Grafting Lignin with Bioderived Polyacrylates for Low-Cost, Ductile, and Fully Biobased Poly(lactic acid) Composite

Sun, Yiqi and Ma, Zhewen and Xu, Xiaodong and Liu, Xiaohuan and Liu, Lina and Huang, Guobo and Liu, Lei and Wang, Hao and Song, Pingan ORCID: https://orcid.org/0000-0003-1082-652X (2020) Grafting Lignin with Bioderived Polyacrylates for Low-Cost, Ductile, and Fully Biobased Poly(lactic acid) Composite. ACS Sustainable Chemistry & Engineering, 8 (5). pp. 2267-2276. ISSN 2168-0485


Abstract

It has been always attractive to design low-cost, ductile, and fully biobased polylactic acid (PLA) composites based on industrial waste lignin for promoting its practical applications in the industry. Unfortunately, existing material strategies often lead to poor processability and low ductility because of weak interfaces between lignin and PLA. Herein, we report a fully biobased functionalized lignin (Lig-g-P(LMA-co-THFMA, or Mlignin) by chemically grafting two bioderived monomers, lauryl methacrylate (LMA), and tetrahydrofurfuryl methacrylate (THFMA) via free-radical polymerization. Mlignin exhibits moderately lower melt viscosity and improved formability with PLA as compared with pristine lignin due to better interfacial combability. Because of improved interfacial adhesion, Mlignin is capable of uniformly dispersing within the PLA matrix in a submicron phase size, leading to a “sea-island” structure. As a result, the addition of 20 wt % Mlignin increases the ductility by 16 folds (from 12 to 204%) and the toughness by ∼11 folds from 4.4 to 54.6 MJ m–3 relative to the PLA matrix. Meanwhile, the PLA/20% Mlignin composite retains a tensile strength of 40.9 MPa. Such largely enhanced ductility and toughness of PLA is mainly attributed to the deformation of Mlignin that can dissipate the fracture energy during the tension process. This work not only offers a simple route to converting industrial waste lignin into value-added biobased fillers for polymers and but also provides a new approach for developing low-cost, ductile, and fully sustainable PLA to further its industrial applications.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 29 Jan 2021 01:30
Last Modified: 31 Jan 2021 23:01
Uncontrolled Keywords: poly(lactic acid); lignin; chemical graft; toughness; ductility
Fields of Research (2008): 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030306 Synthesis of Materials
09 Engineering > 0912 Materials Engineering > 091209 Polymers and Plastics
09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials
40 ENGINEERING > 4016 Materials engineering > 401609 Polymers and plastics
40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280105 Expanding knowledge in the chemical sciences
28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering
28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280111 Expanding knowledge in the environmental sciences
Identification Number or DOI: https://doi.org/10.1021/acssuschemeng.9b06593
URI: http://eprints.usq.edu.au/id/eprint/40959

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