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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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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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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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Free Jet01:14

Free Jet

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Free jets describe the flow of liquid exiting a reservoir through an opening into the atmosphere without resistance. The velocity (v) of the liquid jet is derived using Bernoulli's principle and expressed as:
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Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications
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通过减少阻力聚合物和增强效率定义,优化喷气效率.

Abdelsalam AlSarkhi1, Abdulelah Kassar2, Qasim Sahu3

  • 1Department of Mechanical Engineering and Center for Integrative Petroleum Research, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia. alsarkhi@kfupm.edu.sa.

Scientific reports
|February 15, 2024
PubMed
概括
此摘要是机器生成的。

在液体喷气中添加阻力降低聚合物 (DRPs) 显著提高了它们的效率. 这种方法可以减少流体引进过程中的能量损失,提高的整体性能和工业应用中的经济可行性.

关键词:
空气提升的气.减少拖拉力的聚合物.效率 效率是指效率是指效率.喷射器是用于喷射器.喷气式喷气式

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科学领域:

  • 流体动力学 流体动力学
  • 化学工程是化学工程的重要组成部分.
  • 机械工程 机械工程

背景情况:

  • 液体喷气对于工业流体处理至关重要,但与其他类型相比,其效率较低.
  • 在引进过程中的能量消耗是液体喷气效率降低的主要原因.
  • 关键性能因素包括动力流体压力,喷嘴设计和引力比率.

研究的目的:

  • 研究一种提高液体喷气效率的新方法.
  • 评估阻力降低聚合物 (DRP) 对液体喷气性能的影响.
  • 通过已建立的效率模型来评估DRP的有效性.

主要方法:

  • 使用液体喷气实现水-水循环系统.
  • 引入阻力降低聚合物 (DRPs) 进入喷气的吸气流.
  • 使用各种基于文献的模型评估效率改进.

主要成果:

  • 液体喷气的特定配置导致液体喷气内的阻力显著降低.
  • 效率从13.8%提高到26.7%,相当于阻力减少了46%.
  • 总体来说,的性能被DRP大大提高了.

结论:

  • 减拉聚合物提供了一个可行的解决方案,以提高液体喷射的效率.
  • 整合DRP可以克服喷气能量消散的固有局限性.
  • 介绍了喷气效率的新解释和比较分析.