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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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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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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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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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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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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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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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相关实验视频

Updated: Jun 8, 2025

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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化聚乙烯四甲酸变成可降解的聚合物.

Zhenbo Guo1, Haoran Zhang2, Haoyu Chen1

  • 1Beijing National Laboratory for Molecular Sciences, New Cornerstone Science Laboratory, College of Chemistry and Molecular Engineering, Peking University, Beijing, China.

Angewandte Chemie (International ed. in English)
|November 4, 2024
PubMed
概括

本研究介绍了一种简单的方法,将废弃的聚乙烯二甲 (PET) 转化为可生物降解的聚,PET-PECHD. 这种上循环塑料提供了与提高可降解性的可比强度,为塑料废物提供了可持续的解决方案.

关键词:
在这里,PET是PET.这就是PET-PECHD.可降解聚的可降解聚.化化化的方法

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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
  • 环境科学 环境科学

背景情况:

  • 聚乙烯二甲 (PET) 是一种全球普遍存在的,不可降解的塑料废物.
  • 迫切需要有效的PET废物管理策略.
  • 将使用寿命结束的PET转化为可生物降解材料提供了一个有希望的解决方案.

研究的目的:

  • 开发一种简单的工艺,将废弃PET转化为可降解的聚.
  • 为了研究由此产生的共聚物,PET-PECHD的特性.
  • 评估大规模,具有成本效益的生产潜力.

主要方法:

  • 部分化PET的芳香环,以创建异质结构.
  • 控制由此产生的聚乙烯二甲酸-聚乙烯-1,4-环二碳酸盐 (PET-PECHD) 共聚物的组成.
  • 分析分子量,热稳定性,机械强度和生物降解性.

主要成果:

  • 实现了可变的PET-PECHD组合 (x/y从100/0到0/100).
  • 保持PET-PECHD的分子量,x/y>87/13.
  • PET-PECHD的热力/机械性能与PET相似,具有更好的伸展性,屏障性能和生物降解性.

结论:

  • 证明了一种成本效益高的方法,将PET废物再循环转化为可降解的聚.
  • PET-PECHD为传统PET提供了可行的替代品,并带来了更好的环境效益.
  • 这种方法对可持续的塑料废物管理具有重大潜力.