A comparison of thermal degradation kinetic mechanisms between elongational and shearing flow fields for nano-silica/IFR synergistic fire retardant polypropylene nanocomposites

Autor: Zheng-Huan Wu, Jun-Xin Guo, Qi-Xiang Fan, Quan Wang, Yu-Jun Cai, Yong-Qing Zhao
Rok vydání: 2019
Předmět:
Zdroj: Materials Express. 9:1033-1042
ISSN: 2158-5849
DOI: 10.1166/mex.2019.1607
Popis: In this work, the same formulations of Nano-Silica/intumescent fire retardant polypropylene nanocomposites were prepared via a novel vane extruder and a tri-screw extruder, which represented elongational flow field and shearing flow field, respectively. Not only the synergistic combustion mechanisms of Kissinger method and Flynn-Wall-Ozawa method were revealed, but also the combustion effect and efficiency were compared. Both two methods proved specimens that processed by TE exhibited higher thermal stability. The smaller aggregates of physical initial Nano-Silica, the better dispersivity of aggregates in specimens that processed by VE. Such property broke the compactness degree of char layer.
Databáze: OpenAIRE