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One-Pot, Solvent- and Catalyst-Free Synthesis of Polyphosphoramide as an Eco-Benign and Effective Flame Retardant for Poly(lactic acid)
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-10-19 , DOI: 10.1021/acssuschemeng.0c05931
Jiabing Feng 1, 2 , Xiaodong Xu 3 , Zhiguang Xu 2 , Hongyan Xie 2 , Pingan Song 1 , Lujuan Li 1, 2 , Guobo Huang 4 , Hao Wang 1
Affiliation  

Despite many merits, biobased and biodegradable poly(lactic acid) (PLA) suffers from inherently high flammability, significantly impeding its practical applications in the areas of packaging, fibers, electric and electronics, etc. Phosphoramides-based flame retardants have demonstrated exceptional flame retardancy in PLA only at very low loading levels. Unfortunately, exiting synthetic processes of phosphoramides often involve the use of a huge amount of organic solvents, presenting a potential threat to the ecosystem and human beings, in addition to high production costs. Herein, we report a one-pot, solvent- and catalyst-free, and green approach for the synthesis of a polyphosphoramide (DM-H) via two-step polycondensation between dimethyl methylphosphonate (DMMP) and 1,6-hexanediamine (HDA). As-synthesized DM-H exhibits exceptional flame-retardant efficiency in the PLA while preserving the mechanical properties of the PLA. The addition of only 2 wt % DM-H enables the PLA to achieve a desirable V-0 rating during vertical burning tests and a high limited oxygen index (LOI) value of 29.7%, because the DM-H can act both in the gas and condensed phases. Moreover, the tensile strength is of 59.7 MPa comparable to 62.1 MPa of the bulk PLA. This work offers an innovative and green approach for the synthesis of polyphosphoramides to create high-performance sustainable PLA materials with balanced flame retardancy and mechanical performances.

中文翻译:

一锅,无溶剂和无催化剂的聚磷酰胺合成物,对聚乳酸具有生态友好性和有效的阻燃性

尽管有许多优点,但是生物基和可生物降解的聚乳酸(PLA)固有地具有高易燃性,从而极大地阻碍了其在包装,纤维,电气和电子等领域的实际应用。基于磷酰胺的阻燃剂已显示出卓越的阻燃性在PLA中仅在非常低的负载水平下使用。不幸的是,退出磷酰胺的合成过程通常涉及使用大量有机溶剂,除了生产成本高外,还对生态系统和人类构成潜在威胁。本文中,我们报告了一种通过一锅法,无溶剂和无催化剂的绿色方法,通过甲基膦酸二甲酯(DMMP)和1,6-己二胺(HDA)之间的两步缩聚反应来合成聚磷酰胺(DM-H) 。合成后的DM-H在PLA中表现出出色的阻燃效率,同时保留了PLA的机械性能。仅添加2 wt%的DM-H,可使PLA在垂直燃烧测试中达到理想的V-0等级,并获得29.7%的高极限氧指数(LOI)值,因为DM-H可以同时在气体中起作用和浓缩阶段。此外,抗张强度为59.7 MPa,可与本体PLA的62.1 MPa相媲美。这项工作为聚磷酰胺的合成提供了一种创新的绿色方法,以创建具有平衡阻燃性和机械性能的高性能可持续性PLA材料。仅添加2 wt%的DM-H,可使PLA在垂直燃烧测试中达到理想的V-0等级,并获得29.7%的高极限氧指数(LOI)值,因为DM-H可以同时在气体中起作用和浓缩阶段。此外,抗张强度为59.7 MPa,可与本体PLA的62.1 MPa相媲美。这项工作为聚磷酰胺的合成提供了一种创新的绿色方法,以创建具有平衡阻燃性和机械性能的高性能可持续性PLA材料。仅添加2 wt%的DM-H,可使PLA在垂直燃烧测试中达到理想的V-0等级,并获得29.7%的高极限氧指数(LOI)值,因为DM-H可以同时在气体中起作用和浓缩阶段。此外,抗张强度为59.7 MPa,可与本体PLA的62.1 MPa相媲美。这项工作为聚磷酰胺的合成提供了一种创新的绿色方法,以创建具有平衡阻燃性和机械性能的高性能可持续性PLA材料。
更新日期:2020-11-09
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