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Crosslinked polyethylene/organic montmorillonite (XLPE/OMMT) nanocomposites were prepared by melting blending method. The performance of samples before and after thermal ageing were characterized by small angle X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), Fourier transform infrared spectra (FTIR), and mechanical properties test. The results show that with the mass fraction of 0.5%, OMMT can be well dispersed in the matrix before ageing. However, OMMT agglomerates when the filler doping amount increases. There are only a few chemical bonds between OMMT and XLPE matrix, they mainly coexist in the form of physical entanglement. The crystallinity of nanocomposites decreases due to the space steric effect of OMMT lamella. After ageing, the layer spacing of XLPE/OMMT-0.5% samples decreases and the crystallinity increases. With the increase of OMMT doping amount, the interlayer spacing of OMMT increases due to the breakdown of XLPE molecular chain and the thermal rearrangement of OMMT in matrix. Due to thermal ageing, the completeness of crystal structure of nanocomposites gets worse, the crystal size distribution becomes wider, and the crystallinity decreases significantly. The molecular chain structure of nanocomposites is seriously damaged by thermal oxidation and thermal cracking. The mechanical property of XLPE/OMMT-0.5% decreases slightly after ageing, and when the content of OMMT exceeds 0.5%, the mechanical properties of nanocomposites decrease seriously. And the samples become brittle and hard.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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