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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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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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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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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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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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相关实验视频

Updated: May 23, 2025

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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带有废料可采用的多个链长度构建块的阿里法-芳香共聚合物.

Dario Rothauer1, Stefan Mecking1, Taylor F Nelson1

  • 1Department of Chemistry, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany.

ACS sustainable chemistry & engineering
|March 7, 2025
PubMed
概括
此摘要是机器生成的。

这项研究从塑料废料中合成了新型的异形芳香共聚合物,创造了具有与商业塑料相似的性能的可持续材料. 这种方法减少了对塑料生产的化石燃料的依赖.

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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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科学领域:

  • 聚合物化学 聚合物化学
  • 可持续材料科学科学 可持续材料科学
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 对于原始塑料生产的化石燃料的依赖,需要可持续的替代方案.
  • 塑料废物和生物资源为聚合物合成提供了可行的原料.
  • 来自聚乙烯 (PE) 废弃物的阿利法性聚合物表现有前途,但需要性能增强.

研究的目的:

  • 开发使用从PE废物中提取的二氧化酸的高性能异形芳香共聚合物.
  • 为了研究这些新型共聚合物的结构-属性关系.
  • 为了证明可扩展的合成和可处理性,用于潜在的商业应用.

主要方法:

  • 合成含有多链长度二碳酸 (C4-C20) 和二甲酸的阿里法-芳香共聚合物.
  • 热特性,固态结构和机械性能的表征.
  • 合成的升级和可处理性的评估.
  • 通过催化转化对废弃聚的后修改的探索.

主要成果:

  • 合聚的特性主要取决于亚利法和芳香单体的比率.
  • 合成的共聚合物表现出与商业聚乙烯基酸盐-共甲相比的机械和热性能.
  • 对于多链长度共聚的可扩展合成和良好的可加工性得到了证明.
  • 实现了聚的成功后修改,包括后消费聚乙烯四甲酸盐.

结论:

  • 来自塑料废物的阿利法-芳香共聚合物为高性能聚合物提供了一条可持续的途径.
  • 单体比率是定制材料特性的关键,使多功能应用成为可能.
  • 这项研究为将塑料废物再循环转化为有价值的材料铺平了道路,减少了对环境的影响.