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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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.
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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.
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.
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Polymers02:34

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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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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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Constructing high-performance TADF polymers from non-TADF monomers: a computational investigation.

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Designing thermally activated delayed fluorescence (TADF) polymers is challenging. This study reveals that specific polymerization sites and substituents on carbazole monomers can efficiently create effective TADF polymers for solution processing.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Computational Chemistry

Background:

  • Thermally activated delayed fluorescence (TADF) polymers offer solution processability for large-area applications.
  • Designing TADF polymers lacks established molecular construction guidelines, hindering material development.

Purpose of the Study:

  • To computationally investigate the construction of TADF polymers from non-TADF monomers.
  • To elucidate the impact of polymerization sites, substituent positions, and types on TADF polymer properties.

Main Methods:

  • Systematic computational investigation of TADF polymer construction.
  • Analysis of structure-property relationships based on polymerization parameters.

Main Results:

  • 3,6-carbazole-based monomers with substituents are efficient for building TADF polymers due to π-conjugation.
  • Polymers from para-phenyl-substituted monomers show promise with separated frontier orbitals, small ΔEST, favorable energy levels, and bipolar charge transport.

Conclusions:

  • Findings provide crucial insights into TADF polymer construction mechanisms and molecular design principles.
  • Para-phenyl-substituted carbazole-based polymers are highly attractive for experimental investigation and future applications.