Semi-crystalline, thermoplastic polyolefin block copolymers comprising: (A) A first polyolefin A block comprising isotactic poly(1-butene) (iPB); (B) A polyolefin B block comprising an ethylene and/or alpha-olefin/1-butene copolymer or terpolymer; and (C) A second polyolefin A block comprising isotactic poly(1-butene) (iPB); the A and B blocks bonded to one another to form a block copolymer in which the first and second polyolefin A blocks are joined to and separated by the polyolefin B block. In one embodiment the polyolefin block copolymer is a BAB block copolymer.
                            半结晶热塑性聚烯烃嵌段共聚物,包括(A) 第一聚烯烃 A 嵌段,包括异actic 聚(1-
丁烯)(iPB);(B) 聚烯烃 B 嵌段,包括
乙烯和/或 α-烯烃/1-
丁烯共聚物或三元共聚物;以及 (C) 第二聚烯烃 A 嵌段,包括异actic 聚(1-
丁烯)(iPB);A 嵌段和 B 嵌段相互粘合以形成嵌段共聚物,其中第一和第二聚烯烃 A 嵌段与聚烯烃 B 嵌段连接并被聚烯烃 B 嵌段分隔。在一个实施方案中,聚烯烃嵌段共聚物是一种 BAB 嵌段共聚物。