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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

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...
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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 polymer...
Polymers02:34

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,...
Anionic Chain-Growth Polymerization: Overview01:20

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: Architecture01:14

Polymer Classification: Architecture

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...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Functionally Diverse Nylon-3 Copolymers from Readily Accessible β-Lactams.

Jihua Zhang1, Matthew J Markiewicz, Bernard Weisblum

  • 1Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706.

ACS Macro Letters
|January 29, 2013
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Researchers developed novel beta-lactams for anionic ring-opening polymerization, creating functional nylon-3 materials. These new nylon-3 copolymers exhibit unique self-assembly and biological characteristics.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Nylon-3 polymers are a versatile class of polyamides with potential applications in various fields.
  • Traditional methods for synthesizing functionalized nylon-3 have limitations in scope and efficiency.

Purpose of the Study:

  • To introduce a new family of beta-lactam monomers for the synthesis of functional nylon-3 materials.
  • To explore the self-assembly behavior and biological properties of the resulting nylon-3 copolymers.

Main Methods:

  • Anionic ring-opening polymerization (AROP) of novel beta-lactam monomers.
  • Characterization of synthesized nylon-3 materials and their copolymers.
  • Investigation of self-assembly properties and biological activities.

Main Results:

  • Successful synthesis of nylon-3 materials with diverse appended functionalities (carboxylic acid, thiol, hydroxyl, secondary amine).
  • Demonstration of distinctive self-assembly behavior in the generated nylon-3 copolymers.
  • Observation of unique biological properties associated with the functionalized nylon-3 materials.

Conclusions:

  • The novel beta-lactams provide an effective route to functionalized nylon-3 via AROP.
  • The resulting nylon-3 copolymers offer tunable self-assembly and biological properties for advanced applications.