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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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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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Plastic Behavior01:21

Plastic Behavior

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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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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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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探索超薄聚烯的分解强度降低和缓解的探索.

Daniel Q Tan1,2, Yichen Liu1, Xiaotian Lin1

  • 1Department of Materials Science and Engineering, Guangdong Technion-Israel Institute of Technology, 241 Daxue Road, Shantou 515063, China.

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概括
此摘要是机器生成的。

对于电容器来说,稀释聚烯薄膜会因为缺陷而削弱它们的介电强度. 原子层沉积 (ALD) 氧化物涂层增强薄双轴定向聚烯 (BOPP) 薄膜,改善功率电子的能量密度.

关键词:
破裂强度强度的破裂强度是什么电容器电容器的电容器电容器的电容器是什么拉伸式片可以拉伸.薄膜的厚度 薄膜的厚度一个聚合物聚合物.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电气工程 电气工程
  • 聚合物科学 聚合物科学

背景情况:

  • 聚烯薄膜是电容技术中的关键有机介电体.
  • 功率电子产品的小型化需要更薄的介电膜.
  • 商用双轴定向聚烯 (BOPP) 薄膜在厚度降低到5微米以下时失去分解强度.

研究的目的:

  • 为了研究1至5微米之间的聚烯薄膜的分解强度.
  • 为了确定薄BOPP薄膜中电介强度降低的原因.
  • 为了提高薄BOPP薄膜的介电强度和高温性能.

主要方法:

  • 在1-5微米厚度范围内制造和测试聚烯薄膜.
  • 使用差分扫描热量计 (DSC),X射线和扫描电子显微镜 (SEM) 进行分析.
  • 在BOPP薄膜上应用原子层沉积 (ALD) 氧化物涂层.

主要成果:

  • 薄膜薄于5微米的分解强度迅速下降,阻碍了能量密度目标.
  • 不均的纤维和空隙等缺陷,而不是晶体学特性,导致薄膜的过早分解.
  • ALD氧化物涂层成功地增加了BOPP薄膜的介电强度在5微米以下,而不会降解物理性能.

结论:

  • 在BOPP薄膜生产过程中过度拉伸会引入缺陷,限制在小厚度的介电性能.
  • ALD氧化物涂层是一种有效的策略,可以克服薄BOPP薄膜中介电强度的降低.
  • 这种增强对于在功率电子的小型电容器中保持高能量密度至关重要.