Synthesis of a Novel Flame Retardant and Its Synergistic Effect With a Phosphapheanthrene Flame Retardant in Polypropylene/Polyethylene Vinyl Acetate Blends. Issue 1 (2nd January 2018)

• Record Type: Journal Article
• Authors: Ren, Qinglong; Xia, Ying; Zhang, Xinyue; Zhang, Fengfeng; Guo, Jing; Zhang, Sen
• Is Part Of: Journal of macromolecular science. Volume 57:Issue 1(2018)
• Page Start: 31
• Page End: 43
• Publication Date: 2018-01-02
• Subjects: Flame retardant -- PP/EVA -- Synergistic effect -- Synthesis -- Thermal stability; Polymerization -- Periodicals; Polymers -- Periodicals; 530.413
• DOI: 10.1080/00222348.2017.1411075
• Languages: English
• ISSNs: 0022-2348

Abstract

ABSTRACT: A novel flame retardant (NSiB) containing nitrogen, silicon and boron was synthesized through reacting of N -(β-aminoethyl)-γ-aminopropyl trimethoxy-silane (KH-792) and boric acid. The structure of NSiB was characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy with energy dispersive spectrometry (SEM-EDS). The effects of NSiB on the flame retardancy and thermal behaviors of polypropylene (PP)/polyethylene vinyl acetate (EVA) blends were investigated by limiting oxygen index value (LOI), vertical burning tests (UL-94) and thermal gravimetric analysis tests (TGA). The results showed that the flame retardancy and thermal stability of PP/EVA blends were improved with the addition of NSiB. When 7.5 wt% DOPO (phosphaphenanthrene) and 0.5 wt% NSiB were incorporated, the LOI value of the PP/EVA blends was 26.9%, and the class V-0 of UL-94 test was passed, as compared to the LOI value of 22.4% and class V-2 of UL-94 test for 8.0 wt% DOPO only and 16.7% and fail, respectively, for the PP/EVA blends alone. The char structure observed by SEM indicated that the surface of the char for the PP/EVA/7.5 wt% DOPO/0.5 wt% NSiB blends had a denser and continuous char structure when compared with that of the PP/EVA blends and PP/EVA/8.0 wt% DOPO blends. These results indicated that there was a good synergistic effect for NSiB and DOPO.