اصلاح فیزیکوشیمیایی سطح پلی‌تترافلوئورواتیلن با استفاده از پلاسما‌ی سرد فشار اتمسفری تخلیه سد دی‌الکتریک سطحی: ارتقاء ترشوندگی و زبری نانومقیاس

نوع مقاله : مقاله پژوهشی

نویسندگان

پژوهشکده پلاسما و گداخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، تهران، ایران

چکیده

مقدمه و اهداف: پلی‌تترافلوئورواتیلن، به‌عنوان یک پلیمر مهندسی پرکاربرد در صنعت شناخته می‌شود. بااین‌حال، ماهیت آب‌گریز و انرژی سطحی پایین آن، چالش‌های جدی در زمینه چسبندگی و پوشش‌پذیری ایجاد کرده است. در این پژوهش، از پلاسمای تخلیه سد دی‌الکتریک سطحی با ساختار مشبک بهره گرفته شد تا با ایجاد تغییرات فیزیکی و شیمیایی در سطح پلی‌تترافلوئورواتیلن، ویژگی‌های آن بهبود یابد. 
مواد و روش‌ها: برای ارزیابی اثر فرآیند پلاسمادهی، زاویه تماس قطره آب روی سطح نمونه‌ها اندازه‌گیری شد. علاوه‌براین، برای بررسی تغییرات مورفولوژیکی سطح، تصاویر میکروسکوپی نیروی اتمی مورد تحلیل قرار گرفتند و تغییرات شیمیایی ایجادشده روی سطح با استفاده از طیف‌سنجی مادون قرمز تبدیل فوریه مورد مطالعه قرار گرفت.
یافته‌ها: نتایج حاکی از کاهش چشمگیر زاویه تماس، از حدود 98 درجه به 35 درجه است که بهبود 64 درصدی زاویه تماس سطح با آب را نشان می‌دهد. این یافته که بیانگر افزایش قابل توجه آب‌دوستی و انرژی سطحی است، قابل مقایسه و در بسیاری از موارد بهتر از نتایج مطالعات پیشین در این زمینه است. همچنین، پلاسمادهی منجر به افزایش زبری سطح و شکل‌گیری ناهمواری‌های نانومقیاس در سطح پلی‌تترافلوئورواتیلن شده است. این تغییرات ساختاری علاوه بر بهبود ترشوندگی، تأثیر بسزایی در افزایش قابلیت چسبندگی این پلیمر دارد.
نتیجه‌‌گیری: نتایج نشان می‌دهد که اصلاح سطحی پلی‌تترافلوئورواتیلن با پلاسما‌ی تخلیه سد دی‌الکتریک سطحی، روشی مؤثر، زیست‌سازگار و مقرون‌به‌صرفه برای افزایش عملکرد سطحی این پلیمر است که می‌تواند مسیرهای جدیدی را برای کاربردهای گسترده‌تر آن در حوزه‌هایی همچون مهندسی سطح، زیست‌مواد و میکروالکترونیک هموار سازد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Physicochemical Modification of Polytetrafluoroethylene Surface Using Cold Atmospheric Pressure Surface Dielectric Barrier Discharge Plasma: Enhancing Wettability and Nanoscale Roughness

نویسندگان [English]

  • Soolmaz Jamali
  • Ameneh Kargarian
Plasma and Fusion Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
چکیده [English]

Introduction and Objectives: Polytetrafluoroethylene is known as a widely used engineering polymer in industry. However, its hydrophobic nature and very low surface energy causes serious challenges in the adhesion and coating. In this study, in order to modify the surface of this polymer, the surface dielectric barrier discharge plasma processing with grid structure was used to improve its properties by creating physical and chemical changes on the surface of polytetrafluoroethylene.
Materials and Methods: The contact angle of the water droplet on the surface of the samples was measured before and after treatment to evaluate the effect of the plasma processing. In addition, Atomic Force Microscope and Fourier Transform Infrared spectroscopy analysis were utilized to investigate the surface morphological and chemical changes.
Results: The results indicated a significant decrease in the contact angle from about 98 degrees to 35 degrees, indicating a 64% improvement in the surface contact angle with water. This finding which represents a significant increase in hydrophilicity and surface energy, is comparable and in many cases better than the results of previous studies in this field. Plasma processing led to an increase in surface roughness and the formation of nanoscale asperities on the surface of the polytetrafluoroethylene. These structural changes led to improved wettability and adhesion of this polymer.
Conclusions: The findings of this study illustrate that surface modification of polytetrafluoroethylene using surface dielectric barrier discharge plasma processing is an effective, fast, biocompatible, and cost-effective method for enhancing the surface functionality of this polymer. This method can pave new paths for its broader applications in areas such as surface engineering, biomaterials, and microelectronics.

کلیدواژه‌ها [English]

  • Surface dielectric barrier discharge (SDBD)
  • Polytetrafluoroethylene polymer
  • Surface modification
  • Contact angle
  • Surface energy
  • Surface roughness

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مواد پیشرفته در مهندسی
دوره 45، شماره 1
(شماره پیاپی 52)
فروردین 1405
صفحه 63-77

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