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Related Concept Videos

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 Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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.
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...
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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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...
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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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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Informational Polymers with Precise Carbamate Sequences.

Itab Youssef1,2, Svetlana Samokhvalova1,2, Isaure Sergent3

  • 1Université de Strasbourg, CNRS, ISIS, 8 allée Gaspard Monge, 67000 Strasbourg, France.

Precision Chemistry
|August 29, 2025
PubMed
Summary
This summary is machine-generated.

Sequence-defined oligocarbamates were synthesized using orthogonal iterative chemistry. This method allows for the creation of aperiodic carbamate sequences and provides insights into macromolecular fragmentation.

Keywords:
Information-containing polymersMass spectrometrySequence-controlled polymersSequencingSolid-phase synthesis

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Macromolecular Science

Background:

  • Solid-phase synthesis offers a versatile platform for constructing complex molecular architectures.
  • Oligocarbamates represent a class of polymers with tunable properties.
  • Precise control over monomer sequencing is crucial for developing advanced functional materials.

Purpose of the Study:

  • To develop a method for synthesizing sequence-defined oligocarbamates.
  • To investigate the formation of both classical urethane and N-substituted urethane linkages.
  • To characterize the synthesized polymers and explore their fragmentation behavior.

Main Methods:

  • Orthogonal iterative chemistry on a modified Wang solid support.
  • Utilizing amino alcohol building blocks with primary or secondary amines.
  • Characterization techniques including Nuclear Magnetic Resonance (NMR), Size Exclusion Chromatography (SEC), and Electrospray Ionization Mass Spectrometry (ESI-MS).

Main Results:

  • Successful synthesis of sequence-defined oligocarbamates with varying monomer sequences and chain lengths.
  • Formation of near-monodisperse polymers confirmed by characterization.
  • MS/MS sequencing of informational oligocarbamates revealed orthogonal fragmentation of urethane motifs.

Conclusions:

  • A robust method for synthesizing sequence-defined oligocarbamates has been established.
  • The developed approach enables precise control over polymer sequence and linkage type.
  • Orthogonal fragmentation of urethane linkages in these macromolecules provides a valuable tool for structural elucidation.