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相关概念视频

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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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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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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.
Many natural and synthetic polymers are produced by...
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Polymer Classification: Architecture01:14

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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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Polymer Classification: Stereospecificity01:26

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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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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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半芳香的聚乙烯具有可调节的降解配置文件.

Nicola G Judge1, Maddison I Segal2, Robert O Silzer1

  • 1Department of Chemistry, Duke University, Durham, North Carolina 27708, United States.

ACS macro letters
|October 28, 2024
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概括
此摘要是机器生成的。

这项研究引入了一种具有可调节降解速率的新型聚乙烯 (PCL) 共聚物. 半芳香聚乙烯 (SAEE) PCL共聚物为生物医学应用提供可调节的热和机械性能.

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科学领域:

  • 生物材料科学 生物材料科学
  • 聚合物化学 聚合物化学
  • 材料工程 材料工程 材料工程

背景情况:

  • 聚甲 (PCL) 是一种常见的生物医学聚合物.
  • PCL的缓慢降解限制了它的应用.
  • 需要进行PCL修改以控制降解速度.

研究的目的:

  • 开发一种具有修改的降解特征的聚乙烯 (PCL) kopo 聚合物.
  • 为了研究半芳香聚乙烯 (SAEE) 单体对PCL特性的影响.
  • 微调PCL的热,机械和降解特性.

主要方法:

  • 合成了一种半芳香的聚乙烯 (SAEE) PCL共聚物,使用基于酸的单体.
  • 描述共聚合物的热性能 (化和结晶温度).
  • 进行了机械分析 (斯模量,E) 和加速基本降解研究 (2M NaOH).

主要成果:

  • 加入SAEE破坏了PCL的半晶体性质,导致热过渡温度降低.
  • 同聚合物表现出降低的刚性和增加的伸展性,随着SAEE含量的增加.
  • 加速降解研究表明,SAEE-PCL共聚合物在纯PCL相比,质量损失明显更快.

结论:

  • 该SAEE-PCL共聚合物允许精确调整热,机械和降解性能.
  • 这种可调节的PCL共聚合物保持了有利的生物特征.
  • 开发的材料为需要受控降解的先进生物医学应用提供了潜力.