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Radical Chain-Growth Polymerization: Overview01:10

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Radical Chain-Growth Polymerization: Mechanism01:09

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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通过激进聚合来定制坚固的2D纳米通道,以实现高效的分子选.

Yue You1, Yuxi Ma2, Xianghui Zeng3

  • 1Institute for Frontier Materials, Deakin University, Geelong, Victoria, 3220, Australia.

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概括

研究人员开发了强大的,可调节的氧化石墨烯 (GO) 膜,用于分子选. 这一突破提高了高级应用的分离性能和机械耐用性.

关键词:
2D膜是二维的膜.高水透率的高水透率是什么极端聚合基的多聚化强大的纳米通道.水的净化水的净化方法

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 二维 (2D) 纳米通道提供精确的分子或离子选,由于通道尺寸均和可调节性质.
  • 2D纳米通道技术的关键挑战包括控制通道尺寸和保持高机械完整性.

研究的目的:

  • 开发一个一般的策略来定制氧化石墨烯 (GO) 膜的d间距.
  • 为了提高GO膜的机械强度,同时实现可控制的纳米通道尺寸.
  • 为了评估改性GO膜在分子选应用中的性能.

主要方法:

  • 使用N-Vinylformamide的激素诱导聚合策略被用于修改氧化石墨烯 (GO) 膜.
  • 板间画廊的d间距通过这种聚合过程可控地调整.
  • 机械强度,水透度和溶液选择性在各种条件下进行了表征.

主要成果:

  • 经过修改的GO膜具有高达105MPa的超高拉伸强度.
  • 从0.799nm成功调整到1.410nm的d间距.
  • 水的透率高达218 L m−2 h−1 bar−1,比原始GO膜增加了1304%,在200小时内表现稳定.
  • 在恶劣条件下 (pH 4.0-10.0,12 bar压力,40 °C) 保持了高溶解物选择性.

结论:

  • 激素诱导的聚合策略有效地平衡了GO膜的选性能和机械强度.
  • 这些定制膜代表了下一代分子选应用的重大进步.
  • 开发的方法为创建强大和高性能2D纳米通道材料提供了一种多功能方法.