Enhancing the strength and toughness of polylactic acid-based composites through one-step co-deposition of active coating onto wood fiber.

Int J Biol Macromol

College of Forestry, Northwest A&F University, Yangling 712100, Shaanxi, China; International Joint Research Center for Biomass Materials, Southwest Forestry University, Kunming 650224, China. Electronic address:

Published: August 2024

AI Article Synopsis

  • A new method called facial strategy of co-deposition is introduced to improve bonding between wood fiber (WF) and polylactic acid (PLA) in composites.
  • The process involves using dopamine or tannic acid (TA) alongside 3-aminopropyltriethoxysilane (APTES) to create active coatings on WF, enhancing bonding through various chemical reactions.
  • Co-depositing TA with APTES proved to be more effective, increasing the tensile strength and elongation at break of the composites by 33.4% and 185.9%, respectively, thus improving the performance of plant fiber reinforced PLA composites.

Article Abstract

A facial strategy of co-deposition is proposed to enhance the interfacial bonding in wood fiber (WF)/polylactic acid (PLA) composites. Dopamine or tannic acid (TA) was co-deposited with 3-aminopropyltriethoxysilane (APTES) onto the WF surface to create active coatings. These coatings were formed through Michael addition and Schiff base reactions and effectively attached to the WF through a combination of hydrogen and covalent bonding. Such active coatings facilitated the connection between WF and PLA through both covalent bonds and physical entanglements, thereby enhancing the interfacial interactions and compatibility between the two components. The co-deposition of TA with APTES was found to be more effective than with dopamine, leading to a dramatic improvement in the tensile strength and elongation at break of the composites by 33.4 % and 185.9 %, respectively. This work offers a facile method to prepare high performance plant fiber reinforced PLA composites, thereby broadening the potential applications of PLA.

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Source
http://dx.doi.org/10.1016/j.ijbiomac.2024.133414DOI Listing

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