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相关概念视频

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.1K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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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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...
2.6K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.4K
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.
Many natural and synthetic polymers are produced by...
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用于塑造聚合甲酸分子重量分布的选择性去聚合

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此摘要是机器生成的。

可逆失活基聚合 (RDRP) 可实现受控的聚合物脱聚合. 这项研究表明,聚甲酸 (PBMA) 的选择性去聚合可以改变材料特性,甚至可以加密数据.

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科学领域:

  • 聚合物化学
  • 材料科学

背景情况:

  • 可逆失活基聚合 (RDRP) 允许进行受控的聚合物合成.
  • 链末反应提供了一种在较低温度下触发脱聚合的方法.

研究的目的:

  • 通过链末反应来研究聚甲酸 (PBMA) 的选择性脱聚合.
  • 证明PBMA混合物的分子重量分布 (MWD) 和粘弹性特性的能力.
  • 探索使用聚合物混合物的数据加密的潜力.

主要方法:

  • 通过热活性链末通过RDRP合成PBMA.
  • 选择性去聚合PBMA混合物具有不同的分子量.
  • 在去聚合之前和之后的MWD和粘弹性特性.

主要成果:

  • 选择性去聚合有效地扭曲了PBMA混合物的MWD.
  • 通过脱聚合实现了对粘性弹性特性的控制变化.
  • 一个概念验证通过在MWD变化中编码莫尔斯码来证明数据加密.

结论:

  • 链末再激活是可调的聚合物修饰的可行策略.
  • 这种方法可以通过改变材料特性来实现"破坏性强化".
  • 聚合物混合物可以作为信息存储媒介.