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首页> 外文期刊>Journal of Applied Polymer Science >Elaboration of porosity for the alumina particle surfaces/ bimodal PP composite cast films under continuous stretching
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Elaboration of porosity for the alumina particle surfaces/ bimodal PP composite cast films under continuous stretching

机译：在连续拉伸下拟订氧化铝颗粒表面/双峰PP复合铸膜的孔隙率

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摘要

Efforts have been focused on developing an interrelationship between machine direction orientation (MDO)/material variables and the porosity of Al2O3 particulate-filled orientable PP for various applications. Composite films were prepared by cast-extrusion followed by stretching up to 100% and 200% by the MDO machine. Cavitation could occur during film stretching when the adhesion between dispersed alumina and continuous polypropylene phase failed. Composite films with modified micro-particles and also nano ones could not generate any voids. On the other hand, composite specimens of unmodified micro-alumina particles generated micro-pores in the joint between dispersed particles and polymer during the hot stretching. Beta nucleation in these films, plays an important role in the generated ductility of the specimens. Cavitation effectiveness (no. of voids) or film permeability depended on the size and amount of alumina particles, in addition to the ratio and temperature of stretching. Cavitation particles with a size range of 0.7-3 mu m, create cavities of about 3-7 mu m. Generation of voids, by drawing environmentally friendly and antimicrobial active alumina particles, can be utilized in the fabrication of sustainable hygiene polypropylene films with desirable separation abilities for gases or small molecules. Furthermore, the polypropylene/alumina composite films have the potential for microwaveable packaging.
机译：人们一直致力于研究机械定向（MDO）/材料变量与各种应用中Al2O3颗粒填充定向PP孔隙率之间的相互关系。复合薄膜的制备方法是通过流延挤压，然后通过MDO机拉伸至100%和200%。当分散的氧化铝和连续的聚丙烯相之间的粘附失效时，薄膜拉伸过程中可能会发生空化。改性微粒和纳米微粒的复合膜不会产生任何空洞。另一方面，未改性氧化铝微粒的复合试样在热拉伸过程中在分散微粒和聚合物之间的接合处产生微孔。在这些薄膜中，β形核对试样产生的延展性起着重要作用。空化效率（空隙数）或膜渗透性取决于氧化铝颗粒的大小和数量，以及拉伸的比率和温度。尺寸范围为0.7-3μm的空化颗粒会产生约3-7μm的空穴。通过提取环保和抗菌活性氧化铝颗粒，产生的空穴可用于制造可持续卫生聚丙烯薄膜，具有理想的气体或小分子分离能力。此外，聚丙烯/氧化铝复合薄膜具有微波封装的潜力。

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