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Related Concept Videos

Polymers02:34

Polymers

36.0K
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...
36.0K
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
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.5K
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...
2.5K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.6K
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.
3.6K
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
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.3K
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...
2.3K

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Updated: Aug 13, 2025

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering
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Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering

Published on: December 21, 2017

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Conjugated Polymers in Solution: A Physical Perspective.

Yu-Chun Xu1, Li Ding1, Ze-Fan Yao1

  • 1Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing100871, China.

The Journal of Physical Chemistry Letters
|January 20, 2023
PubMed
Summary
This summary is machine-generated.

Controlling conjugated polymer aggregation in solution is key to improving optoelectronic properties. Understanding polymer physics helps tailor solution-state aggregation for high-performance polymer devices.

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Optoelectronics

Background:

  • Optoelectronic properties of conjugated polymers are significantly influenced by their aggregation behavior.
  • Understanding solution-state aggregation and microstructure is crucial but challenging due to polymer complexity.

Purpose of the Study:

  • To provide a comprehensive perspective on the chain conformations and solution-state aggregation of conjugated polymers.
  • To elucidate the factors influencing aggregation, including chemical structure and environmental conditions, from a polymer physics viewpoint.

Main Methods:

  • Review and synthesis of existing literature on conjugated polymer aggregation.
  • Analysis of polymer physics principles governing solution behavior.

Main Results:

  • Detailed discussion of factors affecting solution-state aggregation and microstructures.
  • Identification of multiple interactions governing conjugated polymer behavior in solution.

Conclusions:

  • A deeper understanding of solution-state aggregation is vital for controlling solid-state microstructures.
  • Strategies for tuning aggregation can lead to high-performance polymer-based devices.