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首页> 外文期刊>RSC Advances >Synthesis and characterization of novel dumbbell shaped copolymers poly(ethylene oxide)(x)-b-polystyrene-b-poly(ethylene oxide)(x) with tunable side arms by combination of efficient thiol-ene addition reaction with living polymerization mechanism
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Synthesis and characterization of novel dumbbell shaped copolymers poly(ethylene oxide)(x)-b-polystyrene-b-poly(ethylene oxide)(x) with tunable side arms by combination of efficient thiol-ene addition reaction with living polymerization mechanism

机译：高效硫醇-烯加成反应与活性聚合机理相结合的新型哑铃形共聚物聚环氧乙烷（x）-b-聚苯乙烯-b-聚环氧乙烷（x）的合成与表征

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A series of novel dumbbell shaped copolymers poly(ethylene oxide)(x)-b-polystyrene-b-poly(ethylene oxide)(x) (PEOx-b-PS-b-PEOx, x = 1, 2, 3) composed of different numbers of hydrophilic PEO and hydrophobic PS segments were prepared by combination of living anionic polymerization (LAP) and ring opening polymerization (ROP) mechanisms, and the efficient thiol-ene addition reaction was also adopted. First, the functional polystyrene with one hydroxyl group and one allyl group at each end (AGE-PS-AGE) was synthesized by the LAP of St monomers followed by the capping reaction with allyl glycidyl ether (AGE). Subsequently, by thiol-ene addition reaction with 2-mercaptoethanol (ME) and 3-mercapto1,2-propanediol (MP), one allyl group on the AGE-PS-AGE was transformed into one or two hydroxyl groups to synthesize the functional polystyrene with two hydroxyl groups at both ends (ME-PS-ME) or three hydroxyl groups at both ends (MP-PS-MP). Then, the copolymers PEOx-b-PS-b-PEOx were achieved by ROP of EO monomers using AGE-PS-AGE, ME-PS-ME and MP-PS-MP as macro-initiators. The target copolymers and their precursors were fully characterized by GPC, H-1 NMR and C-13 NMR measurements. The crystallization behavior of copolymers with different topologies and compositions was investigated by DSC, XRD and POM instruments, and the results showed that the topologies (compared to the compositions) tend to make the primary contribution to the crystallization behavior.
机译：一系列新颖的哑铃状共聚物，聚环氧乙烷（x）-b-聚苯乙烯-b-聚环氧乙烷（x）（PEOx-b-PS-b-PEOx，x = 1、2、3）结合活性阴离子聚合（LAP）和开环聚合（ROP）机理制备了不同数量的亲水性PEO和疏水性PS链段，并采用了有效的硫醇-烯加成反应。首先，通过St单体的LAP合成随后在末端具有一个羟基和一个烯丙基的官能聚苯乙烯（AGE-PS-AGE），然后与烯丙基缩水甘油醚（AGE）进行封端反应。随后，通过与2-巯基乙醇（ME）和3-巯基1,2-丙二醇（MP）的硫醇-烯加成反应，将AGE-PS-AGE上的一个烯丙基转化为一个或两个羟基以合成功能性聚苯乙烯两端带有两个羟基（ME-PS-ME）或两端带有三个羟基（MP-PS-MP）。然后，使用AGE-PS-AGE，ME-PS-ME和MP-PS-MP作为大分子引发剂，通过EO单体的ROP制备共聚物PEOx-b-PS-b-PEOx。通过GPC，H-1 NMR和C-13 NMR测量充分表征了目标共聚物及其前体。用DSC，XRD和POM仪器研究了具有不同拓扑结构和组成的共聚物的结晶行为，结果表明，拓扑结构（与组成相比）倾向于对结晶行为起主要作用。

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