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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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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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Polylactide-Based Nonisocyanate Polyurethanes: Preparation, Properties Evaluation and Structure Analysis.

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Summary

Researchers synthesized novel nonisocyanate polyurethanes (NIPUs) from polylactide. These advanced NIPUs exhibit enhanced mechanical and thermal properties, offering a safe and stable material for various applications.

Keywords:
mechanical propertiesnonisocyanate polyurethanespolylactidethermal properties structure

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Polymers

Background:

  • Traditional polyurethanes often rely on hazardous isocyanates.
  • Developing isocyanate-free alternatives is crucial for environmental and health safety.
  • Polylactide offers a biodegradable and renewable platform for polymer synthesis.

Purpose of the Study:

  • To synthesize and characterize novel nonisocyanate polyurethanes (NIPUs) utilizing polylactide.
  • To investigate the effect of hard segment (HS) and flexible segment (FS) content on NIPU properties.
  • To evaluate the mechanical, thermal, and chemical characteristics of the synthesized NIPUs.

Main Methods:

  • NIPUs were synthesized via condensation reaction of carbamate-modified polylactic acid (flexible segments) with oligomers (hard segments).
  • Hard segments were prepared using phenolsulfonic acid (PSA) or a mixture of PSA and hydroxynaphthalenesulfonic acid (HNSA), urea, and formaldehyde.
  • Mechanical testing (tensile strength, elongation at break), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC) were employed.

Main Results:

  • Tensile strength of NIPUs increased with higher hard segment content, peaking at a HS:FS ratio of 1:3.
  • NIPUs synthesized with PSA and HNSA demonstrated superior tensile strength compared to PSA-only NIPUs.
  • Materials showed no weight loss below 100 °C and maximum degradation temperatures up to 385 °C, confirmed by TGA.
  • FTIR confirmed the chemical structure, and DSC indicated phase transitions related to hard segment melting and crystallization.

Conclusions:

  • Successful synthesis of polylactide-based nonisocyanate polyurethanes (NIPUs) was achieved.
  • The mechanical and thermal properties of NIPUs can be tuned by adjusting the hard segment to flexible segment ratio.
  • These NIPUs offer a promising, safe alternative to conventional polyurethanes with good thermal stability.