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Molecular Weight of Step-Growth Polymers01:08

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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.
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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...
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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.
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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight.  So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
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Dynamic Covalent Polymeric Foams: En Route to a Sustainable Lightness.

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This review explores dynamic covalent polymer foams (DCPFs), which offer recyclability and sustainability. These advanced materials address environmental challenges posed by traditional polymer foam waste.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Chemistry

Background:

  • Polymer foams are widely used but generate significant waste with limited end-of-life options.
  • Developing circular alternatives is crucial for environmental sustainability.
  • Dynamic covalent polymer networks (DCPNs) offer a promising approach.

Purpose of the Study:

  • To review strategies, processes, materials, and functions of dynamic covalent polymer foams (DCPFs).
  • To bridge the knowledge gap regarding DCPFs in the context of sustainable materials.
  • To highlight the alignment of DCPFs with the United Nations Sustainable Development Goals (UN SDGs).

Main Methods:

  • Review of existing literature on dynamic exchange chemistry and polymer networks.
  • Analysis of strategies for incorporating dynamic covalent bonds (DCBs) into polymer foams.
  • Categorization of different DCPF designs and their associated properties.

Main Results:

  • DCPFs enable recyclability and multifunctionality without sacrificing mechanical strength or dimensional stability.
  • Dynamic exchange reactions allow for thermally induced topological rearrangements, unlocking new material functionalities.
  • The development of DCPFs redefines the polymer foam value chain towards circular economy principles.

Conclusions:

  • DCPFs represent a significant advancement in sustainable materials science.
  • Further research into DCPF design and application is warranted.
  • These materials offer a viable solution to the environmental challenges of polymer foam waste.