Facile and scalable fabrication of bioderived flame retardant based on adenine for enhancing fire safety of fully biodegradable PLA/PBAT/TPS ternary blends. Issue 35 (16th April 2021)

• Record Type: Journal Article
• Authors: Qi, Juan; Pan, Yingtong; Luo, Zhonglin; Wang, Biaobing
• Is Part Of: Journal of applied polymer science. Volume 138:Issue 35(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-04-16
• Subjects: adenine -- amino trimethylene phosphoric acid -- bio‐based flame retardant -- PLA/PBAT/TPS ternary blends -- structure–property relationships; Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.50877
• Languages: English
• ISSNs: 0021-8995

Abstract

Abstract: The facile fabrication of a bioderived flame retardant (marked as ATMP‐A) via ionic exchange between adenine and amino trimethylene phosphonic acid was reported in the present work. The incorporation of ATMP‐A endows the poly lactic acid (PLA)/poly butylene adipate‐co‐terephthalate (PBAT)/thermoplastic starch (TPS) ternary blends with improved fire safety without negatively affecting the biodegradability. The PLA/PBAT/TPS blend containing 18 wt% ATMP‐A alone achieves a UL‐94 V‐0 rating with a higher LOI value (28%). Meanwhile, its peak of the heat release rate and total heat release are reduced by 60.5% and 34.1% as compared with the PLA/PBAT/TPS ternary blend, respectively. Such excellent flame retardancy is mainly attributed to the formation of the intumescent flame retardant system in which ATMP‐A acts as both acid and gas sources together with TPS as a natural carbon source. Based on the analysis of the volatile gases and the char residues, a possible flame retardant mechanism including gas phase and condensed phase is proposed. This work provides a novel and effective idea for improving the fireproof performance of PLA/PBAT/TPS blends and will broaden its practical application fields, such as, agricultural film and packaging fields. Abstract : This article provides a flame retardant scheme for PLA/PBAT/TPS biodegradable ternary blends. A bio‐based flame retardant (marked as ATMP‐A) via ionic exchange between adenine and amino trimethylene phosphonic acid was synthesized. During the combustion process, ATMP‐A and TPS formed an intumescent flame retardant system, and an expanded and dense carbon layer was formed on the surface of the flame retardant blends, which acted as a barrier between external environment and polymer matrix. Above all, ATMP‐A not only endows PLA/PBAT/TPS with excellent fire safety but also its bio‐based property is in line with the biodegradability.