A block copolymer having a numerical average molecular weight of 30,000 to 300,000 composed of two or more blocks consisting of aromatic vinyl units having a numerical average molecular weight of 2500 to 40,000, and one or more blocks containing a vinyl bonding content of not less than 40%, having a peak temperature of primary dispersion of tan δ at least 0°C, and consisting of isoprene or isoprene-butadiene units in which at least a part of carbon-carbon double bonds may be hydrogenated, and a composition consisting of the block copolymer. The composition can provide a vibration-damping material.
一种嵌段共聚物,其数值平均分子量为 30,000 至 300,000,由两个或多个嵌段组成,这些嵌段由数值平均分子量为 2500 至 40000 的芳香族
乙烯基单元和一个或多个
乙烯基键含量不低于 40% 的嵌段组成,初分散峰温度 tan δ 至少为 0°C,由
异戊二烯或
异戊二烯-
丁二烯单元组成,其中至少有一部分碳碳双键可以氢化,以及一种由该嵌段共聚物组成的组合物。该组合物可提供一种减震材料。