| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 672671 | Thermochimica Acta | 2016 | 8 Pages |
•Polyoxo-metalates based ionic liquids (PILs) were modified by different alkyl groups.•Shorter alkyl group are better for flame retardancy of PP composites than longer one.•PP compoaites with shorter alkyl group has poorer mechanical properties than longer one.•Properties of PP composites can be tailored by alkyl groups in cation of PILs.
The structure-property relationship of a series of polyoxo-metalates based ionic liquids (PILs) modified polypropylene (PP)/Intumescent flame retardant (IFR) composites were studied. The results showed that the chemical structure of PILs has a great effect on properties of PP composites. The flame retardancy of PP/IFR/PILs composites with a shorter alkyl group are better than that with a longer alkyl group. The PP/IFR/PIL composite with 0.5 wt% PIL with 1-butyl-3-methyl imidazole and 14.5% IFR gets the UL-94 V-0, but achieving the same UL-94 grade needs no less than 19.5 wt% IFR and 0.5 wt% PIL with 1-octyl-3-methyl imidazole. In addition, PILs modified by different groups have great effects on the mechanical properties, the PP/IFR/PIL composites containing 1-dodecyl-3-methyl imidazole obtain the best notch impact strength. The results show that the flame retardant and mechanical properties of PP/IFR/PILs composites can be tailored by changing the cation structure of PIL.
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