a structural bonding tape (SBT) manufactured by 3M 3532, a two-part polyurethane also manufactured by 3M and Hysol XEA 9359.3, which is a two-component structural adhesive that exhibits high peel and high tensile lap shear strength. 

Optical fibers are, at least, composed of two components in order to accomplish total reflection of optical rays. SIMS depth profiling is promising to analyze the two-component structures. The profiling was done for the optical fibers composed of PVDF (clad) and PMMA (core) (2). Similar to the last section, the intensities of, ... 

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