A molecularly engineered bioderived polyphosphate for enhanced flame retardant, UV-blocking and mechanical properties of poly(lactic acid)

Zhang, Yan and Jing, Jian and Liu, Ting and Xi, Liangdong and Sai, Ting and Ran, Shiya and Fang, Zhengping and Huo, Siqi and Song, Pingan ORCID: https://orcid.org/0000-0003-1082-652X (2021) A molecularly engineered bioderived polyphosphate for enhanced flame retardant, UV-blocking and mechanical properties of poly(lactic acid). Chemical Engineering Journal, 411:128493. pp. 1-13. ISSN 1385-8947


Abstract

Polylactic acid (PLA) represents one of most promising bioplastics in response to the increasing global microplastics pollution issue facing the entire ecosystem. Nevertheless, PLA is inherently flammable and also prone to UV-light attack, significantly restricting its wide applications in packaging, fibers and electronics industry. Despite high effectiveness in PLA, existing polyphosphate-based flame retardants are usually synthesized mainly from non-degradable petrochemical compounds and their functions are limited to improving flame retardancy of the polymeric matrix. We, herein, report the synthesis of a novel multifunctional bioderived polyphosphate (PPD) for PLA by using plant-derived diphenolic acid as a starting material. Our results reveal that the addition of 6 wt% of PPD enables PLA to achieve a desirable UL-94V-0 rating and a high LOI value of 27.1% due to its high gas-phase activity, which means that the final PLA fully meets the demanding flame retardancy requirement in industry. Moreover, the resultant flame-retardant PLA shows a high ultraviolet protection factor (UPF) value of 403, which indicates its excellent UV protection capability. Because of the fine and uniform dispersion of PPD within the resin matrix and their strong interfacial interactions, the PLA/6% PPD shows a 31% increase in impact toughness and a slight improvement in tensile strength compared to the bulk PLA. This work provides a strategy to synthesize a multifunctional bio-based polyphosphate flame retardant, which holds great promise for extending the practical applications of PLA with excellent flame retardancy, UV-blocking and mechanical performances.


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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: 25 Nov 2021 04:37
Last Modified: 22 Dec 2021 05:50
Uncontrolled Keywords: Polylactic acid; Bioderived flame retardants; Flammability; UV protection; Toughness
Fields of Research (2008): 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030301 Chemical Characterisation of Materials
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
Socio-Economic Objectives (2020): 24 MANUFACTURING > 2406 Environmentally sustainable manufacturing activities > 240601 Development of recyclable or biodegradable componentry, packaging or materials
28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering
Identification Number or DOI: https://doi.org/10.1016/j.cej.2021.128493
URI: http://eprints.usq.edu.au/id/eprint/44046

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