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Related Concept Videos

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Actin Polymerization01:42

Actin Polymerization

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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight...
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Step-Growth Polymerization: Overview01:03

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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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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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Actin Polymerization and Cell Motility01:13

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Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications
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Acetic-Acid Plasma-Polymerization on Polymeric Substrates for Biomedical Application.

Shu-Chuan Liao1,2, Ko-Shao Chen3, Jui-Lung Chien3

  • 1Institute of Biomedical Engineering, National Taiwan University, Taipei 106, Taiwan. liaozizi@mail.dyu.edu.tw.

Nanomaterials (Basel, Switzerland)
|July 3, 2019
PubMed
Summary

Cold plasma treatment using acetic acid enhances polymeric substrates with carboxylic acid groups, improving hydrophilicity and embryonic stem cell adhesion for biomedical applications.

Keywords:
acetic acidhydrophilicplasma polymerizationsurface modification

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Regenerative Medicine

Background:

  • Cold plasma is a promising technology for regenerative medicine and tissue engineering.
  • Surface modification of polymeric substrates is crucial for enhancing biocompatibility.

Purpose of the Study:

  • To characterize carboxylic acid functional groups deposited on polymeric substrates via plasma polymerization.
  • To evaluate the impact of acetic acid plasma treatment on substrate hydrophilicity and cell adhesion.

Main Methods:

  • Plasma polymerization using an acetic acid precursor.
  • Surface analysis using electron spectroscopy for chemical analysis (ESCA).
  • In vitro cell culture studies with embryonic stem cells.

Main Results:

  • Acetic acid plasma deposition created polylactide-like films containing C-C, C-O, and C=O groups.
  • ESCA confirmed increased polar components on treated surfaces, enhancing hydrophilicity.
  • Embryonic stem cell adhesion significantly improved on plasma-treated substrates compared to untreated ones.

Conclusions:

  • Acetic acid plasma treatment effectively modifies polymeric surfaces to improve hydrophilic properties.
  • The enhanced surface characteristics promote better embryonic stem cell adhesion.
  • This technique shows potential for developing advanced surface coatings in biomedical applications.