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相关概念视频

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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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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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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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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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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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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聚乙烯的批量去聚合,使用共诺米基激素触发剂.

James B Young1, Jared I Bowman1, Megan E Lott1

  • 1George & Josephine Butler Polymer Research Laboratory, Department of Chemistry, Center for Macromolecular Science &Engineering, University of Florida, Gainesville, Florida 32611, United States.

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概括
此摘要是机器生成的。

这项研究提出了一种新的方法,用于使用特殊的共纳体去聚合聚烯,减少温度和时间. 这种无溶剂的工艺有效地将聚合物转化为可回收的单体,推进可持续的塑料解决方案.

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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:

  • 传统的聚乙烯回收通常需要高温和恶劣的条件.
  • 开发高效的低温脱聚合方法对于可持续的聚合物管理至关重要.
  • 现有的聚钢脱聚合方法在效率和适用性方面存在局限性.

研究的目的:

  • 在降低温度下引入一种新的无溶剂方法来使聚乙烯脱聚合.
  • 为了利用热不稳定的共纳体,N- ((methacryloxy) phthalimide (PhthMA),以实现高效的聚合物骨干裂解.
  • 为了证明脱聚合产品的单体回收和再聚合能力.

主要方法:

  • 在聚烯链中将N- ((methacryloxy) phthalimide (PhthMA) 作为共称体的结合.
  • 热处理以触发脱碳化和随后的骨干基生成.
  • 对脱聚合效率,动力学和单体回收的分析.

主要成果:

  • 聚乙烯类型在不到2小时内脱聚合,回归到91%的单体.
  • 与传统聚钢相比,脱聚合发生在明显较低的温度下.
  • 使用PhthMA的悬浮组方法比终端链触发方法更有效.
  • 恢复的烯单体被成功重新聚合成新的烯材料.

结论:

  • 新的共同分子策略使高效,低温,无溶剂的聚乙烯脱聚合成为可能.
  • 这种方法通过单体回收和再利用为聚钢回收提供了一个可持续的途径.
  • 该方法广泛适用于各种 styrenic 共聚合物和潜在的其他乙烯基聚合物类别.