期刊
POLYMER INTERNATIONAL
卷 63, 期 10, 页码 1835-1841出版社
WILEY-BLACKWELL
DOI: 10.1002/pi.4705
关键词
graphene nanoplatelets; Friedel-Crafts reaction; dispersion; thermal properties; flame retardancy
资金
- National Natural Science Foundation of China [51203137]
- Zhejiang Provincial Natural Science Foundation [LY12E03003]
Brominated flame-retarded high-density polyethylene (HDPE) composites containing graphene nanoplatelets (GNPs) were prepared via melt blending. A Lewis acid catalyst, anhydrous aluminium chloride (AlCl3), was added to initiate Friedel-Crafts reaction for promoting the dispersion of the GNPs in the polymer matrix. Transmission electron microscopy images and Raman spectroscopy revealed that the GNPs were partly unfolded and the domains became smaller in the presence of AlCl3. Limiting oxygen index and microscale combustion calorimetry showed that the incorporation of AlCl3 into HDPE reduced flammability and slowed down the heat release rate. Thermogravimetric analysis and char residue measurements proved that a uniform dispersion of GNPs was crucial for forming a continuous and compact carbon layer, thus isolating the underlying materials from flame and preventing heat transfer. Rheological and mechanical tests indicated that interfacial adhesion between polymer chains and GNPs was enhanced. (c) 2014 Society of Chemical Industry
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