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The use of extruders as continuous polymerization reactors for polymer synthesis is growing rapidly. By controlling the temperatures of various barrels alone without supplying additives, Xieyao Yuan et al. synthesize two kinds of styrene-isoprene copolymers with high isoprene content using reactive extrusion. The transmission electron micrograph on the cover reveals the microdomains of a styrene-isoprene diblock copolymer synthesized by adding styrene and isoprene monomers at the first and the fifth barrel, respectively. The microdomains are influenced by both the content of each phase and the molecular weight of each block. Compared with conventional polymerization reactors, extruders have the advantage of continuous bulk polymerization without any solvent. DOI: 10.1002/app.39429