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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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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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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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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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Quantitative 31P NMR Analysis of Lignins and Tannins
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Polyurethanes Based on Unmodified and Refined Technical Lignins: Correlation between Molecular Structure and Material

Yun-Yan Wang1, Brent Scheidemantle2,3, Charles E Wyman2,3,4

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Researchers developed new lignin-based polyurethanes by tailoring lignin structure and adding secondary hydroxyl providers. This improves lignin dispersion and enhances material properties for advanced applications.

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Area of Science:

  • Polymer Science and Engineering
  • Biomass Valorization
  • Sustainable Materials

Background:

  • Technical lignin's complex structure and interactions hinder its use in value-added polymers.
  • Understanding the link between lignin's molecular features and polyurethane properties is crucial for material development.

Purpose of the Study:

  • To investigate the structure-property relationships in lignin-based polyurethanes.
  • To produce tailored lignin preparations for improved polymer incorporation.
  • To explore the role of secondary hydroxyl group providers in modifying polyurethane characteristics.

Main Methods:

  • Co-solvent enhanced lignocellulosic fractionation and sequential precipitation were used to obtain low molecular weight lignin.
  • Three distinct lignin preparations with controlled molecular weight dispersity (<2) and low molecular weight (<1500 g/mol) were produced from poplar biomass.
  • Aliphatic diols and polyethers were incorporated as co-monomers in polyurethane synthesis.

Main Results:

  • Lignin preparations varied in molecular chain length, stiffness, and hydroxyl group distribution.
  • Secondary hydroxyl providers enhanced lignin dispersion within the polyurethane network through varying interaction strengths.
  • The choice of hydroxyl provider significantly impacted the mechanical and thermal properties of the resulting polyurethanes.

Conclusions:

  • Tailoring technical lignin structure and incorporating specific secondary hydroxyl providers are effective strategies for developing advanced lignin-based polyurethanes.
  • This approach offers new pathways for formulating functional lignin-containing polymers for diverse applications.
  • Controlled lignin fractionation and copolymerization enable enhanced material performance.