Isoprene/Styrene Tapered Multiblock Copolymers with up to Ten Blocks: Synthesis, Phase Behavior, Order, and Mechanical Properties
Isoprene/Styrene Tapered Multiblock Copolymers with up to Ten Blocks: Synthesis, Phase Behavior, Order, and Mechanical Properties
复制标题
DOI：
10.1021/acs.macromol.8b01961
复制
发表时间：
2018-12
期刊：
影响因子：
5.5
通讯作者：
M. Steube;Tobias Johann;E. Galanos;Michael Appold;Christian Rüttiger;M. Mezger;M. Gallei;A. Müller-A.-M
中科院分区：
文献类型：
--
作者：
M. Steube;Tobias Johann;E. Galanos;Michael Appold;Christian Rüttiger;M. Mezger;M. Gallei;A. Müller-A.-M
异戊二烯和苯乙烯在环己烷中的活性阴离子共聚提供递变嵌段共聚物，由于高度不同的竞聚率rI = 12.8和rS = 0.051。重复添加这些单体的混合物，以产生具有多达10个嵌段（1 ≤ n ≤ 5）的（AB）n型递变多嵌段共聚物结构，从而将聚合物链细分为交替的柔性聚异戊二烯（PI）和刚性聚苯乙烯（PS）链段。在100 g规模上制备了三个系列的具有近似分子量为80、240和400 kg/mol的良好定义的递变多嵌段共聚物。通过这种合成策略，聚合物链被分为二，四，六，八，和十嵌段锥形多嵌段结构。由于聚合的活性性质，获得在1.06-1.28（十嵌段）范围内的低分散性。为了确保在加入异戊二烯/苯乙烯混合物之前单体完全转化，采用动力学蒙特卡罗模拟，允许…
The living anionic copolymerization of isoprene and styrene in cyclohexane affords tapered block copolymers due to the highly disparate reactivity ratios of rI = 12.8 and rS = 0.051. Repeated addition of a mixture of these monomers was exploited to generate tapered multiblock copolymer architectures of the (AB)n type with up to 10 blocks (1 ≤ n ≤ 5), thereby subdividing the polymer chains in alternating flexible polyisoprene (PI) and rigid polystyrene (PS) segments. Three series of well-defined tapered multiblock copolymers with approximate molecular weights of 80, 240, and 400 kg/mol were prepared on the 100 g scale. Via this synthetic strategy polymer chains were divided in di-, tetra-, hexa-, octa-, and decablock tapered multiblock structures. Because of the living nature of the polymerization, low dispersities in the range 1.06–1.28 (decablock) were obtained. To ensure full monomer conversion prior to the addition of the isoprene/styrene mixture, kinetic Monte Carlo simulation was employed, permitting...