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相关概念视频

Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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10nm以下的结构是由一个棒-线圈块共聚合物构建的.

Shichu Yang1, Yixuan Yang1, Qiangwei Zhan1

  • 1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, China.

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概括

高χ块共聚合物 (BCP) 使得更小的纳米结构成为可能. 研究人员合成了聚二甲基西洛-块-聚合物[4].

关键词:
高-χχ 的情况.棒-线圈 块 聚合物共聚合物自动组装的自动组装机在10nm以下的10nm.

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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
  • 纳米技术 纳米技术

背景情况:

  • 块共聚合物 (BCP) 自组装成纳米结构 (20-100 nm).
  • 实现较小的纳米结构需要高的Flory-Huggins参数 (χ) BCPs.
  • 棒卷BCP在理论上在xN>5时分离微相,使得具有低聚合度的小结构成为可能.

研究的目的:

  • 合成和描述10nm以下纳米结构的新型高χBCP.
  • 研究聚二甲基西洛-块-聚[4'-(甲基) -2-乙烯基双-4-甲基乙烯] (PDMS-b-PMVBP) 的自组装行为.
  • 确定顺序-混乱过渡温度 (TODT) 和相互作用参数 (χ).

主要方法:

  • 合成PDMS-b-PMVBP块共聚物的合成.
  • 小角度X射线散射 (SAXS) 用于批量结构的表征.
  • 取决于温度的SAXS来确定TODT.

主要成果:

  • PDMS-b-PMVBP可以自组装成板状 (LAM),双连续和六角包装圆柱体 (HEX) 阶段.
  • 实现了LAM结构,其最小周期大小为9.34nm.
  • 在25°C的相互作用参数 (χ) 被计算为0.632,表明强分离.

结论:

  • 高χ杆线圈BCP在创建10nm以下纳米结构方面是有效的.
  • PDMS-b-PMVBP展示了多功能自组装的能力.
  • 高的 χ 值证实了强大的块共聚合物相互作用,这对于纳米级订单至关重要.