Showing papers in "Analytical Chemistry in 1949"

Infrared Analysis of Low Temperature Polymers

Abstract: MOST of the rubberlike polymers (both natural and synthetic) are diene addition polymers or copolymers. In diene polymerization, addition may take place in several ways. With butadiene, for example, cis-1,4, trans-1,4, and 1,2 addition are all possible (Figure 1). With substituted butadienes, such as isoprene, there is the additional possibility of 3,4 addition. (Resonance considerations, 5, indicate that addition will normally be “head to tail.”) Natural rubber is polyisoprene, that is all,