Elastomer-modified epoxy

W. A. Romanchick, J. E. Sohn, and J. F. Geibel Synthesis, Morphology, and Thermal Stability of Elastomer-Modified Epoxy Resin, in ACS Symposium Series 221 — Epoxy Resin Chemistry II, R. S. Bauer (ed.), American Chemical Society, Washington DC, 1982, pp. 85-118. [Pg.428]

Elastomer impression materials, 8 327 Elastomer-modified epoxy resins, 10 436 Elastomer-modified epoxies, 10 375-376 Elastomer production, tetrahydrofurfuryl alcohol in, 12 279... [Pg.300]

Bascom, W.D., Cottington, R.L., Jones, R.L. Peyser, P. (1975). The fracture of epoxy and elastomer modified epoxy polymers in bulk and as adhesives. J. Appl. Polym. Sci. 19 2545-2562. [Pg.360]

The toughening mechanism of elastomer modified epoxy systems is different from that of flexibilized epoxy systems and can be used in combination with them. Flexibilized epoxy systems reduce mechanical damage by a reduction in modulus or plasticization of the adhesive. This allows stress to be relieved through distortion of the adhesive, but it also generally results in a lowering of the adhesive s glass transition temperature with an accompanying reduction in heat and chemical resistance. [Pg.221]

Chen et al. (12) showed that phase separation in elastomer-modified epoxies can also be detected with much more sensitivity using small-angle X-ray scattering (SAXS). Then, the choice of the cloud point as a criterion for detecting the beginning of phase separation can be discussed. We have not performed SAXS studies on our systems because phase separation is much faster in thermoplastic-modified epoxy and the scanning time is too long. [Pg.73]

Elastomer-Modified Epoxy Resins in Coatings Applications... [Pg.1]

Elastomer-modified epoxy resin systems with more complexity to their preparation scheme have been demonstrated. Two examples suffice. Shelley and Clarke (9 ) instruct that a vulcanization procedure can be successfully employed to Improve elevated temperature properties in the cured resin mass. This step occurs subsequent to the esterification regime. It can be practiced with impunity at low rubber contents (7.5-10%) without gelation or Indeed very much viscosity Increase. Peroxides appear to be preferred over sulfur/sulfur donor systems. Table VII displays an example of this procedure with a solid DGEBA resin. [Pg.4]

Elastomer-Modified Epoxy Resins - Coatings Background... [Pg.9]

Lewis and co-workers (42) developed improved powder coatings with nitrile rubber-modification of an appropriate epoxy base (solid resin admixture) cured with an imidazoline-accelerated modified phenolic type hardener. Model coatings ground to 55 pm particle size, electrostatically applied to metals, cured 10 170°C, gave excellent therraocycling results as well as retained resistance to solvent attack. Elastomer-modified epoxy powder coatings have been covered extensively by Gelbel, Romanchick and Sohn in Chapter 5 of this volume. [Pg.9]

As previously mentioned in this chapter, carboxyl-reactive nitrile liquids appear to be the preferred modifiers for latent epoxy structural film adhesives. One of the major components used in formulating these adhesives is a solid epoxy resin of similar molecular weight (1000). This limited coatings study suggests that similar elastomer-modified epoxy resins are equally impressive in solution epoxy coatings. In addition. Table XI/Recipe 3 features a high impact coating modified with both liquid and solid carboxylated nitrile elastomers. [Pg.16]

The chemical literature reveals relatively new and varied interests for nitrile elastomer-modification of epoxy resins in diverse areas of coatings and primers. Desirable properties such as impact resistance, mandrel bend and adhesion improvement are attainable with little or no sacrifice in critical film properties. In some instances, it is documented that proper elastomer modification of select epoxy coatings will enhance corrosion and moisture resistance. This may relate to better film/substrate adhesion durability. The combined literature, journal and patent, has led to continuing study of nitrile elastomer modified epoxy coatings. [Pg.16]

Figure 2. Morphology of Cured Elastomer Modified Epoxies.

Elastomer-modified epoxy functional adduct formed EPON 58005/Hexion 3,000, 000 325 375... [Pg.81]

Yee Yee, A. F., Pearson, R. A. Toughening mechanisms in elastomer-modified epoxies Part 1. [Pg.537]

Pea Pearson, R. A., Yee, A. F. Toughening mechanisms in elastomer-modified epoxies. Part 3 The effect of cross-link density. J. Mater. Sci. 24 (1989) 2571-2580. [Pg.537]

These modifiers, however, diminish elastic modulus, tensile strength and modulus and flexural strength and modulus (28). In addition, increased toughening is brought about by lowering of T, which lowers the usage temperature, and elastomer modified epoxies do not perform well in hot-wet conditions. [Pg.521]

R.S. Drake, "Elastomer-Modified Epoxy Resins for Structural Applications", SAMPE Quarterly, 6, (4),... [Pg.405]

W.D. Bascom and S. Mostovoy, "Adhesive Fatigue Failure of an Elastomer-Modified Epoxy, ACS Org. Coat, and Plast. Preprints, , 152 (1978). [Pg.480]

In a contribution from B. F. Goodrich, Drake and Siebert extensively review the journal and patent literature since 1975 on reactive butadiene/acrylonitrile liquid and solid elastomers used in formulating epoxy structural adhesives. Areas reviewed include the preparation of elastomer-modified epoxy resins, the characterization of rubber-toughened epoxy resins, fracture mechanics and adhesive formulation and testing. [Pg.542]

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