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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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Lignin-Based Polyurethanes from the Blocked Isocyanate Approach: Synthesis and Characterization.

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This study demonstrates a novel method for creating lignin-based polyurethanes (LPUs) using a blocked isocyanate approach. This technique successfully produced LPU prepolymers with potential as effective monocomponent adhesives.

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Area of Science:

  • Polymer Chemistry
  • Biomaterials Science

Background:

  • Lignin, a renewable biopolymer, is abundant and rich in hydroxyl groups, making it a promising precursor for polyurethanes.
  • Traditional synthesis of lignin-based polyurethanes (LPUs) involves reacting lignin with diisocyanates.

Purpose of the Study:

  • To explore the feasibility of using a blocked isocyanate approach for LPU synthesis.
  • To investigate the prepolymerization kinetics and structure of LPUs derived from unmodified and hydroxypropylated Kraft lignins.
  • To evaluate the potential of these LPUs as adhesives.

Main Methods:

  • LPUs were synthesized using unmodified and hydroxypropylated Kraft lignins with 4,4'-methylene diphenyl diisocyanate and diisopropylamine (blocking agent).
  • Castor oil was used as a co-polyol.
  • Chemical modification and structure were analyzed using 31P nuclear magnetic resonance (31P NMR) and bidimensional NMR.
  • Prepolymerization kinetics were studied using temperature-modulated optical refractometry and Fourier-transform infrared spectroscopy.
  • Lap shear tests were conducted to assess adhesive properties.

Main Results:

  • Hydroxypropylation enhanced the reactivity of Kraft lignin.
  • The formation of hindered urea-terminated LPU prepolymers was confirmed.
  • The blocked isocyanate approach proved feasible for LPU production.
  • LPU prepolymers showed potential as monocomponent adhesives.

Conclusions:

  • The blocked isocyanate method is a viable route for synthesizing LPUs from Kraft lignin.
  • Modified lignin (hydroxypropylated) exhibits improved reactivity.
  • The resulting LPU prepolymers demonstrate promise for adhesive applications.