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相关概念视频

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

2.4K
Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
2.4K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.1K
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.
3.1K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.1K
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...
2.1K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

1.9K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
1.9K
Polymers: Defining Molecular Weight01:01

Polymers: Defining Molecular Weight

2.7K
Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight.  So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...
2.7K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.6K
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...
2.6K

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相关实验视频

Updated: May 10, 2025

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

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介绍一种算法,以准确确定共聚合物块长度分布.

Rick S van den Hurk1, Ynze Mengerink2, Ron A H Peters3

  • 1Analytical Chemistry Group, Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, the Netherlands; Centre for Analytical Sciences Amsterdam (CASA), the Netherlands.

Analytica chimica acta
|April 19, 2025
PubMed
概括

一个新的算法准确地确定共聚合物块长度分布 (BLDs),这是一个关键但具有挑战性的材料属性. 该方法为先进材料开发提供可靠的BLD分析.

关键词:
区块长度分布 区块长度分布机器学习 机器学习聚合物表征 聚合物表征

更多相关视频

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

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

Published on: June 10, 2018

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相关实验视频

Last Updated: May 10, 2025

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
11:42

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

7.7K
Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
10:53

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

13.9K
Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight MALDI-TOF Mass Spectrometry
06:56

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

Published on: June 10, 2018

24.9K

科学领域:

  • 聚合物化学 聚合物化学
  • 材料科学 材料科学 材料科学
  • 计算化学计算化学

背景情况:

  • 同聚合物对于医药和航空航天领域的先进材料至关重要.
  • 材料属性可以通过分子量,组成和块长分布 (BLD) 来调整.
  • 对共聚物BLD的准确分析表征仍然是一个重大挑战.

研究的目的:

  • 为准确确定共聚合物块长度分布 (BLDs) 开发一种新的算法.
  • 建立一种使用模拟数据客观评估BLD表征算法的方法.

主要方法:

  • 使用重复采样或分析解决方案对共聚物和碎片的计算模拟.
  • 开发一种与优化算法相结合的新型分析解决方案.
  • 使用模拟碎片数据对算法性能进行评估,高达四聚体水平.

主要成果:

  • 开发的算法准确地确定共聚合物BLDs.
  • 一个信任区域反射算法显示高准确度与四度层级碎片数据.
  • 输入数据噪声带来了较小的输出噪声,但没有显著影响整体性能.

结论:

  • 拟议的算法显著优于BLD确定现有方法.
  • 本研究为使用模拟数据的BLD算法提供了第一个客观评估框架.
  • 该算法显示了分析实验性共聚合物碎片数据的巨大潜力.