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相关概念视频

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.8K
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...
2.8K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.2K
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...
2.2K
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

3.1K
Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
3.1K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.5K
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.
3.5K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.9K
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...
2.9K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.3K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
2.3K

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相关实验视频

Updated: Jul 20, 2025

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
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Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application

Published on: March 8, 2019

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对聚聚及其相关聚氨的微观结构特征和机械洞察力.

Anthony P Gies1, David M Hercules2, Arjun Raghuraman3

  • 1Core R&D, The Dow Chemical Company, Lake Jackson, Texas, USA.

Mass spectrometry reviews
|August 3, 2023
PubMed
概括

质谱学可以快速鉴定用于工业研发的醇基酸盐和共聚物. 这使得用于先进材料的新催化剂和聚聚混合物的高效开发成为可能.

关键词:
宏分子架构的宏分子架构聚乙烯聚醇 (Polyether) 是一种聚乙烯聚醇.聚氨是一种聚氨.双联质谱质量测量技术

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Stabilizing Hepatocellular Phenotype Using Optimized Synthetic Surfaces

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相关实验视频

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Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces
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科学领域:

  • 分析化学 分析化学
  • 聚合物科学 聚合物科学
  • 有机化学 有机化学

背景情况:

  • 氧酸盐和共聚物在各种工业中至关重要.
  • 需要有效的表征方法来优化流程.
  • 对于复杂的混合物,当前的分析技术可能会耗时.

研究的目的:

  • 审查用于醇基酸盐和共聚物表征的分析工具.
  • 为快速的工业研发强调质谱学.
  • 为了展示一种新的以催化剂为基础的氧化过程.

主要方法:

  • 矩阵辅助激光脱/离子化质谱 (MALDI-MS) 和合MS用于组件分析.
  • 开发一种基于催化剂的三 (pentafluorophenyl) (FAB) 的氧化工艺.
  • 二维液态色谱 (2D-LC),超临界流体色谱 (SFC) 和离子流动性分离与MS相结合.

主要成果:

  • MALDI-MS和协同MS有效地分析了模型聚氨泡组件.
  • 一个新的FAB催化剂使下一代共聚合物的高效氧化成为可能.
  • 先进的分离技术与MS相结合,在表征复杂的聚乙烯聚合物中表现出高效率.

结论:

  • 质谱是用于快速表征和优化氧酸盐和共聚合物合成过程的强大工具.
  • 开发的FAB催化剂和氧化过程提供了更高的效率.
  • 多维分离技术与MS相结合,提供复杂的聚乙烯聚合物混合物的全面分析.