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相关概念视频

Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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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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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Updated: Apr 7, 2026

Micropunching Lithography for Generating Micro- and Submicron-patterns on Polymer Substrates
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在聚合物网络中数字可编程的微相分离产生微观结构模式.

Bohan Liu1, Zheqi Chen1, Junjie Zhao1

  • 1State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China.

ACS nano
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概括
此摘要是机器生成的。

研究人员开发了一种数字方法,用于创建各种高分子微结构,用于先进的应用. 这种技术使用可编程局部模块来控制微相分离,使得使用家用工具能够生成大面积的模式.

关键词:
打击假冒和伪造的行为.微观结构就是微观结构.多层次结构是多层次的结构.阶段分离的相位分离.软材料 软材料 软材料

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 纳米技术纳米技术

背景情况:

  • 聚合物的微观结构模式对于分离,光学和电子等应用至关重要.
  • 在大面积上创建具有可控形态和特征大小的多样化聚合物微结构是一个重大挑战.

研究的目的:

  • 设计一种材料系统,使得在聚合物网络中实现微相分离的数字编程.
  • 为了生成具有可控形态和特征大小的多样化微观结构模式.
  • 通过使用可访问技术来展示创建微结构聚合物的实用方法.

主要方法:

  • 设计了一个聚合物网络,允许数字编程局部模量.
  • 使用局部模量控制来阻止微相分离的长度尺度.
  • 使用墨水打印机和紫外线进行大面积 (≫100毫米) 图案编程,分辨率很好 (∼100微米).

主要成果:

  • 生成的聚合物微结构具有不同的形态 (双连续,海岛) 和特征大小 (∼100 nm到几微米).
  • 实现了微相分离的数字编程,用于微结构生成.
  • 在局部变化的微观结构中通过光散射变化展示可见的图案,以软防伪装置为例.

结论:

  • 在聚合物网络中微相分离的数字编程是一种多功能方法.
  • 该方法适用于各种聚合物,并允许创建功能设备.
  • 该技术为先进的聚合物微结构制造提供了一个可扩展的平台.