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<p>Valorization of waste for chemical processes addresses a challenging task for the society. Soda lignin (<b>AL</b>) available in the pulp industry operated in a photocatalytic cycle CuX<sub>2</sub>/<b>L</b> (X: Br, Cl; <b>L</b>: Me<sub>6</sub>TREN: Tris[2-(dimethylamino)ethyl]amine) and to initiate radical photopolymerization of methyl methacrylate (MMA) with α-bromophenylacetate (EBPA) by exposure at 420 nm. This resulted in poly(methyl methacrylate) (PMMA<b>)</b> exhibiting a dispersity &lt;1.3 with CuX<sub>2</sub>/L loading of ≲52 ppm. Deactivator reduction increased dispersity. MMA, styrene, and benzyl methacrylate successfully served as monomers for chain extension and block copolymerization experiments. This worked with CuX<sub>2</sub>/L ≥ 6.5 ppm, although conventional radical polymerization additionally competed. Adding of sodium pyruvate enabled radical photopolymerization under air. Modification of lignin with an aryl sulfonate group resulted in a one-component photoinitiator. It successfully initiated radical photopolymerization of a monomer mixture of (hydroxyethyl)methacrylate (HEMA) and urethane dimethacrylate (UDMA). Scale-up experiments approved practicability of photo-ATRP.</p><p></p>

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Soda lignin as a sustainable photosensitive component for conventional and controlled radical photopolymerization

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月5日

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  • Min Wang,
  • Xiongfei Luo,
  • Qunying Wang,
  • Veronika Strehmel,
  • Zhijun Chen,
  • Shujun Li,
  • Bernd Strehmel

摘要

Valorization of waste for chemical processes addresses a challenging task for the society. Soda lignin (AL) available in the pulp industry operated in a photocatalytic cycle CuX2/L (X: Br, Cl; L: Me6TREN: Tris[2-(dimethylamino)ethyl]amine) and to initiate radical photopolymerization of methyl methacrylate (MMA) with α-bromophenylacetate (EBPA) by exposure at 420 nm. This resulted in poly(methyl methacrylate) (PMMA) exhibiting a dispersity <1.3 with CuX2/L loading of ≲52 ppm. Deactivator reduction increased dispersity. MMA, styrene, and benzyl methacrylate successfully served as monomers for chain extension and block copolymerization experiments. This worked with CuX2/L ≥ 6.5 ppm, although conventional radical polymerization additionally competed. Adding of sodium pyruvate enabled radical photopolymerization under air. Modification of lignin with an aryl sulfonate group resulted in a one-component photoinitiator. It successfully initiated radical photopolymerization of a monomer mixture of (hydroxyethyl)methacrylate (HEMA) and urethane dimethacrylate (UDMA). Scale-up experiments approved practicability of photo-ATRP.