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For the issue of PMMA toughened material which easily produces mold fouling and affects the manufacturing of automotive lighting, this paper proposes a mold fouling collection device which can be used to observe the precipitation of the mold fouling at different shear rates and examine composition of mold fouling by the method of Py-GCMS. In addition, 2 toughened PMMA materials are selected to study the influence of the material characteristics on the mold fouling by differential scanning calorimetry and thermogravimetric analysis. The results show that from a technological point of view the higher the shear rate due to shear heating, the higher the temperature, the more the mold fouling precipitates are produced; from the perspective of the material formulation, the lower the glass transition temperature, the lower the temperature rise under the same shear, the less the mold fouling is produced.
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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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