A-B-A block copolymers which consist of poly(norbornene-co-1-octene) and atactic polypropylene (PP) segments were synthesized by using ansa-fluorenylamidotitanium complex as a catalyst varying the ratio of norbornene, 1-octene, and propylene. The copolymer was obtained quantitatively with high molecular weight (>100,000) and narrow molecular weight distribution (polydispersity index, <1.5). A-B block copolymers of poly(norbornene-co-1-octene) and poly(methyl methacrylate) (PMMA) was also obtained by the same procedure. Mechanical and optical properties of these copolymer films, which were obtained by solution casting process, were also investigated. Introduction of PP soft segment greatly improved mechanical properties, keeping their high transparency. Introduction of PMMA block also increased the tensile strength. (c) 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 267-271