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相关概念视频

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and 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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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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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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Polymer Classification: Architecture01:14

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

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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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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生物可再生和圆形的多烯热塑性弹性体.

Ye Sha1, Xiaofan Chen2, Wei Sun2,3

  • 1Department of Chemistry and Material Science, College of Science, Nanjing Forestry University, Nanjing, 210037, China. shaye@njfu.edu.cn.

Nature communications
|October 1, 2024
PubMed
概括

这项研究介绍了一种新的,化学可回收的,来自生物质的热塑性弹性体平台. 创新的设计使高效的脱聚合成为可能,并解决了聚合物材料的可持续性挑战.

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科学领域:

  • 聚合物化学 聚合物化学
  • 材料科学 材料科学 材料科学
  • 可持续化学 可持续化学

背景情况:

  • 解决聚合物可持续性至关重要,热塑性弹性体 (TPE) 的化学回收是由于其复杂的多元组件性质而面临的重大挑战.
  • 目前塑料循环的进展还没有完全解决TPE的可回收性.
  • 为高性能聚合物开发可持续的替代品至关重要.

研究的目的:

  • 为化学可回收和坚固的热塑性弹性体创建基于同聚合物的平台.
  • 设计一种半结晶聚合物,具有受控的分子量和结晶性,以提高可回收性.
  • 为单体合成利用完全基于生物的循环烯酸,促进原料的可再生性.

主要方法:

  • 生物基循环烯酸的环开放元解聚合 (ROMP) 合成半晶聚合物.
  • 控制环链平衡的操纵,以在聚合和脱聚合过程中实现高转换.
  • 由此产生的热塑性弹性体的性能和可回收性特征.

主要成果:

  • 一种高分子量,低晶度的半晶体聚合物成功合成.
  • 对于前向聚合和反向脱聚合,都实现了定量转换,证明了有效的化学回收利用.
  • 开发的平台从可再生资源中产生了坚固,高性能的热塑性弹性体.

结论:

  • 已经建立了一个基于生物质的简单,圆形,高性能热塑性弹性体平台.
  • 单体设计对于实现原料可再生性,脱聚合选择性和克服可持续聚合物的性能权衡至关重要.
  • 这项工作为热塑性弹性体的可持续生产和回收提供了一个有希望的解决方案.