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相关概念视频

Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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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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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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相关实验视频

Updated: Sep 9, 2025

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可回收基因触发的"按需结合"的形聚氨粘合剂:用于喷墨配方的工程粘合剂

Matthew J Hyder1, Jessica Godleman2, Andrew Kyriacou2

  • 1Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, U.K.

ACS applied engineering materials
|August 28, 2025
PubMed
概括

新的聚氨具有强大的粘附性,并可在需求时使用基溶液进行快速解. 这些可回收粘合剂在工业应用中增强了基板的循环性和可持续性.

关键词:
粘合剂长链聚氨需要的债券脱聚变喷墨印刷回收使用

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科学领域:

  • 聚合物化学
  • 材料科学
  • 可持续工程

背景情况:

  • 强大的聚合物粘合剂至关重要,但阻碍了基板回收.
  • 现有的按需解粘合剂往往会损害解效率的强度.
  • 需要高性能与可回收性平衡的粘合剂.

研究的目的:

  • 开发具有高强度和快速的基因诱导解的可定制聚合物粘合剂.
  • 设计粘合剂以提高基板可回收性和材料循环性.
  • 用这些新型粘合剂制造可打印的墨水.

主要方法:

  • 在聚氨合成中加入可降解延长剂.
  • 链延长型聚氨 (CEPU) 的粘合强度和脱聚变动力学的特征.
  • 将CEPU制成连续喷墨 (CIJ) 印刷油墨.
  • 评估CEPU的解效率和可回收性.

主要成果:

  • CEPU具有很高的剪切强度 (8.20 MPa).
  • 基处理导致了快速脱聚合 (Mn损失高达88%) 和显著的强度降低 (30分钟内高达92%).
  • 在基处理后,CIJ打印的图像有效地从基板上移除.
  • 回收的CEPU保留了其可脱聚合和按需脱的特性.

结论:

  • 可降解链延长型聚氨提供可调节的粘合强度和可拆解性平衡.
  • 这种系统为提高材料可回收性和可持续性提供了可行的工业途径.
  • 开发的粘合剂适用于可打印应用,使循环经济原则成为可能.