The pyrolysis-gas chromatography (pyrolysis-GC) is a useful technique for the characterization and analysis of polymers.Styrene-butadien rubber (SBR) is a copolymer of styrene and butadiene. Butadiene unit can have three different components, 1,2-, cis-1,4-, and trans-1,4-units. Thus,SBR can have various miscrostructures depending on thecomponent ratios of the styrene, 1,2-, cis-1,4-, and trans-1,4-units. Polymerization of SBR is performed by solution and emulsion processes. SBR is widely used for tread compounds of a tire. The major pyrolysis products of SBR are butadiene, 4-vinylclcyohexene, and styrene. In the recent work, an important pyrolysis product formed from the 1,2-unit was reported. 1,4-Cychoheptadiene is formed from only the butadiene sequence including the 1,2-unit. 居里點熱裂解儀