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Related Concept Videos

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,...
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,...
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,...
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...
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...
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...

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Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization
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Comb polymers prepared by ATRP from hydroxypropyl cellulose.

Emma Ostmark1, Simon Harrisson, Karen L Wooley

  • 1Royal Institute of Technology, KTH Fibre and Polymer Technology, Teknikringen 56-58, 100 44 Stockholm, Sweden.

Biomacromolecules
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Summary

This study created novel comb polymers using hydroxypropyl cellulose (HPC) as a core for controlled grafting. Dendronization of HPC influenced the nanometer-sized graft copolymers

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Controlled polymerization techniques are crucial for designing advanced polymer architectures.
  • Hydroxypropyl cellulose (HPC) offers a versatile platform for chemical modification.
  • Graft copolymers with well-defined structures are sought after for specialized applications.

Purpose of the Study:

  • To synthesize densely grafted comb polymers using hydroxypropyl cellulose (HPC) as a core.
  • To investigate the effect of initiator-functionalized dendrons on polymer grafting.
  • To create amphiphilic block copolymer grafts with tunable properties.

Main Methods:

  • Atom Transfer Radical Polymerization (ATRP) for controlled monomer grafting from HPC macroinitiators.
  • Synthesis of macroinitiators by reacting HPC with ATRP initiators or dendrons.
  • Characterization using 1H NMR, FT-IR, DSC, TGA, rheology, DLS, and AFM.

Main Results:

  • Successfully produced comb (co)polymers with high degrees of functionality via "grafting from" ATRP.
  • Obtained amphiphilic block copolymer grafts by chain extension and selective acidolysis.
  • Characterized nanometer-sized graft copolymers, revealing dendronization's impact on rheological behavior.

Conclusions:

  • Densely grafted comb polymers and amphiphilic block copolymers were synthesized using HPC as a core.
  • The incorporation of dendrons significantly influenced the properties of the resulting graft copolymers.
  • The developed methodology provides a route to novel nanostructured materials with tunable characteristics.