پوشش‌های ابرآب‌گریز پلی‌دی‌متیل‌سیلوکسان تهیه‌شده با رشد درجای نانورشته‌های سیلیکونی روی زیرآیند سنباده‌زنی‌شده

نوع مقاله : پژوهشی

نویسندگان

تبریز، دانشگاه صنعتی سهند، دانشکده مهندسی پلیمر، کد پستی 5331817634

چکیده

فرضیه: از لاستیک سیلیکونی‌ آب‌گریز به‌عنوان پوششی استفاده می‌شود که خاصیت آب‌گریزی ‌را در ‌سطوح مختلف ایجاد می‌کند. لاستیک‌های ‌سیلیکونی، ‌پایداری ‌شیمیایی ‌و ‌فیزیکی زیادی ‌دارند. خاصیت آب‌گریزی و ‌مقاومت ‌در ‌برابر‌ جریان ‌خزشی ‌از جمله ویژگی‌های منحصربه‌فرد پوشش‌های سیلیکونی است. هدف این پژوهش، سنتز لاستیک سیلکونی و تغییر خواص ترشوندگی سطح آن با ایجاد زبری و اصلاح شیمیایی با به‌کارگیری موادی با انرژی سطحی کم است.
روش‌ها: در این پژوهش، ابتدا لاستیک سیلیکونی با روش هیدروسیلیل‌دارکردن بر پایه کاتالیزگر پلاتین تهیه شد و سپس از آن برای پوشش‌دهی ورقه‌ پلی‌تترافلوئورواتیلن (PTFE) به‌عنوان زیرآیند با انرژی سطحی کم استفاده شد. به‌منظور ایجاد زبری سطح و افزایش زاویه تماس ایستا از سنباده‌های صنعتی با اندازه‌‌های زبری 220،120 و 400 استفاده شد. در مرحله بعد، از رشد نانورشته‌های سیلیکونی (SNF) با انرژی سطحی کم به‌‌کمک بخارنشانی برای اصلاح سطح استفاده شد.
یافته‌ها: طبق نتایج تصاویر میکروسکوپی الکترونی پویشی (SEM) تراکم زبری ایجادشده روی سطح نمونه با سنباده 400 بیشتر از سنباده 220 و تراکم زبری سنباده220 بیشتر از سنباده 120 بود. افزایش تراکم زبری باعث می‌شود، زاویه تماس ایستای آب (WCA) افزایش یابد. زیرا، در این حالت مدل Wenzel غالب نیست و سازوکار آب‌گریزی از نظریه Cassie-Baxter پیروی می‌کند. با توجه به بیشترین مقدار تراکم زبری ایجادشده روی سطح، زیرآیند PTFE عمل‌آوری‌شده با کاغذ سنباده 400 برای مرحله بعدی پوشش لاستیکی سیلیکونی و در نهایت برای رشد نانورشته‌های سیلیکونی روی لایه رویی سیلیکون استفاده شد. افزایش شایان توجه زاویه تماس ایستای آب پس از پوشش‌دهی با نانورشته‌های سیلیکونی (°159~ WCA) را می‌توان به کم‌بودن انرژی سطحی پوشش این نانورشته‌ها و افزایش زبری ناشی از رشد تصادفی آن‌ها نسبت داد.

کلیدواژه‌ها

عنوان مقاله [English]

Superhydrophobic Polydimethysiloxane Coatings Prepared by the in Situ Growth of Silicone Nanofilaments on a Sanded Substrate

نویسندگان [English]

  • Hossein Najafi
  • Kiyumars Jalili
  • Shahin Valizadeh
1. Faculty of Polymer Engineering, 2. Institute of Polymeric Materials; Sahand University of Technology, Postal Code 53318-17634, Tabriz, Iran
چکیده [English]

Hypothesis: Hydrophobic silicone rubber is used as coatings that create hydrophobic properties for different surfaces. Silicone rubbers have high chemical and physical stability. Hydrophobic properties and resistance to creeping flow are unique features of silicone rubber coatings. The purpose of this research is to synthesize and assess silicone rubber and alter its surface wettability by roughening and modifying the surface using materials with low surface energies.
Methods: Silicone rubber was first synthesized by hydrosilylation method in presence of a platinum catalyst, and subsequently coated onto polytetrafluoroethylene (PTFE) sheet as an example of a low surface energy substrate. In order to create roughness on the surface, industrial sandpapers were used of having grit sizes of 120, 220, and 400. In the next step, low surface energy silicon nanofilaments (SNF) were used to modify the desired surface, which were decorated on the surface of the sample through vapor deposition method. 
Findings: The SEM images show that the roughness density on the surface of the samples created by a 400-grit sandpaper is higher than that of a 220-grit sandpaper, and this sandpaper is also higher than that of a 120-grit sandpaper. Increasing the roughness density increases the static water contact angle (WCA) because in this case the Wenzel model is no longer dominant, and the hydrophobic mechanism follows Cassie Baxter theory. Due to the highest degree of roughness density created on the surface, the PTFE substrate treated with a 400 grit sandpaper was used for the next stage of silicone rubber coating and finally for the growth of SNF on top of the silicone layer. Applying SNF coating on the sample surface leads to a significant increase in the WCA (~159°). This hydrophobicity enhancement after SNF coating can be attributed to the low surface energy of the coating and the increase in roughness caused by the random growth of nanofilaments.

کلیدواژه‌ها [English]

  • Superhydrophobic coatings
  • polydimethylsiloxane
  • silicone nanofilaments
  • chemical vapor deposition
  • surface roughness

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مجله علوم و تکنولوژی پلیمر
دوره 35، شماره 6 - شماره پیاپی 182
بهمن و اسفند 1401
صفحه 541-554

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