4.7 Article

A novel polymeric intumescent flame retardant: Synthesis, thermal degradation mechanism and application in ABS copolymer

Journal

POLYMER DEGRADATION AND STABILITY
Volume 97, Issue 9, Pages 1772-1778

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2012.06.009

Keywords

Synthesis; Characterization; Synergistic flame retardancy; Charring flame retardant mechanism; TG-IR

Funding

  1. National Natural Science Foundation of China [50973091]

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A novel polymeric intumescent flame retardant containing phosphorous-nitrogen (PSPTR) was synthesized and characterized by FTIR, H-1 NMR and P-31 NMR. Moreover, a new intumescent flame retardant (IFR) system, which was composed of PSPTR and Phenol Formaldehyde Resin (PF), was used to impart flame retardancy for ABS. Flammability properties of ABS/IFR composites were investigated by Limiting oxygen Index (LOI) and vertical burning test (UL-94), respectively. The results showed that when the total addition content was 30 wt%, the weight ratio of PSPTR to PF is 1:1, the LOI value of ABS/IFR reached 28.2, and UL-94 reached V-1 rating. A distinct synergistic flame retardant effect exists between PSPTR and PF. The TGA data showed that the IFR (PSPTR/PF = 1:1, wt%) had three weight-loss stages and had a high residue of 50.21 wt% at 700 degrees C. The thermal degradation process of PSPTR and char-forming mechanism of IFR was studied by thermogravimetric analysis/infrared spectrometry (TG-IR) detailedly. (c) 2012 Elsevier Ltd. All rights reserved.

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