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Related Concept Videos

Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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.
Many natural and synthetic polymers are produced by...
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Dehydration Synthesis01:15

Dehydration Synthesis

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Overview
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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Aldehydes and Ketones with Water: Hydrate Formation01:20

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An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
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Molecular Weight of Step-Growth Polymers01:08

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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...
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Oligomeric hydrogels self-assembled from reduction-controlled condensation.

Shuang Liu1, Anming Tang, Maolin Xie

  • 1CAS Key Laboratory of Soft Matter Chemistry, Department of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026 (China) http://lianglab.ustc.edu.cn/

Angewandte Chemie (International Ed. in English)
|January 30, 2015
PubMed
Summary

Researchers developed novel oligomeric hydrogels using biocompatible condensation. These advanced hydrogels show potential for long-term drug delivery due to their self-assembly, mechanical strength, and biodegradability.

Keywords:
hydrogelnanostructuresoligomerizationself-assembly

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Area of Science:

  • Materials Science
  • Biotechnology
  • Polymer Chemistry

Background:

  • Polymer and small-molecule-based (SMB) supramolecular hydrogels are well-researched.
  • Oligomeric hydrogels present synthetic challenges and difficulties in controlling amphiphilicity.

Purpose of the Study:

  • To rationally design precursors for oligomeric hydrogel synthesis.
  • To develop a biocompatible condensation method for creating oligomeric hydrogels.
  • To investigate the self-assembly and properties of the resulting hydrogels.

Main Methods:

  • Rational design of two precursors: Cys(SEt)-Lys-CBT (1) and (Cys-Lys-CBT)2 (2).
  • Glutathione reduction to yield the gelator Cys-Lys-CBT (3).
  • Biocompatible condensation of gelator 3 to form amphiphilic cyclic oligomers.
  • Characterization of hydrogel self-assembly into nanofibers and mechanical properties.

Main Results:

  • Successful synthesis of oligomeric hydrogels via biocompatible condensation.
  • Oligomers self-assembled into nanofibers, forming hydrogels with consistent mechanical properties.
  • Chemical analysis identified a cyclic dimer as the primary condensation product.
  • The hydrogels exhibit biocompatibility, suitable mechanical strength, and biodegradability.

Conclusions:

  • A novel method for synthesizing oligomeric hydrogels using biocompatible condensation has been established.
  • The resulting cyclic dimer-based hydrogels demonstrate promising characteristics for biomedical applications.
  • These oligomeric hydrogels hold potential for future use in long-term drug delivery systems.