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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 polymer...
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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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Polymers02:34

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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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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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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聚碳酸盐的脱聚合和再利用:新兴的类别,机制和挑战

Davide Rigo1, David H Lamparelli2, Antonio Buonerba2

  • 1Institute of Chemical Research of Catalonia (ICIQ-Cerca), the Barcelona Institute of Science & Technology (BIST), Tarragona, Spain.

Angewandte Chemie (International ed. in English)
|March 11, 2026
PubMed
概括

本综述探讨了可设计回收的聚合物,重点是聚碳酸 (PC). 它强调了可控降解机制和高效的脱聚合方法,以实现可持续的PC开发和回收利用.

关键词:
圆形的聚合物是一种圆形的聚合物.脱聚合脱聚合的过程这些机制的机制.聚碳酸盐是一种聚碳酸盐.回收回收是回收的方法.

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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
  • 可持续化学 可持续化学

背景情况:

  • 塑料和聚合物的有效回收对于循环化学至关重要.
  • 工程聚合物如聚碳酸 (PC) 在消费品中至关重要.
  • 个人电脑的可持续生产和寿命终止管理是迫切需要关注的问题.

研究的目的:

  • 审查指导未来聚碳酸 (PC) 开发的关键方面.
  • 了解PC中的受控降解机制.
  • 为了确定PC回收的高效脱聚合方法.

主要方法:

  • 关于PC回收和降解的文献综述.
  • 对受控降解的机械理解的分析.
  • 对PC的脱聚合策略的讨论.

主要成果:

  • 对受控降解的机制理解对于PC开发至关重要.
  • 高效的脱聚合方法是PC回收的关键成果.
  • 新兴的聚碳酸盐类别,包括含有异原子的类型,显示出希望.

结论:

  • 未来的PC开发应该优先考虑受控降解和高效的脱聚合.
  • 设计时可回收的聚合物,特别是PC,对于循环经济至关重要.
  • 对新型PC结构的进一步研究,如含有异原子的聚碳酸盐,是有必要的.