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Polymers02:34

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...
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Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
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During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
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Polymer Brushes: Efficient Synthesis and Applications.

Chun Feng1, Xiaoyu Huang1

  • 1Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry , University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , People's Republic of China.

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Summary
This summary is machine-generated.

Researchers developed efficient methods to create 1D, 2D, and 3D polymer brushes with controlled structures. These advanced polymer brushes show promise for applications in drug delivery, antifouling coatings, catalysis, and lithium-ion batteries.

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Area of Science:

  • Polymer Science and Materials Chemistry
  • Macromolecular Chemistry
  • Surface Science

Background:

  • Polymer brushes are macromolecular structures with polymer chains tethered to a core structure.
  • They exhibit unique properties like wormlike conformation and altered surface characteristics.
  • Applications span catalysis, drug delivery, and optoelectronics.

Purpose of the Study:

  • To summarize recent efforts in developing efficient synthetic protocols for 1D, 2D, and 3D polymer brushes.
  • To explore the potential applications of these polymer brushes in various fields.
  • To highlight advancements and challenges in precisely controlling polymer brush composition, structure, and functionality.

Main Methods:

  • Development of efficient methods for preparing polymer brushes with controlled composition and structure.
  • Utilizing living/controlled polymerization techniques combined with monomer design.
  • Employing a "trifunctional monomer" strategy for asymmetric (Janus-type) 1D polymer brushes using ATRP and CuAAC click reactions.
  • Applying noncovalent strategies based on crystallization-driven self-assembly for well-defined polymer brushes.

Main Results:

  • Successful synthesis of 1D, 2D, and 3D polymer brushes with precise control over structure and functionality.
  • Demonstration of a versatile platform for synthesizing complex asymmetric polymer brushes.
  • Preparation of linear polymer brushes up to tens of micrometers using crystallization-driven self-assembly.
  • Exploration of applications in drug delivery, antifouling coatings, catalysis, and lithium-ion batteries.

Conclusions:

  • Advancements in synthetic methods enable the creation of sophisticated polymer brushes.
  • Polymer brushes are versatile building blocks for functional materials.
  • Further development of efficient synthetic protocols is crucial for advancing polymer brush technology.