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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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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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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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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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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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可回收和可降解的离子替代长链聚钢.

Anne Saumer1, Stefan Mecking1

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

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概括
此摘要是机器生成的。

研究人员开发了可回收的植物油基聚合物,具有类似聚乙烯的特性. 这些含有离子的聚合物具有可调节的机械和表面特性,可以更轻松地打印和化学回收.

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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
  • 可持续的高分子.

背景情况:

  • 像聚乙烯这样的无极聚合物可以通过离子组获得理想的特性,例如粘附.
  • 目前的乙烯共聚合物由于其全碳骨架缺乏可降解性和化学可回收性.

研究的目的:

  • 从植物油中合成和特征化含有离子的长链聚.
  • 调查离子组和阴离子对抗体对聚合物特性的影响.
  • 评估这些新型聚合物的可降解性和化学可回收性.

主要方法:

  • 合成含有离子的长链聚烯,其离子含量低 (<0.5 mol %).
  • 结构和机械性能的表征,包括HDPE类似的行为.
  • 评价了对机械性能和融体质学的阴离子对电离子效应 (Mg2+,Ca2+,Zn2+).
  • 评估吸水,无生物降解,表面湿透性和可打印性.
  • 通过甲醇溶解证明化学物质的可回收性.

主要成果:

  • 从植物油中合成的聚合物表现出类似HDPE的结构和机械性能.
  • 阴离子对象对机械性能和融体质有显著影响.
  • 含有酸的聚体显示出水的吸收和非生物降解.
  • 增强的表面湿透性使打印更容易.
  • 甲醇化允许去聚合成整洁的长链单体,表明可回收.
  • 中和硫酸聚体表现出更好的表面性能和吸附能力.

结论:

  • 可调节,可回收的聚乙烯类聚合物可以从植物油中合成.
  • 加入离子组和仔细选择离子允许修改属性.
  • 这些材料提供了一个可持续的替代品,具有各种应用的潜力.