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相关概念视频

Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.
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Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Plasticizers

Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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热塑性网络形成作为稳定盐水合物颗粒的方法

Elena Averina1,2, Hartmut Fischer3, Olaf C G Adan1,3

  • 1Department of Applied Physics and Science Education, Eindhoven University of Technology, Den Dolech 2, 5600 MB Eindhoven, The Netherlands.

Molecules (Basel, Switzerland)
|December 11, 2025
PubMed
概括

这项研究通过结合聚合物网络来增强热化学储能 (TCES) 材料. 这可以防止颗粒的降解,提高TCES系统的效率和寿命.

关键词:
复合材料 复合材料 是一种复合材料.盐水合物 盐水合物稳定 稳定 稳定 稳定热化学储能是热化学的储能方式.热塑性聚合物中的热塑性聚合物.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 热化学储能 (TCES) 提供了高效的热能管理.
  • 在水化-脱水周期期间TCES材料的机械降解会导致粒子破裂和压力下降.
  • 这限制了TCES系统的实际应用.

研究的目的:

  • 研究聚合物网络的使用,以提高TCES粒子的机械稳定性.
  • 为了提高TCES材料的耐用性和性能,用于重复循环.

主要方法:

  • 使用碳酸水合物 (K2CO3·1.5H2O) 作为核心材料开发了复合颗粒.
  • 热塑性聚合物包括聚胺 (PA11),聚胺 (PEI) 和聚乙烯化物 (PVDF) 被用作稳定元件.
  • 评估了复合粒子的机械性能和循环稳定性.

主要成果:

  • 纳入聚合物网络显著改善了TCES粒子的机械完整性.
  • 复合材料颗粒在多个水化-脱水循环中表现出对分解的抗性.
  • 在保持相对较高的多孔度的同时,实现了增强的机械稳定性,从而提高了水合率.

结论:

  • 聚合物稳定TCES颗粒为机械降解问题提供了可行的解决方案.
  • 这种方法提高了热化学储能系统的长期性能和可靠性.
  • 稳定方法与可扩展的制造技术 (如平板和压缩) 兼容.