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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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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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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...
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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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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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Related Experiment Video

Updated: Mar 11, 2026

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Coding and decoding libraries of sequence-defined functional copolymers synthesized via photoligation.

Nicolas Zydziak1,2, Waldemar Konrad1,2, Florian Feist1,2

  • 1Soft Matter Synthesis Laboratory, Institut für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.

Nature Communications
|December 1, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel photochemical method to precisely synthesize sequence-defined artificial macromolecules. This breakthrough allows for controlled placement of functional groups, enabling the creation of complex polymer architectures.

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Area of Science:

  • Polymer Chemistry
  • Macromolecular Science
  • Photochemistry

Background:

  • Designing artificial macromolecules with precise sequence control is a significant synthetic challenge.
  • Existing methods often lack the precision required for complex macromolecular architectures.
  • The ability to dictate monomer sequence is crucial for advanced material properties.

Purpose of the Study:

  • To develop a light-induced photochemical strategy for synthesizing sequence-defined linear macromolecules.
  • To demonstrate the versatility of this approach for creating polymers with varied chemical constitutions and topologies.
  • To confirm the precise sequence control and read the encoded information within the synthesized macromolecules.

Main Methods:

  • Utilized a photochemical approach combining sequential and modular monomer addition.
  • Synthesized functional linear macromolecules up to decamers.
  • Employed in-depth characterization techniques to confirm macromolecular precision.
  • Applied tandem mass spectrometry for decoding sequence information.

Main Results:

  • Achieved synthesis of monodisperse, sequence-defined functional linear macromolecules.
  • Demonstrated the ability to place specific functions at arbitrary positions along the polymer chain.
  • Created a library of functional homopolymers, alternating copolymers, and block copolymers.
  • Successfully decoded the molecular sequence information using tandem mass spectrometry.

Conclusions:

  • The presented photochemical strategy offers a viable and advanced method for coding individual monomer units in a macromolecular chain.
  • This approach enables the precise synthesis of complex, functional macromolecules with absolute sequence order.
  • The ability to decode sequence information validates the precision and utility of the synthetic method.