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首页> 外文期刊>RSC Advances >Synthesis and self-assembly of a novel amphiphilic diblock copolymer consisting of isotactic polystyrene and 1,4-trans-polybutadiene-graft-poly(ethylene oxide)
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Synthesis and self-assembly of a novel amphiphilic diblock copolymer consisting of isotactic polystyrene and 1,4-trans-polybutadiene-graft-poly(ethylene oxide)

机译：由等规聚苯乙烯和1,4-反式-聚丁二烯接枝-聚环氧乙烷组成的新型两亲性二嵌段共聚物的合成与自组装

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Herein, a novel amphiphilic diblock copolymer consisting of isotactic polystyrene ( i PS) and 1,4- trans -polybutadiene- graft -poly(ethylene oxide) (1,4- trans -PBD- g -PEO), i PS- b -(1,4- trans -PBD- g -PEO), was synthesized by the combination of living coordination copolymerization and graft copolymerization. i PS- b -1,4- trans -PBD was firstly synthesized via sequential monomer addition in the presence of 1,4-dithiabutandiyl-2,2′-bis(6-cumenyl-4-methylphenoxy) titanium dichloride (complex 1) activated by triisobutyl aluminum modified methylaluminoxane (MMAO). Moreover, hydroboration of double bonds in the 1,4- trans -PBD blocks were performed with 9-borabicyclo[3.3.1]nonane (9-BBN) and subsequent oxidation by NaOH/H _(2) O _(2) to form hydroxyls. Consequently, PEO was grafted into the hydroxylated 1,4- trans -PBD block in terms of ring-opening polymerization of ethylene oxide with potassiumaphthalide as initiatior. We also described solvent-evaporation-induced self-assembly of i PS- b -1,4- trans -PBD in n -dodecane and i PS- b -1,4- trans -PBD-g-PEO in aqueous solution, which were selective solvent for 1,4- trans -PBD and for 1,4- trans -PBD- g -PEO blocks, respectively. In these cases, tetrahydrofuran (THF) was used as good and volatile solvent. These resultant i PS-containing diblock copolymers could self-assemble into spherical nano-micelles with an i PS core as amorphous agglomeration or a very low degree of crystallinity resulting from slow crystallization rate and nanoconfinement. In addition, after isothermal crystallization of i PS in the micellar cores self-assembled in n -dodecane at 120 °C for 3 hours, the micellar morphology changed from sphere-like to platelet-like. It was believed that isothermal crystallization of i PS induced the deformation of the micelles.
机译：本文中，一种新型的两亲性二嵌段共聚物，由全同立构聚苯乙烯（i PS）和1,4-反式-聚丁二烯接枝-聚环氧乙烷（1,4-反式-PBD-g -PEO），i PS- b-组成（1，4-反式-PBD-g-PEO），是通过活性配位共聚和接枝共聚合成的。首先在1,4-二硫代丁二烷基-2,2'-双（6-枯烯基-4-甲基苯氧基）二氯化钛（配合物1）存在下，通过顺序添加单体来合成i PS- b -1,4-反式-PBD由三异丁基铝改性的甲基铝氧烷（MMAO）活化。此外，在1，4-反式-PBD嵌段中的双键氢硼化反应用9-borabicyclo [3.3.1]壬烷（9-BBN）进行，然后用NaOH / H _（2）O _（2）氧化为形成羟基。因此，就环氧乙烷与引发剂钾/萘的开环聚合而言，将PEO接枝到羟基化的1，4-反-PBD嵌段中。我们还描述了溶剂蒸发诱导的正十二烷中i PS- b -1,4-反式-PBD和水溶液中i PS- b -1,4-反-PBD-g-PEO的自组装，它们分别是1，4-反式-PBD和1，4-反式-PBD-g-PEO嵌段的选择性溶剂。在这些情况下，使用四氢呋喃（THF）作为良性和挥发性溶剂。这些所得的含i PS的二嵌段共聚物可以自组装成球形i-PS胶束的纳米胶束，其为非晶团聚或结晶速率低和纳米约束导致的结晶度非常低。另外，在120℃下在正十二烷中自组装的胶束核心中的i PS的等温结晶3小时后，胶束形态从球形改变为血小板状。据信i PS的等温结晶引起胶束的变形。

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