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相关概念视频

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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相关实验视频

Updated: Sep 17, 2025

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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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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通过扩散顺序光谱学 (DOSY) 确定聚合物分散性

Igor W F Silva1, Alasdair McKay2, Tanja Junkers1

  • 1School of Chemistry, Polymer Reaction Design group, Monash University, Clayton, VIC, Australia.

Macromolecular rapid communications
|July 3, 2025
PubMed
概括
此摘要是机器生成的。

扩散顺序的NMR光谱学 (DOSY) 可以准确地确定聚合物分散率 (Ð) 和分子质量,即使对于更广泛的分布. 标准偏差 (σ) 显示出更好的相关性比分散性,用于聚合物表征.

关键词:
分散性 分散性.分子重量 分子重量公共投资投资公司 (PDI)现在的PFG-NMR是什么?标准偏差的标准偏差是什么

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Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight MALDI-TOF Mass Spectrometry
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科学领域:

  • 聚合物化学 聚合物化学
  • 分析化学 分析化学
  • 频谱学是一种光谱学.

背景情况:

  • 分散性 (Ð) 是一个关键的聚合物特性.
  • 尺寸排除色谱 (SEC) 是分散性测定的标准.
  • 扩散顺序的NMR光谱学 (DOSY) 显示出对分子质量确定有希望的结果,但在分散性方面存在困难.

研究的目的:

  • 评估DOSY,以可靠地测量聚合物中的分散性.
  • 为了对各种聚烯的SEC和DOSY测量进行相关性.
  • 评估DOSY在确定摩尔质量分布 (MMD) 的准确性.

主要方法:

  • 合成26种不同分散度 (1.13.7) 和摩尔质量 (3.022.4 kg·mol-1) 的聚乙烯.
  • 来自SEC和DOSY的摩尔质量分布 (MMD) 数据的比较.
  • 应用反拉普拉斯变换 (ILT) 对于DOSY分析.

主要成果:

  • DOSY-ILT准确地确定了数量和重量平均摩尔质量,使得分散计算成为可能.
  • 逆拉普拉斯转换 (ILT) 努力为非狭分散的聚合物表示MMD形状.
  • SEC和DOSY-ILT显示了高达 Ð = 2.0.0 的良好相关性.
  • 标准偏差 (σ) 和变化系数在研究范围内的SEC更好地相关.

结论:

  • DOSY是一种可行的技术,用于准确的聚合物分散和摩尔质量确定.
  • 与分散性相比,标准偏差 (σ) 为聚合物表征提供了更好的相关性.
  • DOSY 扩展了聚合物分析能力,超越了传统的 SEC 方法.