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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.0K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

2.7K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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One-Step Zwitterionic Modification of Polyamide-Polyurethane Mixed Textile through Acidic Catalyzation.

I-Hsun Yang1, Xing-Yu Wu2, Ying-Nien Chou2

  • 1Department of Chemical and Materials Engineering, Southern Taiwan University of Science and Technology, Tainan 71005, Taiwan.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 19, 2025
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Summary
This summary is machine-generated.

A novel zwitterionic surface modification was developed for polyamide and polyurethane materials. This cost-effective method significantly reduces protein, blood cell, and bacterial attachment, enhancing biocompatibility for biomedical and textile applications.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Surface Chemistry

Background:

  • Polyamide (PA) and polyurethane (PU) materials are widely used but susceptible to biofouling.
  • Biofouling on biomedical devices and textiles leads to reduced performance and increased infection risk.
  • Developing effective antibiofouling surface modifications is crucial for advanced material applications.

Purpose of the Study:

  • To develop a simple, one-step zwitterionic surface modification for polyamide and polyurethane.
  • To impart excellent antibiofouling properties to modified materials.
  • To optimize the modification process for enhanced performance.

Main Methods:

  • A one-step dip-coating method using an epoxy-type biomimetic zwitterionic copolymer, poly(glycidyl methacrylate-co-sulfobetaine acrylamide) (PGSA).
  • Acidic conditions were used to activate polyamide's amine groups for copolymer reaction via ring-opening addition.
  • Optimization of coating parameters including temperature, concentration, copolymer ratio, and pH.

Main Results:

  • The modified polyamide fabric exhibited significantly reduced biofouling.
  • Achieved a 70% reduction in fibrinogen adsorption.
  • Demonstrated a 93% reduction in whole-blood cell attachment, 95% in red blood cell attachment, and 98.2% in bacterial attachment.
  • Enhanced biocompatibility and antibiofouling capabilities were confirmed.

Conclusions:

  • A straightforward and cost-effective zwitterionic surface modification technique for PA and PU was successfully developed.
  • The PGSA modification provides excellent antibiofouling properties and enhanced biocompatibility.
  • This technology shows great potential for biomedical devices and functional textiles.