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Polymer Classification: Stereospecificity01:26

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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...
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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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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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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Functionalized Celluloses with Regular Substitution Pattern by Glycosynthase-Catalyzed Polymerization.

Victoria Codera1, Kevin J Edgar2, Magda Faijes1

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Researchers developed a new method for creating polymers with controlled sequences, mimicking nature's ability to synthesize complex polysaccharides. This breakthrough enables the creation of novel biomaterials with precisely engineered structures and functions.

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Area of Science:

  • Polymer Chemistry
  • Biomaterials Science
  • Carbohydrate Chemistry

Background:

  • Chemical synthesis struggles to control monomer sequence in polymers, unlike natural biosynthesis of polysaccharides.
  • This limitation hinders the development of biomaterials that mimic the structure-activity relationships of natural polysaccharides.

Purpose of the Study:

  • To introduce a novel enzyme-catalyzed polymerization approach for synthesizing polysaccharides with controlled sequences and functionalization patterns.
  • To utilize cellulose as a versatile scaffold for creating advanced biomaterials.

Main Methods:

  • Employed enzyme-catalyzed polymerization of modified building blocks using a glycosynthase.
  • Utilized the Humicola insolens cellulase Cel7B E197A mutant for polymerization.
  • Synthesized a perfectly alternating polysaccharide with a 6'-azido-6'-deoxycellobiose repeat unit.

Main Results:

  • Successfully prepared a polysaccharide with a controlled, perfectly alternating sequence.
  • Demonstrated a regular substitution pattern in the synthesized polysaccharide.
  • Achieved further functionalization of the polysaccharide to create novel cellulose derivatives.

Conclusions:

  • Enzyme-catalyzed polymerization offers a powerful and simple route to sequence-controlled polysaccharides.
  • This method allows for precise control over polysaccharide structure and functionalization, paving the way for new biomaterials.
  • The developed approach enables the creation of novel modified cellulose derivatives with regular substitution patterns.