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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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

Molecular Weight of Step-Growth Polymers

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

Polymers: Molecular Weight Distribution

4.0K
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.
4.0K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.9K
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...
2.9K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

3.4K
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...
3.4K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.5K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.5K

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Updated: Oct 21, 2025

Preparation of DNA-crosslinked Polyacrylamide Hydrogels
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Preparation of DNA-crosslinked Polyacrylamide Hydrogels

Published on: August 27, 2014

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A Note about Crosslinking Density in Imprinting Polymerization.

Anja Mueller1

  • 1Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI 48859, USA.

Molecules (Basel, Switzerland)
|September 10, 2021
PubMed
Summary
This summary is machine-generated.

Molecularly imprinted polymers (MIPs) offer specific binding sites for various applications. This review highlights that crosslinking density significantly impacts MIP properties, but current levels are often too high, necessitating further research for optimization.

Keywords:
MIPcrosslinking densitymolecularly imprinted polymerspecific binding

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Area of Science:

  • Polymer Science
  • Materials Science
  • Analytical Chemistry

Background:

  • Imprinting polymerization creates specific binding sites essential for applications like sensors, detectors, and catalysts.
  • These binding sites are formed using templates and solidified through crosslinking.
  • Crosslinking density is a critical parameter influencing the physical properties, capacity, and selectivity of molecularly imprinted polymers (MIPs).

Purpose of the Study:

  • To review the role of crosslinking density in imprinting polymerization.
  • To analyze current practices in MIP synthesis concerning crosslinking density.
  • To identify the need for further research into optimal crosslinking densities for MIPs.

Main Methods:

  • Literature review of imprinting polymerization techniques and polymer science data.
  • Analysis of existing research on crosslinking density in MIP synthesis.
  • Theoretical examination of polymer science principles related to crosslinking.

Main Results:

  • Crosslinking density is a key factor governing the physical properties, capacity, and selectivity of MIPs.
  • The commonly employed crosslinking density in MIP synthesis is often unusually high.
  • Existing data and theory suggest a lack of understanding regarding optimal crosslinking densities.

Conclusions:

  • Further research is required to determine the optimal crosslinking density for molecularly imprinted polymers.
  • Optimizing crosslinking density could enhance the performance of MIPs in various applications.
  • A deeper understanding of crosslinking's impact is crucial for advancing imprinting polymerization technology.