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UV-absorbent lignin-based multi-arm star thermoplastic elastomers.

Juan Yu1, Jifu Wang, Chunpeng Wang

  • 1Institute of Chemical Industry of Forestry Products, CAF; National Engineering Laboratory for Biomass Chemical Utilization, Key and Laboratory on Forest Chemical Engineering, SFA; Key Laboratory of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China; Institute of Forest New Technology, CAF, Beijing, 100091, China.

Macromolecular Rapid Communications
|December 30, 2014
PubMed
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Sustainable thermoplastic elastomers were created by grafting lignin onto polymers. These lignin-grafted copolymers show improved mechanical properties and potential for UV-blocking coatings.

Keywords:
UV absorptionligninstar polymerthermoplastic elastomer

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Materials

Background:

  • Lignin, a renewable biopolymer, is an abundant source for developing sustainable materials.
  • Grafting polymers onto lignin can enhance its properties and create novel functional materials.

Purpose of the Study:

  • To synthesize lignin-grafted copolymers using atom transfer radical polymerization (ATRP).
  • To evaluate these copolymers as sustainable thermoplastic elastomers (TPEs).
  • To investigate the effect of monomer ratios on copolymer properties and UV absorption.

Main Methods:

  • Synthesis of lignin-based macroinitiators.
  • "Grafting from" ATRP to create lignin-graft-poly(methyl methacrylate-co-butyl acrylate) (lignin-g-P(MMA-co-BA)).
  • Tuning glass transition temperatures by adjusting monomer feed ratios (MMA/BA).
  • Mechanical property testing and UV absorption analysis.

Main Results:

  • Tunable glass transition temperatures ranging from -10 to 40 °C were achieved.
  • Lignin-g-P(MMA-co-BA) copolymers demonstrated significantly improved mechanical properties compared to linear counterparts.
  • An elastic strain recovery of nearly 70% was observed.
  • High UV absorption in the UV spectrum was detected.

Conclusions:

  • Lignin-g-P(MMA-co-BA) copolymers are promising sustainable thermoplastic elastomers with enhanced mechanical performance.
  • The tunable nature of these copolymers allows for tailored applications.
  • Their UV absorption properties suggest potential use in UV-blocking coatings.