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Characteristics and Nomenclature of Copolymers

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...

Anionic Chain-Growth Polymerization: Overview

Anionic Chain-Growth Polymerization: Overview

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,...

Polymer Classification: Stereospecificity

Polymer Classification: Stereospecificity

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...

Molecular Weight of Step-Growth Polymers

Molecular Weight of Step-Growth Polymers

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...

Cationic Chain-Growth Polymerization: Mechanism

Cationic Chain-Growth Polymerization: Mechanism

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 generated carbocation,...

Polymers

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...

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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

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Charged polystyrene nanoparticles: role of ionic comonomers structures.

Dhamodaran Arunbabu¹, Tushar Jana

¹School of Chemistry, University of Hyderabad, Hyderabad, India.

Journal of Colloid and Interface Science

|June 25, 2011

Summary

The structure of ionic comonomers significantly impacts styrene emulsion copolymerization kinetics and particle characteristics. Monomer structure dictates particle size, self-assembly, and light diffraction properties.

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Assembly and Characterization of Polyelectrolyte Complex Micelles

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Assembly and Characterization of Polyelectrolyte Complex Micelles

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Area of Science:

Polymer Chemistry
Materials Science

Background:

Emulsion copolymerization is a key process for synthesizing polymer particles.
Ionic comonomers influence particle properties and self-assembly behavior.

Purpose of the Study:

Investigate the effect of ionic comonomer structure on styrene emulsion copolymerization kinetics.
Analyze how monomer structure affects particle size, morphology, charge density, and self-assembly.
Understand the relationship between surfactant concentration and particle size exponents.

Main Methods:

Emulsion copolymerization of styrene with acrylic acid (AAc), methacrylic acid (MAA), 2-hydroxyethyl methacrylate (HEMA), and sodium styrene sulfonate (NaSS).
Analysis of copolymerization kinetics, particle size (D) versus surfactant concentration (S) exponents.
Characterization of particle morphology, charge density, and self-assembly behavior.

Main Results:

Copolymerization kinetics and D vs. S exponents are highly dependent on ionic comonomer structure.
Nucleation regime (homogeneous vs. micellar) alters the order of exponents.
Hydrophobic/hydrophilic balance and steric factors drive variations in D vs. S exponents.
Surface charges induce particle self-assembly and visible light diffraction obeying Bragg's law.

Conclusions:

Ionic comonomer structure is a critical determinant in styrene emulsion copolymerization.
Particle size, self-assembly, and optical properties are tunable via comonomer selection and surfactant concentration.
This study provides insights into designing functional polymer particles with controlled self-assembly and optical characteristics.