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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Surface Self-Assembly and Properties of Monolayers Formed by Reverse Poly(butylene oxide)-poly(ethylene oxide)-poly(butylene oxide) Triblock Copolymers with Lengthy Hydrophilic Blocks
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Surface Self-Assembly and Properties of Monolayers Formed by Reverse Poly(butylene oxide)-poly(ethylene oxide)-poly(butylene oxide) Triblock Copolymers with Lengthy Hydrophilic Blocks

机译：用逆转（环氧丙烷）-poly（环氧丙烷）-poly（环氧丙烷）三嵌段共聚物具有冗长的亲水性嵌段，表面自组装和单层的性质

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摘要

The surface behavior and properties of several reverse poly(butylene oxide)-poly(ethylene oxide)-poly(butylene oxide) block copolymers, BO8EO90BO8, BO12EO227BO12, BO14EO378BO14, BO20EO411BO20, and BO21EO385BO21 at the air/water interface have been analyzed by drop tensiometry, Langmuir film balance, and atomic force microscopy (AFM). The kinetic adsorption process of block copolymer chains at the air/water interface is a diffusion-controlled process, at short times. Structural rearrangements of the copolymer backbones are progressively more important as the adsorption carries on. The adsorption layers formed at the interface display evident solid-like behavior in the whole range of frequencies analyzed even at the lowest frequencies used probably as a result of the interconnection between hydrophobic ends of polymeric chains. All the copolymer display adsorption isotherm profiles are composed of four different regions in which the different characteristic regimes ("pancake, mushroom", "brush", and collapsed conformations) are observed. The differences observed between copolymers come from the different block lengths and, hence, hydrophilic to hydrophobic (BO/BO) block ratios. In this regard, it is observed that the shortest copolymer, BO8EO90BO8, having the lowest block ratio, displays the complete adsorption profile at much lower areas per molecule and within the narrowest range. Images of copolymer films transfer at solid substrates at determined transfer pressures enable having direct information about the structure and size of formed structures. In this manner, relevant differences were observed between copolymers with the shortest blocks (BO8EO90BO8, BO12EO227BO12) and those with the longest ones (BO20EO411BO20 and BO21EO385BO21). In this regard, surface circular micelles were observed for the former at low surface transfer pressures, evolving to continent-like structures first and then dewetted structures as the transfer pressure increases. Conversely, for BO20EO411BO20 and BO21EO385BO21 copolymers micelle formation is noted at lower transfer pressures than the shortest counterparts, and the formed micelles appear to be elongated, interconnected and with larger thickness. As the transfer pressure increases, attractive micellar interactions are enhanced and then-lead to formation of a dense network of interconnected micelles, first followed by an evolvement to continent-like and dewetted structures, as also observed for BO8EO90BO8, BO12EO221BO12 copolymers.
机译：通过下降张力测量分析了几种反向聚（环氧丙烷）-Pold（环氧丙烷）嵌段共聚物，Bo8EOO378bO，Bo20E 411bO20和Bo21eO411bO20的α20OO27bO12，Bo21eO411bO21的表面行为和性质已经进行了分析，朗马尔薄膜平衡和原子力显微镜（AFM）。空气/水界面处嵌段共聚物链的动力学吸附过程是扩散控制的过程，短次。随着吸附携带的，共聚物骨干的结构重排逐渐变得更加重要。在界面处形成的吸附层在即使在所使用的最低频率下也在分析的整个频率范围内，在可能的是聚合物链的疏水端之间的互连的结果，所以在分析的整个频率中，也是如此。所有共聚物显示吸附等温曲线由四个不同的区域组成，其中观察到不同的特征制度（“煎饼，蘑菇”，“刷子”和折叠构象）。共聚物之间观察到的差异来自不同的嵌段长度，因此，亲水性对疏水性（Bo / Bo）嵌段比。在这方面，观察到具有最低嵌段比的最短共聚物Bo8EO90bO8在每分子下的下部区域和最窄范围内显示完整的吸附曲线。在确定的转移压力下在固体基板下转移的共聚物膜的图像能够具有关于形成结构的结构和尺寸的直接信息。以这种方式，在与最短块（Bo8EOO90bO8，Bo12EO227bO12）和最长块（Bo20OO411BO20和Bo21EO385BO21）之间的共聚物之间观察到相关差异。在这方面，在低表面转移压力下观察到前表面圆形胶束，首先进化到大洲的结构，然后在转移压力增加时脱焊结构。相反，对于BO20EO411BO20和BO21EOO385BO21共聚物形成胶束形成比最短的对应物在较低的转移压力下，并且形成的胶束似乎是细长的，互连的厚度和更大的厚度。随着转移压力的增加，增强了吸引力的胶束相互作用，然后导致形成互连胶束的致密网络，首先是对大洲的相互同样的和脱焊结构的演变，如Bo8EO90bO8，Bo12E 2 2 1BO12共聚物。

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    Villar-Alvarez Eva; Cambon Adriana; Blanco Mateo; Pardo Alberto; Martinez Raquel; Barbosa Silvia; Valdez Miguel A.; Juarez Josue; Taboada Pablo;

  • 作者单位

    Univ Santiago de Compostela Dept Fis Particulas Grp Fis Coloides &

    Polimeros Santiago De Compostela 15782 Spain;

    Univ Santiago de Compostela Dept Fis Particulas Grp Fis Coloides &

    Polimeros Santiago De Compostela 15782 Spain;

    Univ Santiago de Compostela Dept Fis Particulas Grp Fis Coloides &

    Polimeros Santiago De Compostela 15782 Spain;

    Univ Santiago de Compostela Dept Fis Particulas Grp Fis Coloides &

    Polimeros Santiago De Compostela 15782 Spain;

    Univ Santiago de Compostela Dept Fis Particulas Grp Fis Coloides &

    Polimeros Santiago De Compostela 15782 Spain;

    Univ Santiago de Compostela Dept Fis Particulas Grp Fis Coloides &

    Polimeros Santiago De Compostela 15782 Spain;

    Univ Sonora Dept Fis Resales &

    Transversal Hermosillo 83000 Sonora Mexico;

    Univ Sonora Dept Fis Resales &

    Transversal Hermosillo 83000 Sonora Mexico;

    Univ Santiago de Compostela Dept Fis Particulas Grp Fis Coloides &

    Polimeros Santiago De Compostela 15782 Spain;

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  • 正文语种 eng
  • 中图分类 物理化学（理论化学）、化学物理学;
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