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Pureland木蟲(chóng)之王 (知名作家)
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[資源]
膠黏劑基礎(chǔ)之10——聚硫橡膠膠黏劑和密封膠(英文版)
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Polysulfide polymers, first marketed in 1929, are mature products that are used in specialty adhesive and sealant applications. These important materials seem to not receive much attention today due to their restricted use, especially as adhesives, and to their competitive market displacement as sealants by silicones and urethanes. However, polysulfide polymers provide unique curing and performance properties that are attractive in many applications. The original polysulfide polymers were solid rubbery materials containing 37-82 percent bound sulfur. However, today the predominant product is the mercaptan-terminated liquid polymer (LP) that contains approximately 37 percent bound sulfur (see Figure 1). It is the high concentration of sulfur linkages that provide these products with their unique chemical properties. The liquid polysulfide polymer can be transformed in-situ from a liquid state into a solid elastomer, even at low temperatures. Polysulfide adhesives and sealants have been successful in applications requiring good moisture, solvent and ozone resistance, and good weathering and low temperature properties. However, the chemical linkages that provide these properties also contribute to poor high temperature stability and high compression set because of stress relaxation. This paper will review the historical development of these polymers as adhesives and sealants. It will also review the various types and formulations of products that are available. Finally, the paper will examine the properties and applications for these materials both as adhesives and as sealants. |
高分子電子書(shū)和資源饕餮 | 科技 | 科技o(jì)k | 膠粘劑 |
聚氨酯系列 |
木蟲(chóng)之王 (知名作家)
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