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Related Concept Videos

SDS-PAGE01:27

SDS-PAGE

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Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
A variation of gel electrophoresis, termed  polyacrylamide gel electrophoresis (PAGE), is commonly used for separating proteins according to their molecular size by passing them through a polyacrylamide gel. Because of the varying charges associated with amino acid side chains, PAGE can be used to separate intact...
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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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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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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.
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Updated: Jan 1, 2026

Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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How starch-g-poly(acrylamide) molecular structure effect sizing properties.

Lili Wang1, Xun Zhang1, Jin Xu1

  • 1Key Laboratory of Science and Technology of Eco-Textile, Ministry of Education, Jiangnan University, 1800 Lihu AVE, Wuxi 214122, Jiangsu, China.

International Journal of Biological Macromolecules
|December 22, 2019
PubMed
Summary
This summary is machine-generated.

Grafting poly(acrylamide) onto starch improved cotton yarn strength, but reduced starch film strength. Starch

Keywords:
AcrylamideApparent viscosity;adhesionFilm mechanical propertiesGrafted starch

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Area of Science:

  • Polymer Chemistry
  • Textile Science
  • Materials Science

Background:

  • Starch-g-poly(acrylamide) (S-g-PAM) is a modified polymer with potential applications in textile sizing.
  • Understanding the relationship between S-g-PAM molecular structure and sizing performance is crucial for optimizing its use.

Purpose of the Study:

  • To investigate how the molecular structure of S-g-PAM affects its sizing properties.
  • To correlate structural parameters with apparent viscosity, adhesion to cotton yarns, and film mechanical properties.

Main Methods:

  • Synthesis of S-g-PAM using horseradish peroxidase (HRP) catalysis.
  • Characterization of S-g-PAM using Fourier transform infrared (FT-IR) spectroscopy and 1H nuclear magnetic resonance (1H NMR).
  • Evaluation of sizing properties including apparent viscosity, adhesion, and film mechanical strength.

Main Results:

  • Fourier transform infrared (FT-IR) confirmed successful grafting of acrylamide (AM) units onto starch.
  • Apparent viscosity showed no clear correlation with degree of branching (DB) or degree of substitution (DS)/grafting ratio (GR), suggesting native starch amylose content is influential.
  • Higher DS (or GR) positively correlated with tensile strength of sized cotton yarns but negatively correlated with starch film tensile strength.

Conclusions:

  • The molecular structure of S-g-PAM significantly impacts its sizing properties.
  • Optimizing S-g-PAM for textile sizing requires balancing yarn strength enhancement with film integrity.
  • Results offer guidance for selecting starch-based materials with tailored sizing performance.