Stability of resins

The chemical stability of resins may be degraded due to chemical interactions with oxidizing agents. The latter interact with CH2 groups and gradually lead to the destruction of the matrix. The main oxidizing substances are... 

Table I also compares the heat stabilities of 60- and 120-mil plaques at 140 °C. The relative order of stabilities has changed slightly. The stability of Resin A in the thicker sections has equalled or surpassed the stability of the long term heat aging Resin B. Resins E, C, and H have improved their position, displacing I, the most stable resin in the 25-mil sheets, which is now third best in the 60-mil plaques and only fourth best in the 120-mil plaques.

As seen with increasing thickness (Table II), the relative stability of Resins A and D increases with decreasing temperatures. Resins B and E increased in relative stability with increasing temperatures. This may indicate that A and D are stabilized with relatively volatile phenolic antioxidants and/or synergists and that B and E contain relatively nonvolatile antioxidants which are only moderately effective. 

Jungbauer, A., Lettner, H. P., Guerrier, L., and Boschetti, E. (1974). Chemical sanitization in process chromatography. Part 2 In situ treatment of packed columns and long-term stability of resins. Bio-Pharm. 7, 37-42. 

These problems, which are well known in convectional water treatment are much more acute in effluent treatment. Many synthetic chemicals present in wastewaters can react either among themselves or with naturally occurring chemicals in the water, sometimes with unexpected results. Understanding the factors affecting the stability of resins is crucial for the successful application of ion exchange to effluent treatment. 

This section presents information and data related to thermal stability of resins and basic properties as a function of temperature. Thermal stability of fluoropolymers has special importance because of the high processing temperatures required by these thermoplastics and the toxic and corrosive nature of their degradation products. Fluoroplastics have useful properties at temperature extremes above and below ambient conditions. 

A. U. Guler, E. Guler, A.C. Yucel, E. Ertas, Effect of different polishing procedures on color stability of resin composites, J. Appl. Oral Sci. 17 (2009) 108-112. 

Uses Adhesion promoter for filled and reinforced resins (urethanes, epoxies, acrylates, phenolics), adhesives, sealants, coatings, glass fiber sizes and finishes, primers, and foundry sand binders Features Improves high-temp, resist., increases stability of resin/silane bond at high temps. 

Extremely high specific resistance augments the electrical properties and dimensional stability of resin systems where moisture absorption and corrosion resistance are of prime Importance. 

As a major component of the bonded interface, the dental tissue components have a dramatic effect of the stability of resin-tooth interface. While there is still much to learn about the composition and role of organic components in different forms of dentin and enamel, there is a consensus that the stability of the dentin matrix remains key to the long-term strength and permeability of the interface. 

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