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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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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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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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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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Polymer Classification: Stereospecificity01:26

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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闭环可回收聚二硫化为工程塑料的潜在替代品.

Meng Chen1, Rulin Yang1, Huiping Wu1

  • 1East China University of Science and Technology, Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, 130 Meilong Road, Shanghai, 200237, China.

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概括

本研究介绍了用于可持续工程塑料的硬性 Ester 图案的双聚合物网络. 这些材料提供了简单的闭环循环回收,解决了塑料废弃物的挑战.

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可以,可以.基于生物的生物基础.封闭循环回收的循环回收.工程塑料的工程塑料.聚二硫化 (PDD) 是一种聚二硫化.

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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
  • 可持续材料 可持续材料

背景情况:

  • 塑料的线性产品经济阻碍了可持续性.
  • 联适应性网络 (CAN) 通过将热性质与热塑性塑料可回收性相结合,为循环性提供了一条道路.
  • 开发可回收替代传统工程塑料的可回收替代品至关重要.

研究的目的:

  • 创建新型的双聚合物网络,将刚性埃斯特基因纳入动态聚二硫化物中.
  • 研究这些新材料的机械性能和化学抗性.
  • 为了证明这些聚合物闭环回收的可行性.

主要方法:

  • 通过将刚性基组集成到动态的聚二硫化物脊柱中,合成双聚合物网络.
  • 机械性能的表征,包括拉伸强度和弹性.
  • 对各种溶剂的化学耐药性的评估.
  • 通过轻度溶解来证明闭环循环回收.

主要成果:

  • 双聚合物网络表现出由于软/刚细分和可逆交联的相互作用而具有可调整的机械性能.
  • 这些材料表现出对一系列化学物质的良好抗性.
  • 通过温和溶解实现了成功的闭环回收,而回收材料保留了其机械完整性.
  • 开发的聚合物显示出有希望的可持续替代难以回收的工程塑料.

结论:

  • 双聚合物网络在动态聚硫化物中具有刚性基基因,为可持续塑料提供了可行的途径.
  • 这些材料具有理想的机械性能和耐化学性,适合工程应用.
  • 通过温和溶解来证明的闭环回收利用为塑料循环提供了切实可行的解决方案,减少了对环境的影响.