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Polymer Classification: Architecture

Polymer Classification: Architecture

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...

Polymer Classification: Crystallinity

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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...

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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...

Polymers

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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 properties that they exhibit. Additionally,...

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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...

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

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Highly congested liquid crystal structures: dendrimers, dendrons, dendronized and hyperbranched polymers.

Mercedes Marcos¹, Rafael Martín-Rapún, Ana Omenat

¹Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza - C.S.I.C., 50009 Zaragoza, Spain.

Chemical Society Reviews

|November 6, 2007

Summary

This review explores liquid crystal dendritic polymers, including dendrimers, dendrons, and hyperbranched polymers. It covers their synthesis, mesogenic properties, and supramolecular assembly for advanced materials.

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Area of Science:

Polymer Chemistry
Materials Science
Supramolecular Chemistry

Background:

Liquid crystal dendritic polymers combine properties of liquid crystals and dendritic macromolecules.
These materials offer unique structural and self-assembly characteristics.

Purpose of the Study:

To review diverse liquid crystal dendritic polymer structures.
To illustrate their synthesis and mesogenic properties.
To discuss their supramolecular assembly into liquid crystal architectures.

Main Methods:

Review of existing literature on liquid crystal dendritic polymers.
Categorization of structures into dendrimers, dendrons, dendronized polymers, and hyperbranched polymers.
Analysis of synthesis routes and characterization of mesogenic behavior.

Main Results:

Presentation of representative examples of various LC dendritic architectures.
Discussion of structure-property relationships governing mesogenic behavior.
Examples of controlled supramolecular organization.

Conclusions:

Liquid crystal dendritic polymers represent a versatile class of materials.
Their synthesis and self-assembly offer pathways to novel functional materials.
Further research can unlock advanced applications in materials science.