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相关概念视频

Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.4K
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.
3.4K
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
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
Formation of Intermediate Filaments00:57

Formation of Intermediate Filaments

3.1K
Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been...
3.1K
Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

4.9K
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
4.9K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.7K
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...
2.7K

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相关实验视频

Updated: Jul 13, 2025

Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels
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Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels

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在单个聚合物线圈内部的密度波动

Anatoly E Chalykh1, Uliana V Nikulova1, Vladimir K Gerasimov1

  • 1Frumkin Institute of Physical Chemistry, and Electrochemistry Russian Academy of Sciences (IPCE RAS), 31, Bld.4 Leninsky Prospect, 119071 Moscow, Russia.

Polymers
|October 14, 2023
PubMed
概括

确定了 styrene-butadiene 和 styrene-isoprene 共聚合物的宏分子线圈内的密度波动. 它们的辐射分布使用波振荡模型估计,揭示了对聚合物结构的洞察力.

科学领域:

  • 聚合物科学 聚合物科学
  • 材料科学 材料科学 材料科学
  • 物理化学 物理化学

背景情况:

  • 了解宏分子结构对于聚合物特性至关重要.
  • 基于styrene的共聚物广泛用于各种应用.
  • 内部结构异质性可能会影响聚合物行为.

研究的目的:

  • 研究共聚合物中密度波动的存在和分布.
  • 分析随机和块共聚物的单个宏分子.
  • 估计这些波动的辐射分布.

主要方法:

  • 分析了500多张单个巨分子的图像.
  • 随机测试的 styrene-butadiene 共聚物和 styrene-isoprene 块共聚物.
  • 应用一个波振荡模型用于辐射分布估计.

主要成果:

  • 证实了宏分子线圈内密度波动的存在.
  • 量化了这些密度波动的辐射分布.
  • 提供了对分析共聚合物的内部结构的见解.

结论:

关键词:
密度波动的波动 密度波动聚合物线圈是一种聚合物线圈.辐射分布的功能是辐射分布的功能.

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  • 这些共聚物的宏分子线圈表现出内部密度的变化.
  • 波振荡模型有效地描述了这些波动的辐射分布.
  • 这种详细的结构分析有助于更深入地了解共聚合物的行为.