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相关概念视频

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.7K
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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Laminar Flow01:27

Laminar Flow

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Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
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相关实验视频

Updated: Jan 6, 2026

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

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在散装聚合物流中最大分散减小.

Yi-Bao Zhang1,2, Feng Wang1, Sheng-Hong Peng1

  • 1Northwestern Polytechnical University, Institute of Extreme Mechanics, School of Aeronautics, National Key Laboratory of Aircraft Configuration Design, Key Laboratory for Extreme Mechanics of Aircraft of Ministry of Industry and Information Technology, Xi'an 710072, China.

Physical review letters
|October 25, 2025
PubMed
概括
此摘要是机器生成的。

流体中的聚合物添加剂产生两种模式:减散减散和最大减散减散 (MDR). 具有板状的MDR模式,发生在聚合物效应达到积分长度尺度时.

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Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
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科学领域:

  • 流体动力学 流体动力学
  • 聚合物物理 聚合物物理
  • 流研究 流研究

背景情况:

  • 聚合物流涉及流体流和聚合物添加剂之间的复杂相互作用.
  • 了解能量消散和结构对于描述这些流动至关重要.

研究的目的:

  • 在散装聚合物流中实验性地研究流动模式和结构.
  • 确定导致最大消散减少 (MDR) 的条件,并描述相关的流量结构.

主要方法:

  • 使用了高分辨率的三维速度测量.
  • 分析重点是聚合物度对能量消散和动态的影响.

主要成果:

  • 确定了两种不同的聚合物对能量消耗的影响模式:减少消耗和MDR.
  • 发现,当受聚合物影响的尺度达到积分长度尺度,而不是Lumley尺度时,MDR制度就会发生.
  • 在MDR制度中,板状和应变结构占主导地位,稳定了剪切层.

结论:

  • MDR 模式代表了在散装聚合物流中普遍的流动状态.
  • 结果提供了聚合物流的相位图和对粘弹性流体流动模式的见解.
  • 在MDR中,板状状结构很重要,有助于预测流动行为.