文献类型：期刊文献

英文题名：Flame retardant efficiency of modified para-aramid fiber synergizing with ammonium polyphosphate on PP/EPDM

作者：Wu, Kai[1];Wang, Xiangyu[1];Xu, Yuhan[1];Guo, Weihong[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Polymer Proc Lab, Minist Educ,Key Lab Preparat & Applicat Ultrafine, Shanghai 200237, Peoples R China

年份：2020

卷号：172

外文期刊名：POLYMER DEGRADATION AND STABILITY

收录：;EI(收录号：20200107982776);WOS:【SCI-EXPANDED(收录号:WOS:000526108100007)】；

基金：The authors sincerely acknowledge the 'Science and Technology Program (H201709)' of Suqian, Jiangsu Province.

语种：英文

外文关键词：Flame retardant; PP/EPDM; Para-aramid fiber; Ammonium polyphosphate; Modification

摘要：This paper investigates the char forming effect of para-aramid fiber and the flame-retardant efficiency of para-aramid fiber synergizing with ammonium polyphosphate on polypropylene/ethylene propylene diene monomer. Para-aramid fiber was firstly modified by phosphoric acid, and then modified by 3aminopropyltriethoxy. Para-aramid fiber and modified para-aramid fiber were characterized by fieldemission scanning electron microscope, energy-dispersive analysis and Fourier transform infrared spectroscopy. Fourier transform infrared spectroscopy illustrated that P-O groups and Si-O groups appeared on the surface of modified para-aramid fiber. The intumescent flame retardants containing para-aramid fiber/ammonium polyphosphate or modified para-aramid fiber/ammonium polyphosphate was introduced into polypropylene/ethylene propylene diene monomer. The flame-retardant efficiency of polypropylene/ethylene propylene diene monomer composites were investigated by limiting oxygen index, UL-94 vertical burning and cone calorimeter test. The polypropylene/ethylene propylene diene monomer composite containing 34.5 wt% ammonium polyphosphate and 0.5 wt% modified para-aramid fiber achieved a UL-94 V0 rating with a limiting oxygen index of 28, as well as showed a 23.6% reduction of total heat release and a 47.0% reduction of total smoke release. The thermal stability of polypropylene/ethylene propylene diene monomer composites were investigated by thermogravimetric analysis. The residual char layers of polypropylene/ethylene propylene diene monomer composites were analyzed by field-emission scanning electron microscope. The tensile and tear strength of polypropylene/ethylene propylene diene monomer composites were also tested. After 1 phr modified para-aramid fiber was added, the tensile strength and tear strength increased by 33.3% and 35.9%, respectively. The results indicated that modified para-aramid fiber/ammonium polyphosphate/polypropylene/ethylene propylene diene monomer had better flame-retardant efficiency, thermal stability, smoke suppression and mechanical properties with the synergistic effect of P, N, Si elements. (C) 2020 Elsevier Ltd. All rights reserved.