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相关概念视频

Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.2K
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.
3.2K
Polymers02:34

Polymers

34.4K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
34.4K
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: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.4K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.7K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.7K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.4K
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...
3.4K

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相关实验视频

Updated: May 22, 2025

Polymer Microarrays for High Throughput Discovery of Biomaterials
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Polymer Microarrays for High Throughput Discovery of Biomaterials

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PolyCrit:一个在线合作平台,用于聚合物表征.

Brinton King Eldridge1, Dillon T A Baker1, Yongmei Wang1

  • 1Department of Chemistry, University of Memphis, Memphis, TN, 38152, USA.

Journal of chromatography. A
|March 12, 2025
PubMed
概括
此摘要是机器生成的。

临界条件下的聚合物液态色谱 (LCCC) 通过使化时间独立于分子量来简化聚合物分析. 一个新的数据库,PolyCrit,组织了关键的LCCC条件,以增强这种强大的分离技术.

关键词:
一个协作平台合作平台.数据库数据库数据库是一个数据库.临界条件下的液体染色学 (LCCC)机器学习是机器学习.聚克里特 (PolyCrit) 是一种复合材料.聚合物的聚合物.

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Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization
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Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization

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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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Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization
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Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization

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科学领域:

  • 聚合物科学 聚合物科学
  • 染色体学 染色体学 是一种染色学.
  • 分析化学 分析化学

背景情况:

  • 临界条件下的聚合物液态色谱 (LCCC) 能够根据聚合物拓,分支和终端组功能进行分离,通过使化时间独立于分子重量.
  • 由于复杂的优化和碎片化的数据,LCCC的潜力受到限制,这阻碍了其广泛应用.
  • 现有的关于LCCC条件的文献分散,需要对研究人员进行广泛的搜索.

研究的目的:

  • 为了应对LCCC优化和数据可访问性的挑战.
  • 开发一个集中,可搜索的聚合物关键染色学条件的数据库.
  • 为了促进使用LCCC用于先进的聚合物表征.

主要方法:

  • 开发了PolyCrit,一个在线数据库,编译了428个关键染色学条件.
  • 根据33个关键参数组织数据,包括聚合物,溶剂和静止相.
  • 实施了数据可靠性的质量评分系统和社区贡献的验证过程.

主要成果:

  • PolyCrit将数十年的LCCC文献集中到一个单一的,可访问的平台上.
  • 该数据库提供了关于聚合物,溶剂,静态相和色谱参数的详细信息.
  • 质量评分系统和验证过程提高了数据的可靠性.

结论:

  • PolyCrit显著减少了用于应用LCCC的文献搜索所需的努力.
  • 该数据库促进了LCCC在聚合物分析中的更广泛采用和应用.
  • 鼓励研究人员贡献他们的实验数据来扩大数据库.