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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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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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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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闭环可循环回收的聚合物材料通过动态转乙烯化

Pawan Kumar1, Yashi Agarwal1, Soumabrata Majumdar2

  • 1Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, 208016, India. ramkrishna@iitk.ac.in.

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概括
此摘要是机器生成的。

这项研究证明了乙烯基聚合物的闭环可回收性. 回收的单体重新合成具有原始性质的聚合物,并通过调整交联间距来调整动态特征.

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科学领域:

  • 聚合物化学
  • 材料科学
  • 可持续的聚合物

背景情况:

  • 交联聚合物在回收和性能修改方面经常面临挑战.
  • 乙烯链接为动态聚合物网络提供了潜力.

研究的目的:

  • 研究基于乙烯的交联聚合物的闭环可循环.
  • 探索这些聚合物的动态特性.
  • 为了证明单体的恢复和再合成.

主要方法:

  • 用过化进行聚合物降解.
  • 通过化学过程回收的单体.
  • 从回收的单体中重新合成的聚合物.
  • 系统地改变交叉连接距离以研究属性变化.

主要成果:

  • 通过转乙烯化实现聚合物的完全降解性.
  • 在高产量的回收单体.
  • 重新合成的聚合物表现出原始材料的特性.
  • 通过改变交叉连接距离,对应力放松有显著影响.

结论:

  • 对于乙烯基聚合物来说,已确定闭环可回收性.
  • 通过结构修改来调整动态特性, 特别是应力放松的能力.
  • 突出了可持续聚合物设计和应用的潜力.