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Polymers02:34

Polymers

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Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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

Cationic Chain-Growth Polymerization: Mechanism

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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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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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Regioselective Formation of Enolates01:33

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As depicted in the figure below, the unsymmetrical ketones can form two possible enolates:  less substituted or more substituted enolates. Usually, the thermodynamic enolates are formed from the more substituted α-carbon atom, while the kinetic enolates are formed faster by deprotonation from the less substituted position. The thermodynamic enolates have lower energy, so they are  more stable. But the energy required to form kinetic enolates is less.
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使用新的基于有机聚合物的柔性坐标核心外,具有高效的CO2/N2选择性

Soheila Sharafinia1, Nedasadat Saadati Ardestani2, Alimorad Rashidi2

  • 1Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz 613578-3151 Ahvaz Iran sharafi.s2014@gmail.com.

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概括

与金属有机框架 (MOF) 结合的协调有机聚合物 (COP) 增强了二氧化碳的吸附和分离. 这种新的方法显著提高了碳捕获能力和可持续气体管理的选择性.

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科学领域:

  • 材料科学
  • 化学学
  • 环境科学

背景情况:

  • 协调有机聚合物 (COP) 和金属有机框架 (MOF) 是用于气体吸附的多孔材料.
  • 结合COP和MOF在吸附性能,稳定性和气体分离的选择性方面具有协同优势.
  • 现有材料在碳捕获应用方面面临效率和成本效益的限制.

研究的目的:

  • 调查COP和MOF的联合使用,以提高CO2和N2的吸附和分离.
  • 为气体吸附应用合成和描述COP@ZIF-8的新型核心外结构.
  • 评估这些新材料对CO2/N2混合物的吸附能力和选择性.

主要方法:

  • 使用Solvothermal合成创建COP和COP@ZIF-8核心纳米结构.
  • 使用包括FT-IR,XRD,BET,TEM,SEM,TGA和XPS在内的技术进行全面的表征.
  • 在各种条件下进行气体吸附和分离实验以评估CO2/N2混合物的性能.

主要成果:

  • 在COP@ZIF-8核心外结构中,二氧化碳吸附能力显著增加,从0.209升至3.425mmolg-1在1bar和300.15K.
  • 对CO2/N2的吸附选择性大大提高;COP@ZIF-8 (20%和30%) 的选择性分别为207.752和200.592,而纯COP的选择性为14.824.
  • COP和ZIF-8的协同作用有效地增强了气体吸附和分离特性.

结论:

  • 开发的COP@ZIF-8核心纳米结构代表了吸附剂技术的高效和成本效益的进步.
  • 这种混合材料方法克服了单个组件的局限性,为二氧化碳捕获和分离提供了更好的性能.
  • 这些发现为环境应用设计可持续的高性能多孔材料开辟了新的途径.