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相关概念视频

Types of Step-Growth Polymers: Polyesters01:20

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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.
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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.
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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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概括

可持续的聚合物至关重要. 这项研究从PETG开发了可治愈和可再加工的乙烯基基尿 (VU) 网络,证明了出色的机械性能和高效的自我修复能力,以延长材料寿命.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 可持续材料 可持续材料

背景情况:

  • 对可持续材料的日益增长的需求需要延长聚合物生命周期.
  • 传统的聚合物往往缺乏可再加工性和自我修复性,导致浪费.
  • 聚乙烯二甲酸甘醇 (PETG) 是一种广泛使用的高性能聚.

研究的目的:

  • 从PETG开发新的可治愈和可再加工的聚合物网络.
  • 为了研究乙烯基体尿 (VU) 网络的合成和特性.
  • 为了提高商业聚的可持续性和寿命.

主要方法:

  • 通过以乙烯糖醇对PETG进行Zn催化转合成的VU网络.
  • 终端功能化带有 bis-acetoacetate 的遥感器.
  • 使用tris-(2-aminoethyl) -amine (TREN) 形成的VU网络.

主要成果:

  • 实现了高抗拉强度 (高达48MPa),刚度 (0.9GPa) 和柔性 (破裂时长度为7%).
  • 在多个循环中以最小的性能损失证明了高效的再加工.
  • 呈现出快速有效的愈合,在180°C下在15分钟内恢复95%的原始强度.

结论:

  • 成功地将PETG转化为可再加工和可治愈的材料.
  • 开发的VU网络提供了一个可持续的替代方案,可以延长材料的寿命.
  • 介绍了一种可扩展的方法,用于创建先进的功能性聚合物.