| Due to its large surface area and ordered hexagonal pore structure, MCM-41mesoporous can interact with atoms, ions, molecules and nano-particles throughits surface and bulk of the molecular sieves, which endows MCM-41improvedphysical and chemical properties. Lots of researches have been done on theapplication of MCM-41in catalysis and adsorption areas.MCM-41sieves have been prepared by hydrothermal method under alkalinecondition using cetyl trimethyl ammonium bromide (CTAB) as template,tetraethylorthosilicate (TEOS) as silicon source. Fe2O3and NiO were introducedto MCM-41and the improvement of catalytic performance has been studied.MCM-41sieves and modified MCM-41sieves were characterized by X-raydiffraction (XRD), scanning electron microscopy (SEM) and transmissionelectron microscopy (TEM). Polyethylene (PE)/mesoporous composites weresynthesized by solution method and melting method. The thermal degradationbehavior and combustion properties of composites were investigated by thermalgravimetric analysis (TG) and cone calorimeter (Cone). Moreover, MCM-41mesoporous associated with ammonium polyphosphate (APP) and pentaerythritol(PER) were added to PE as intumescent flame retardant, and the synergisticeffect was investigated.The results indicate that MCM-41mesoporous molecular sieves with poresize of3.8nm were successfully prepared by hydrothermal method. Fe2O3andNiO modified MCM-41were achieve, which induced the decrease of long-rangeorder of MCM-41. MCM-41molecular sieve reduced the thermal degradationrate and heat release rate of PE/MCM-41composites during combustion, and the char residue has been improved. MCM-41molecular sieve and intumescent flameretardant reduces thermal degradation rate and heat release rate combustion ofPE/IFR/MCM-41composites, the total heat release of combustion has also beenreduced. MCM-41and IFR have synergistic char-formation effect in PE asintumescent flame retardant, which improved of flame retardant efficiency. |
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