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相关概念视频

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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在序列定义的peptoid双块共聚合物中纳米级相分离.

Jing Sun1, Alexander A Teran, Xunxun Liao

  • 1Molecular Foundry, ‡Materials Sciences Division, ∥Environmental Energy Technologies Division, and #National Center for Electron Microscopy, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.

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概括

高纯度的类块共聚物揭示了对微相分离的新见解. 它们的形态学偏离了理论预测,突出显示了单体结构和低多分散度对材料行为的影响.

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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:

  • 块共聚合物对于纳米级光刻和储能等应用至关重要.
  • 目前关于区块共聚合物形态学的理论经常假设完美的单分散性,这与实验现实不同 (PDIs 1.01-1.10).

研究的目的:

  • 系统地研究化学结构和固态形态学之间的关系在peptoid diblock共聚物中.
  • 探索极低多聚分散度 (PDIs ≤1.00013) 对块共聚合物相位行为的影响.

主要方法:

  • 类似的类块共聚合物的固体相合成:聚-N2 - 2 - 2 - 2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  • 从0.11到0.65对Nte块体积分数 (φNte) 的控制变化,其固定链长为36个单体.
  • 实验确定秩序-混乱过渡温度和由此产生的形态.

主要成果:

  • 秩序-混乱过渡温度的最大值为 φNte = 0.24,这与理论预测的最大值为 φNte = 0.5.5 的理论预测相矛盾.
  • 在所有有序阶段观察到状形态,即使在低Nte体积分数 (φNte = 0.11).
  • 实验结果在质上与已建立的区块共聚物微相分离理论不一致.

结论:

  • 该研究表明,单体结构和异常低的多聚分散性显著影响块共聚合物相位行为.
  • 区块共聚物中微相分离的现有理论需要重新评估,以考虑这些因素.
  • 这项工作为了解和设计先进的块共聚合物材料开辟了新的途径.