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相关概念视频

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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Separation of Sister Chromatids02:17

Separation of Sister Chromatids

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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
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Separable Differential Equations01:20

Separable Differential Equations

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A separable differential equation is a type of first-order differential equation where the derivative dy/dx can be expressed as a product of two functions: one that depends only on x and another that depends only on y. This allows for the rearrangement of the equation so that all terms involving y are on one side, and all terms involving x are on the other. This process, known as the separation of variables, simplifies the process of solving the equation by enabling the integration of both...
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Optimizing Chromatographic Separations01:15

Optimizing Chromatographic Separations

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Optimizing chromatographic separations is crucial for obtaining clean separations in a minimum amount of time. Optimization is required for several factors, including kinetic effects related to band broadening, plate height, capacity factor, and separation factor.
Band broadening refers to spreading solute bands as they travel through the column. This broadening can impact resolution. Plate height (H) represents the length required for one theoretical plate. A lower plate height corresponds to...
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Overview Of Cell Separation And Isolation01:20

Overview Of Cell Separation And Isolation

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Cell separation was first achieved in 1964 by S. H. Seal, who separated large tumor cells from the smaller blood cells using filtration. Two years later, Pohl and Hawk performed experiments on how cells respond differently to a nonuniform electric field based on the cell type. Such observations were the inception of cell separation methods, which allow isolating a single cell type from a heterogeneous sample.
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相关实验视频

Updated: Feb 10, 2026

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
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在半化双块共聚物中探索微相分离:一个联合的实验和建模调查.

Mona Semsarilar1, Martin J Greenall2, Alex H Balzer3,4

  • 1Institut Européen des Membranes (IEM), CNRS, ENSCM, Univ Montpellier, Montpellier 34090, France.

ACS polymers Au
|February 9, 2026
PubMed
概括

这项研究探讨了聚乙烯-块-聚 ((pentafluorostyrene) 双块共聚合物,揭示了由块长度驱动的从线圈-线圈到杆线圈行为的过渡,而不仅仅是化学差异. 这突显了类似的聚合物块中强烈的自我组装.

关键词:
在X射线反射测量中,用X射线进行反射测量.在X射线中散射.区块共聚合物 区块共聚合物自动组装的自动组装机强大的隔离理论.

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
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科学领域:

  • 聚合物科学 聚合物科学
  • 材料科学 材料科学 材料科学
  • 超分子化学 超分子化学

背景情况:

  • 块共聚合物自组装成纳米尺度形态,对于先进材料至关重要.
  • 聚烯-块-聚烯 (pentafluorostyrene) 提供了一个模型系统,用于研究由于区块之间的高度对抗性,自组装.
  • 了解块长度和固有的链条刚度对自组装的影响是关键.

研究的目的:

  • 为了研究聚钢-块-聚 ((pentafluorostyrene) 双块共聚合物的散装自组装行为.
  • 探索从线圈-线圈到杆-线圈分离行为的过渡.
  • 构建一个实验阶段图和验证理论模型.

主要方法:

  • 通过可逆添加-碎片化链转移 (RAFT) 聚合,合成了41个双块共聚合物样本.
  • 分子重量分布和分散的表征 (D).
  • 在热后通过小角度X射线散射 (SAXS) 和传输电子显微镜 (TEM) 分析纳米尺度形态.

主要成果:

  • 观察到精确定义的纳米尺度形态,取决于分子组成.
  • 构建了一个实验相位图,估计Flory-Huggins相互作用参数 (χ) 为0.2.2.
  • 通过减少更硬的化块的长度,而不改变温度或化学成分,观察到从线圈-线圈到杆线圈行为的过渡.

结论:

  • 这项研究表明,AB双块共聚物中具有相对相似的化学单元的强微相分离.
  • 通过调整块长度,可以实现从杆线圈到线圈-线圈分离行为的过渡.
  • 这项工作提供了通过操纵块刚度和长度来控制自组装的见解.