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author:

Huang, Z. (Huang, Z..) [1] | Hu, L. (Hu, L..) [2] | Hong, J. (Hong, J..) [3] | Jin, Y. (Jin, Y..) [4] | Xiong, L. (Xiong, L..) [5] | Shi, Y. (Shi, Y..) [6]

Indexed by:

Scopus

Abstract:

Polylactic acid (PLA) is recognized as a promising alternative to traditional petroleum-based plastics due to its excellent biodegradability and well-balanced mechanical properties. Nevertheless, the disadvantages of PLA such as flammability in fire, susceptibility to UV light attack, and slow natural degradation rate limit its application and recovery in high-security areas. In this work, a spherical chitosan-based additive DMPC-Al with mirror-symmetric internal structure was assembled by layer-by-layer electrostatic reactions, resulting in PLA characterized excellent comprehensive performances. When 7 wt% DMPC-Al was added into PLA, the LOI value of the composite PLA/7DMPC-Al was increased to 29.6%, and UL-94 reached V-0 grade without any molten droplets. The peak heat release rate and total heat release rate were reduced by 13.5% and 16.2%, respectively, and the carbon layer was highly self-expanding. In addition, the UPF of PLA/7DMPC-Al was increased to 34.45 from 0.45 of pure PLA, blocking most of the UV light attacks and extending the service life of PLA. Surprisingly, DMPC-Al actually improved the impact toughness of PLA by 38.5% and facilitated PLA to work continuously when drawing large curved shapes by 3D printing. More importantly, the introduction of DMPC-Al changed the sensitivity of PLA to water and provided sufficient energy for microbial growth, thus accelerating the degradation rate of PLA in the soil under abandoned buildings. This work provides a practical and feasible strategy to achieve multifunctionality of degradable plastics. © 2023 Elsevier B.V.

Keyword:

Chitosan Intumescent flame retardant Poly (lactic acid) Rapid degradation in soil Ultraviolet resistance

Community:

  • [ 1 ] [Huang Z.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
  • [ 2 ] [Hu L.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
  • [ 3 ] [Hong J.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
  • [ 4 ] [Jin Y.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
  • [ 5 ] [Xiong L.]College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
  • [ 6 ] [Shi Y.]College of Environment & Safety Engineering, Fuzhou University, Fuzhou, 350108, China

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Source :

Chemical Engineering Journal

ISSN: 1385-8947

Year: 2024

Volume: 479

1 3 . 4 0 0

JCR@2023

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 7

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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