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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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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...
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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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相关实验视频

Updated: Jun 17, 2025

Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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热速敏感的聚乙烯二甲甲.

Robert David Ludwig Jerusalem1, Michail Maricanov1, Thomas Raidt1

  • 1Department of Biochemical and Chemical Engineering, Biomaterials & Polymer Science, TU Dortmund University, 44221, Dortmund, Germany.

Macromolecular rapid communications
|August 13, 2024
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种新的智能材料,交联聚乙烯二甲 (x-PET),根据加热速度改变长度. 这种材料可以感知和响应动态温度变化,用于先进的应用.

关键词:
相互连接的PET.结晶化 结晶化的过程.预测材料是一种预测材料.形状记忆 形状记忆 形状记忆

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物科学 聚合物科学
  • 智能材料是一种智能材料.

背景情况:

  • 智能材料对外部触发器做出反应,未来的世代可以感知触发器的动态.
  • 目前动态敏感材料的数量有限,多态交叉连接的合成性聚烯是唯一的例子.

研究的目的:

  • 引入一种基于交联聚乙烯二甲酸 (x-PET) 的新型加热率敏感智能材料.
  • 为了证明x-PET识别和对外部热触发器的动态反应的能力.

主要方法:

  • 准备了交叉连接的,完全无形的可灭的半晶体聚乙烯二甲酸盐 (x-PET).
  • x-PET被拉伸到化温度以上,被约束,然后灭到无形状态.
  • 该材料在120-170°C之间以各种速度加热,并分析其收缩.

主要成果:

  • x-PET表现出加热速度的灵敏度,根据应用的加热速度缩小到不同的长度.
  • 材料的收缩开始于其玻璃过渡温度 (Tg) 以上,并被结晶所阻止.
  • 控制的收缩允许读取加热速率和机械过程切换.

结论:

  • 使用x-PET展示了对加热速度敏感的智能材料的新原理.
  • 由于x-PET的动态反应,它可以在传感和机械驱动方面进行新型应用.
  • 收缩和结晶之间的相互作用决定了材料对加热速率的独特敏感性.