Assisted by a versatile programmed monomer addition mode, the well-defined periodic Poly(styrene-per-isoprene) [Poly(St-per-Is)] copolymers are innovatively prepared by living anionic polymerization (LAP) of a general monomer pair of styrene and isoprene. For comparison, the random Poly(St-ran-Is) and diblock PS-b-PI copolymers are also synthesized. The Differential Scanning Calorimetry (DSC) analysis shows that the periodic Poly(St-per-Is) copolymers always have relatively higher glass transition temperature (T_gs) than the corresponding random Poly(St-ran-Is) analogues with the same molar ratio [St]/[Is] and close molecular weight (MW). The T_gs of copolymers follow a general tendency of T_{g,Poly(St-per-Is)} > T_g,PS-b-PI > T_{g,Poly(St-ran-Is)}. The reason is rationalized to the different sequence of styrene and isoprene units arranged along the copolymers.

通过一个多功能编程单体添加模式的协助下，明确定义的周期性的聚（苯乙烯-每异戊二烯）[聚（步步骤骤每-Is）]的创造性活的一般单体对苯乙烯的阴离子聚合（LAP）制备的共聚物和异戊二烯。为了比较，还合成了无规Poly（St- ran- Is）和二嵌段PS- b - PI共聚物。差示扫描量热法（DSC）分析表明，所述周期性聚（步步骤骤每-Is）共聚物总是具有相对较高的玻璃化转变温度（Ť_克比相应的无规聚或多个）（步步骤骤跑-Is）类似物具有相同的摩尔[St] / [Is]的比值和接近的分子量（MW）。这Ť_克共聚物第遵循的一般倾向Ť_{克，聚（步步骤骤每-Is）}  >  Ť_{克， PS- b -PI}  >  Ť_{克，聚（步步骤骤跑-Is）} 。原因是沿共聚物排列的苯乙烯和异戊二烯单元的顺序不同。