Issue 8, 2018

Synthesis of a novel polyphosphate and its application with APP in flame retardant PLA

Abstract

To improve the flame resistance of PLA, a novel phosphorus-containing flame retardant (PFRS) was synthesized via the A2 + B3 type reaction of bisphenolic acid-based monomer (DPM, A2) and phosphorus oxychloride (POCl3, B3). Flame retardant PLA composite containing 15 wt% PFRS could achieve an LOI value of 24.3%, as well as a UL-94 V2 rating. Based on the structure of PFRS, here, intumescent flame retardant (IFR) systems were prepared by combining PFRS with ammonium polyphosphate (APP). The resultant PLA/PFRS/APP samples showed excellent fire-resistance properties such as self-extinguishing behavior and extremely low heat release rates. The LOI value of PLA composite with the addition of 3.8 wt% PFRS and 11.2 wt% APP could reach 29.7% and pass UL-94 V0 rating, and the PHRR value decreased by 46% compared to pure PLA. Investigation of the morphologies of the charred residues by Scanning Electron Microscopy (SEM) and Raman spectroscopy revealed the intrinsic charring ability of IFR systems to form a heat-protective intumescent-like barrier on the surface of PLA.

Graphical abstract: Synthesis of a novel polyphosphate and its application with APP in flame retardant PLA

Supplementary files

Article information

Article type
Paper
Submitted
19 Nov 2017
Accepted
17 Jan 2018
First published
24 Jan 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 4483-4493

Synthesis of a novel polyphosphate and its application with APP in flame retardant PLA

T. Liu, J. Jing, Y. Zhang and Z. Fang, RSC Adv., 2018, 8, 4483 DOI: 10.1039/C7RA12582H

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