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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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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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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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Step-Growth Polymerization: Overview01:03

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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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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Radical Chain-Growth Polymerization: Chain Branching01:17

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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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通过四重结合侧链物理交联的多烯酸盐.

Jente Verjans1, Alexis André2,3, Tomáš Sedlačík1

  • 1Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, B-9000 Ghent, Belgium. Richard.Hoogenboom@ugent.be.

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概括
此摘要是机器生成的。

研究人员开发了使用ureaidopyrimidinone (UPy) 侧链增强性能的动态聚合物材料. 这些功能化聚甲基烯酸盐 (PMA) 和聚n-丁烯酸盐 (PBA) 聚合物通过超分子相互作用表现出可调节的机械特性.

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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
  • 超分子化学 超分子化学

背景情况:

  • 动态聚合物材料利用超分子相互作用来获得可调节的特性.
  • 尿胺 (UPy) 是在聚合物中创建可逆键的关键动机.
  • 优化UPy结构,比如使用分支基链,可以提高溶解度并防止聚合.

研究的目的:

  • 为了合成和表征聚甲基烯酸盐 (PMA) 和聚甲基烯酸盐 (PBA),用一种新的UPy图案功能化.
  • 研究这些超分子聚合物材料的机械性能和网络动态.
  • 探索UPy侧链对聚合物行为和材料性能的影响.

主要方法:

  • 通过Cu(0) 介导的基聚聚合,合成低摩尔质量的PMA和PBA.
  • 通过转化引入基函数组以进行随后的UPy附着.
  • 紫外线启动的基质乙烯合用于UPy侧链功能化.
  • 使用热分析 (TGA,DSC),动态机械热分析 (DMTA),拉力测试和风湿学分析进行表征.

主要成果:

  • 成功合成了具有可调节性质的UPy功能化的PMA和PBA.
  • PMA-UPy材料呈现出玻璃性质,而PBA-UPy则形成状网络,这与它们的玻璃过渡温度有关.
  • 机械特性和网络动态被成功评估,揭示了超分子UPy相互作用的影响.
  • 修改后的粘性Rouse模型表明,UPy单元没有显著的聚合或相位分离.

结论:

  • 该研究成功地用UPy侧链制备了新的动态聚合物材料.
  • 在UPy中的分支基链增强了兼容性和可溶性.
  • 由此产生的结聚合物网络表现出可调整的机械性能和可预测的网络动态.
  • 这些发现为设计先进的功能性聚合物材料提供了途径.