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This study aims to clarify the effects of the crystallization characteristics of domestically washed polypropylene resin and the casting process on the microstructure of cast films and the comprehensive properties of biaxially oriented polypropylene (BOPP) films. Using domestically washed polypropylene resin as the research object, the effects of crystallization characteristics of the domestic resin and casting process on the regulation of the cast film microstructure and the resulting effects on the comprehensive properties of BOPP films were systematically investigated by means of characterization techniques such as polarizing optical microscopy (POM) and wide-angle X-ray diffractometry (WAXD). The results show that the domestic resin can form β-crystals of relatively small size during slow cooling. Increasing the chill roll temperature can increase the crystallinity, β-crystal content, and spherulite size of the cast film, while the β-crystals on the cast film surface directly influence the size and distribution morphology of the crater rings on the surface of the domestic BOPP film. The comprehensive properties of the domestic BOPP film have approached those of imported products of the same specification.
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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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