Vs. cross-link density

Furthermore, the plot of modulus vs. cross-link density (Fig. 20) suggests the existence of two different types of network in the case of (V)-EPTM and ENB-EPDM. The network obtained from EPTM curing appears more rigid on the basis of the tensile properties values and this evidence agrees with a possible cross-link functionality higher than 4 as a consequence of the existence of conjugated unsaturations in EPTM ... 

Tack, peel, and shear vs. cross-link density of the adhesive... 

Film dissolution behavior Cross-link density gel nature chemical vs. physical. 

The value of Ci is obtained from the plot of o/2(X - A ) vs. 1A and extrapolating to 1A = 0. By comparison with the theory of elasticity, it has been proposed that Cl = 1/2 NRT, where N is cross-link density, R the gas constant, and T the absolute temperature (of the measurement). To assure near-equilibrium response, stress-strain measurements are carried out at low strain rate, elevated temperature, and sometimes in the swollen state. °... 

The compression moduli (G) are obtained as the slope of T vs. (X — X ) plot, at low strains T = G X — 2 ). Once the compression modulus is known, the effective cross-linked density v can be determined from the following equation ... 

Hydrogels were synthesized by cross-linking HA with DVS and poly (ethylene glycol)-functionalized divinyl sulfone (VS-PEG-VS). These gels were loaded with vitamin E succinate (VES) and bovine serum albumin (BSA), as models of antiinflammatory proteins and drugs, and their release kinetics were measured in vitro. The rate of release from HA-VS-PEG-VS-HA hydrogels was faster than that from HA-DVS-HA hydrogels, presumably because of the lower cross-linked density in the former (75). 

Obviously, there exists severe interplastics competition, e.g. PP vs. ABS, clarified PP vs. PS, PA, PVC, HDPE and PS (Table 10.7). A wide range of cross-linked and thermoplastic elastomer applications, from footware to automotive parts and toothbrushes, are adopting new metallocene-catalysed polyolefin elastomers (POEs). These low-density copolymers of ethylene and octene were first accepted as impact modifiers for TPOs, but now displace EPDM, (foamed) EVA, flexible PVC, and olefinic thermoplastic vulcanisates (TPVs). Interpolymer competition may also result from... 

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