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相关概念视频

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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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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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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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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使用全频谱方法 (FSM) 的无标准,定量SIMS:第一部分.

Nicolas Molina1,2, John F Curry3, Filippo Mangolini1,4

  • 1Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States.

Analytical chemistry
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概括

全频谱法 (FSM) 允许使用飞行时间二次离子质谱法 (ToF-SIMS) 对聚烯等聚合物进行定量分析. 这种方法最大限度地减少了矩阵效应,以便更准确地表征表面.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 表面化学 表面化学
  • 分析化学 分析化学

背景情况:

  • 飞行时间二次离子质谱 (ToF-SIMS) 是一种强大的表面分析技术.
  • 定量ToF-SIMS分析由于矩阵效应而具有挑战性,限制了其在聚合物表征中的应用.

研究的目的:

  • 为了证明全频谱方法 (FSM) 对同聚合物的定量ToF-SIMS分析的有效性.
  • 建立FSM作为一个可靠的工具,用于精确地表征聚合物材料的表面.

主要方法:

  • 使用全频谱方法 (FSM) 来分析来自同聚合物 (聚烯,聚烯,PTFE) 的喷射二次离子.
  • 获取了ToF-SIMS数据,同时改变了初级离子流动,以评估离子诱导的损伤.
  • 将实验数据与离子诱导的表面损伤的理论预测进行了比较.

主要成果:

  • 在聚合物的ToF-SIMS分析中,FSM有效地减少了矩阵效应.
  • 变化的初级离子流动提供了数据来评估离子轰炸对量化的影响.
  • 证明了FSM能够准确地对聚合物表面进行多元组件分析的能力.

结论:

  • 全频谱法是一种强大的技术,用于对聚合物进行定量ToF-SIMS分析.
  • 这一进步使得使用ToF-SIMS的聚合物材料能够更精确地进行表面表征.