Polyphosphoramides as Highly Effective Fire Retardants for Polylactide: Green Syntheses, Properties and Mechanisms
PhD by Publication
Title | Polyphosphoramides as Highly Effective Fire Retardants for Polylactide: Green Syntheses, Properties and Mechanisms |
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Type | PhD by Publication |
Authors | |
Author | Feng, Jingbing |
Supervisor | |
1. First | Prof Pingan Song |
2. Second | Prof Hao Wang |
Institution of Origin | University of Southern Queensland |
Qualification Name | Doctor of Philosophy |
Number of Pages | 120 |
Year | 2022 |
Publisher | University of Southern Queensland |
Place of Publication | Australia |
Digital Object Identifier (DOI) | https://doi.org/10.26192/q7q88 |
Abstract | Renewable Polylactide (PLA) suffers from a high flammability that limits in its practical applications in many industrial settings. Therefore, it is imperative to develop flame-retarding PLA. Polyphosphoramides have shown a high fire-resistant efficiency in PLA, but nearly all of their existing synthesis methods involve a large volume of toxic solvents. Meanwhile, there has been a lack of in-depth understanding of their modes of actions and how they affect comprehensive properties of PLA. For these reasons, this thesis focuses on developing solvent/catalyst-free synthesis approaches for polyphosphoramides, then unveiling their modes of actions, and then investigating how the physical properties of PLA are impacted by polyphosphoramides. We pioneered developed a green strategy to synthesize three types of polyphosphoramides fire retardants (DM-H, DM-Si and DM-OHn) without use of any solvents and catalysts. DM-H and DM-Si show very high fire-retardant efficiency in PLA, only 2 and 3 wt%, respectively, enable PLA to achieve a desired UL-94 V-0 rating and a high LOI, but reduce its thermal stability. In comparison, DM-OHn makes PLA show both desired flame retardancy and enhanced thermal stability. The polyphosphoramides fire retardants mainly function in the gas phase. Moreover, they have limited impact on the mechanical strength of PLA. This work provides one new eco-benign strategy for synthesizing polyphosphoramides fire retardants and the results and findings of this work will significantly promote the green development of next-generation eco-friendly effective fire retardants and fire-retardant PLA bioplastics, thus enabling PLA to find more applications in industries. |
Keywords | Polylactide, Polyphosphoramides, Fire retardants, Green synthesis, Modes of actions, Physical properties |
Related Output | |
Has part | One-Pot, Solvent- and Catalyst-Free Synthesis of Polyphosphoramide as an Eco-Benign and Effective Flame Retardant for Poly(lactic acid) |
Has part | A Si-containing polyphosphoramide via green chemistry for fire-retardant polylactide with well-preserved mechanical and transparent properties |
Has part | Solvent-Free Synthesis of Organic−Inorganic Polyphosphoramide-Halloysite Nanohybrids for Thermally Stable and Fire-Resistant Polylactide |
ANZSRC Field of Research 2020 | 401609. Polymers and plastics |
401602. Composite and hybrid materials | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | School of Agriculture and Environmental Science |
https://research.usq.edu.au/item/q7q88/polyphosphoramides-as-highly-effective-fire-retardants-for-polylactide-green-syntheses-properties-and-mechanisms
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