تاثير غلظت نانوذارت اكسيد روي بر خواص آبگريزي پلي‌پروپيلن

The Effects of Nano Zinc Oxide Content on the Hydrophobic Properties of Polypropylene and Feasibility of Producing Superhydrophobic Nanocomposite Coatings

در اين پژوهش، پوشش ابرآبگريزي از پلي‌‌پروپيلن گريد (MFI 6) با نانوذرات اكسيد روي به روش ريخته‌گري محلولي بر روي شيشه توليد شد و شرايط بهينه معرفي گرديد. ريخته‌گري محلولي به عنوان روشي ساده و كم هزينه مي‌باشد كه براي توليد پوشش ابرآبگريز استفاده شد و تاثير دو پارامتر غلظت نانوذرات اكسيد روي و دماي خشك شدن بر خواص نهايي و عملكرد پوشش‌هاي ابرآبگريز بررسي گرديد. مطالعه بر روي آبگريزي پوشش‌ها بر مبناي آزمون زاويه تماس (CA) نشان داد كه رفتار ابرآبگريزي از خود به نمايش مي‌گذارد و طبق مشاهدات دستگاه ميكروسكوپ الكتروني روبشي (SEM) پوششي با سطحي زبر و آبگريز بدست آمد بطوريكه سطح هر چه زبرتر باشد زاويه تماس بالاتر ايجاد مي‌شود اگر اين مقدار به 150 تا 180 درجه برسد سطح ابرآبگريز خواهد شد. افزايش غلظت نانوذرات اكسيد روي به پلي‌پروپيلن باعث ايجاد زبري بيشتر در سطح شد. زبري بوجود آمده در سطح داراي مقياس نانو و ميكرو بود كه با افزايش بيش از اندازه نانوذرات اكسيد روي از زبري پوشش كاسته شد و آبگريزي آن كاهش پيدا كرد كه دليل آن انباشتگي نانوذرات اكسيد روي است.

In this research, a super hydrophobic coating grade polypropylene (MFI6) with nanoparticles of ZnO was produced on glass by using solution casting technique and the optimal conditions were introduced as well. Solution casting as a simple and inexpensive method does not require any special equipment in order to produce super hydrophobic coatings. Therefore, the effect of two parameters namely, the concentration nanoparticles of ZnO and the drying temperature, on the final properties and performance hydrophobic coatings were investigated. Regarding the studies which have been done on coatings based on the hydrophobicity of the contact angle (CA), it was showed that the hydrophobicity of super hydrophobic coatings behavoirs were exhibited and according to observations of a scanning electron microscope (SEM) devise, a rough and hydrophobic surface was resulted. Thus, the rougher the surface, the higher contact angle is generated, and if this value reaches 150 to 180 °C, the surface would change to a super hydrophobic surface. Increasing the concentration of ZnO nanoparticles to polypropylene has led to more surface roughness. Therefore, the created surface roughness was in micro and nanoscale, while because of an extreme increase in ZnO nanoparticles, the surface roughness was reduced and hydrophobicity was decreased as well due to high accumulation.