Core–Shell Bioderived Flame Retardants Based on Chitosan/Alginate Coated Ammonia Polyphosphate for Enhancing Flame Retardancy of Polylactic Acid
Article
Zhang, Yan, Xiong, Zhengquan, Ge, Haodong, Ni, Leikun, Zhang, Tao, Huo, Siqi, Song, Pingan and Fang, Zhengping. 2020. "Core–Shell Bioderived Flame Retardants Based on Chitosan/Alginate Coated Ammonia Polyphosphate for Enhancing Flame Retardancy of Polylactic Acid." ACS Sustainable Chemistry and Engineering. 8 (16), pp. 6402-6412. https://doi.org/10.1021/acssuschemeng.0c00634
| Article Title | Core–Shell Bioderived Flame Retardants Based on Chitosan/Alginate Coated Ammonia Polyphosphate for Enhancing Flame Retardancy of Polylactic Acid |
|---|---|
| ERA Journal ID | 200101 |
| Article Category | Article |
| Authors | Zhang, Yan (Author), Xiong, Zhengquan (Author), Ge, Haodong (Author), Ni, Leikun (Author), Zhang, Tao (Author), Huo, Siqi (Author), Song, Pingan (Author) and Fang, Zhengping (Author) |
| Journal Title | ACS Sustainable Chemistry and Engineering |
| Journal Citation | 8 (16), pp. 6402-6412 |
| Number of Pages | 11 |
| Year | 2020 |
| Publisher | American Chemical Society |
| Place of Publication | United States |
| ISSN | 2168-0485 |
| Digital Object Identifier (DOI) | https://doi.org/10.1021/acssuschemeng.0c00634 |
| Web Address (URL) | https://pubs.acs.org/doi/abs/10.1021/acssuschemeng.0c00634 |
| Abstract | Bioderived flame retardants represent one class of the most promising sustainable additives for creating flame retardant polylactic acid (PLA) because of their marginal impact on the biodegradability of PLA. Ammonium polyphosphate (APP) has demonstrated high flame-retardant effectiveness in PLA but its flame-retardant efficiency remains unsatisfactory even if after modifications. Herein, we report the facile fabrication of core–shell bioderived flame retardants by using APP as the core, and the chitosan (CS)/alginate (AA) bilayer as the shell through self-assembly in aqueous solution. The resultant core–shell flame retardant, APP@CS@AA-nBL (where 'BL' is a CS&AA bilayer and 'n' denotes 1–3 BL), can endow PLA with improved flame retardancy without negatively affecting the thermal properties. The PLA containing 10 wt % APP@CS@AA-3BL shows the highest LOI value (30.6%) and achieves a UL94 V-0 rating in the vertical burning test. Meanwhile, the cone calorimetry results demonstrate that the peak of the heat release rate and total heat release are respectively decreased by 23% and 11% relative to the PLA bulk. Such enhanced flame retardancy is mainly due to the excellent char-forming capability of APP@CS@AA. Moreover, the inclusion of 10 wt % APP@CS@AA-3BL gives rise to ∼23% increase in the impact strength of PLA possibly because of their interfacial hydrogen-bonding interactions. This work provides a facile and green strategy for preparing highly effective bioderived flame retardants for PLA and thus is expected to expand the practical applications in industry. |
| Keywords | Polylactic acid; Biobased flame retardant; Core−shell; Chitosan; Alginate |
| Contains Sensitive Content | Does not contain sensitive content |
| ANZSRC Field of Research 2020 | 401605. Functional materials |
| 401609. Polymers and plastics | |
| 401602. Composite and hybrid materials | |
| Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
| Byline Affiliations | Zhejiang University, China |
| Zhejiang Sci-Tech University, China | |
| Centre for Future Materials | |
| Institution of Origin | University of Southern Queensland |
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