شیمى کاربردى روز

شیمى کاربردى روز

پوشش‌های نانوکامپوزیت فلورسنت پلی یورتان آکریلات پخت شونده با اشعه فرابنفش تقویت‌شده با نقاط کوانتومی کربن: تهیه و بررسی خواص انسداد پرتوهای فرابنفش و ضد خوردگی

نوع مقاله : مقاله علمی پژوهشی

نویسندگان
1 انکوباتور فناوری رنگ، موسسه علوم و فناوری رنگ، 1668814811، تهران، ایران
2 گروه رزین و مواد افزودنی، پژوهشکده علوم و فناوری رنگ، 1668814811، تهران، ایران
3 دانشکده هنر و معماری، دانشگاه آزاد اسلامی واحد تهران غرب، 1468763785، تهران، ایران
چکیده
اغلب پلیمرها در معرض پرتوهای فرابنفش خورشید تخریب شده و خواص مکانیکی خود را از دست می دهند. پوشش های پلیمری معمولا برای حفاظت از سطوح فلزی در برابر خوردگی به کار می روند. بنابراین ساخت پوشش های محافظ سطوح فولادی همراه با قابلیت انسداد پرتوهای فرابنفش خورشیدی یک نیاز ضروری می باشد.
هدف اصلی این تحقیق سنتز پوشش‌های نانوکامپوزیت فلورسنت پلی یورتان آکریلات (PUA) پخت شونده با اشعه فرابنفش تقویت‌شده با نقاط کوانتومی کربن و بررسی تغییرات ایجاد شده بر اثرافزودن نقاط کوانتومی کربن (CQDs) بر خواص گوناگون این پوشش ها بود. برای سنتز الیگومر PUA به جای استفاده از پلی ال های شیمیایی، از روغن کرچک به عنوان یک پلی ال طبیعی و زیست سازگار استفاده شد. CQDs از پیرولیز مخلوط نشاسته در آب به روش مایکروویو سنتز شدند. برای شناسایی پوشش های سنتز شده و بررسی اثر تقویت کنندگی CQDs بر نانوکامپوزیت حاصل، از روش های الکتروسکوپی استفاده شد. افزودن CQDs 0.5 wt% به رزین PUA سبب تقویت استحکام چسبندگی و پایداری حرارتی درPUA/CQDs (0.5 wt%) در مقایسه با پوشش PUA (خالص) گردید. با قرار گرفتن فیلم PUA/CQDs در برابر پرتوهای فرابنفش، فلوئورسانس آبی نشر گردید و همچنین نوارهای جذبی قوی در همه مناطق فرابنفش دیده شدند. بیشتر پرتوهای فرابنفش از فیلم PUA عبور کردند اما بیش از %99 از پرتوهای UV توسط فیلم PUA/CQDs مسدود شد. نتایج به دست آمده از آزمون های مه نمکی و EIS تایید کردند در پوشش حاوی CQDs 0.5 wt% در مقایسه با پوشش خالص، مقاومت در برابر خوردگی بهبود یافت.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Fluorescent UV-curable Polyurethane Acrylate Nanocomposite Coatings Strengthened with Carbon Quantum Dots: Preparation and Investigation of UV-blocking and Anti-Corrosive Properties

نویسندگان English

Abbas Madhi 1
Behzad Shirkavand Hadavand 2
Mohammad Hassan Madhi 3
Zahra Rahmani 2
1 Color Technology Incubator, Institute for Color Science and Technology
2 Department of Resin and Additives, Institute for Color Science and Technology, 1668814811, Tehran, Iran
3 Faculty of Art and Architecture, Islamic Azad University West Tehran Branch,1468763785, Tehran, Iran
چکیده English

Most polymers exposed to UV radiating from the sun deteriorate and lose their mechanical features. Polymer coatings are generally used for protection of metal surfaces against corrosive factors. Thus, production of coatings blocking the sunlight UV rays is necessary to protect the metal surfaces. This work mainly focuses on synthesis of fluorescent bio-based UV-curable polyurethane acrylate (PUA) and studies the changes occurred in the various specifications of these coatings resulted from adding carbon quantum dots (CQDs). To synthesize PUA oligomer, castor oil was applied as a natural and biocompatible substance instead of chemical polyols. By pyrolysis of the starch and water blend, CQDs were synthesized using microwave-assisted method. To characterize the synthesized coatings and to analyze the reinforcing effect of CQDs on the resultant nanocomposite, electroscopic methods were utilized. Adding CQDs 0.5 wt% to PUA resin resulted in improvement of adhesion strength and thermal stability in PUA/CQDs (0.5 wt%) coating compared to PUA (pure) coating. With exposing PUA/CQDs to UV rays, blue fluorescence was emitted and strong absorption bands also appeared in all of the UV regions. Most of the UV rays passed through the PUA film, while PUA/CQDs blocked higher than 99% of UV radiation. Results from salt spray and EIS tests confirmed that resistance to corrosion was improved in PUA/CQDs coating versus the pure coating.

کلیدواژه‌ها English

Bio-based
Polyurethane acrylate
Fluorescent coatings
UV-blocking property
Anti-corrosive behavior
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