دنیای نانو

دنیای نانو

اثر نانو ذرات سبز کیتوسان بر پایداری گرمایی و رفتار تخریب گرمایی نانو کامپوزیت های اپوکسی: پیشرفت های نوین

نوع مقاله : مقاله پژوهشی

نویسندگان
1 پژوهشگر پسا دکتری،گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه اصفهان، صندوق پستی 81746-73441 ، اصفهان، ایران
2 گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه اصفهان، صندوق پستی 73441 - ۸۱۷۴۶، اصفهان، ایران
3 گروه علوم مهندسی، دانشگاه ملی مهارت، تهران ، ایران
چکیده
نانوذرات کیتوسان و مشتقات اصلاح‌شده آن، به ویژه در ترکیب با رزین‌های اپوکسی، تأثیر قابل‌توجهی در بهبود خواص ریخت شناسی، مکانیکی و پایداری گرمایی نانو کامپوزیت های اپوکسی دارند. این نانوذرات با توزیع یکنواخت و ایجاد تعاملات قوی بین فازها، موجب افزایش استحکام کششی، مدول یانگ، چقرمگی و مقاومت گرمایی می‌شوند. اصلاح سطح کیتوسان با ترکیباتی مانند پلی‌سیلوکسان‌ها و آمونیوم فیتات، باعث تشکیل لایه‌های ذغالی متراکم‌تر هنگام گرما‌دیدگی شده و مقاومت به شعله و پایداری گرمایی را افزایش می‌دهد. افزودن کیتوسان به رزین اپوکسی باعث افزایش پایداری گرمایی می‌شود زیرا ساختارهای شبکه‌ای قوی‌تری ایجاد می‌کند و پیوندهای مولکولی مستحکمی به وجود می‌آورد که مقاومت در برابر تخریب گرمایی را بالا می‌برد. همچنین، توزیع بهینه نانوذرات و جلوگیری از تجمع ذرات، ساختار همگن و کارایی بالاتر مواد را تضمین می‌کند. خواص زیستی، ضدباکتریایی و قابلیت تجزیه‌پذیری کیتوسان، این ماده را به گزینه‌ای مناسب و دوستدار محیط زیست برای کاربردهای علمی متفاوت در صنعت تبدیل کرده است. در این پژوهش، اثر نانوذرات کیتوسان اصلاح‌شده بر ریخت شناسی، خواص مکانیکی، پایداری گرمایی و رفتار تخریب گرمایی نانوکامپوزیت‌های اپوکسی مورد تحلیل و بررسی قرار می‌گیرد. همچنین در ادامه، به پیشرفت‌های اخیر در زمینه نانوکامپوزیت‌های اپوکسی حاوی نانوذرات اصلاح‌شده پرداخته شده و مهم‌ترین نکات و یافته‌ها به‌صورت جامع جمع‌بندی شده‌اند.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Effect of Green Chitosan Nanoparticles on the Thermal Stability and Thermal Degradation Behavior of Epoxy Nanocomposites: Recent Advances

نویسندگان English

MohammadHossein Karami 1
Omid Moini Jazani 2
Mohammad Ali Etminani Isfahane 3
1 Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, P.O. Box 81746
2 Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, P.O. Box 81746-73441, Isfahan, Iran.
3 Department of Engineering Sciences, Technical and Vocational University(TVU), Tehran, Iran
چکیده English

Chitosan nanoparticles and their chemically modified derivatives, especially when integrated with epoxy resins, play a crucial role in significantly enhancing the morphological, mechanical, and thermal stability properties of epoxy-based nanocomposites. These nanoparticles contribute to improved tensile strength, Young’s modulus, toughness, and thermal resistance due to their uniform dispersion and strong interfacial bonding within the polymer matrix. Surface modification of chitosan with functional groups such as polysiloxanes and ammonium phytate promotes the formation of denser char layers during thermal degradation, which substantially increases flame retardancy and overall thermal stability. Incorporating chitosan into epoxy resin systems further enhances thermal stability by facilitating the creation of stronger crosslinked networks and robust molecular bonds, thereby improving resistance to thermal degradation. Achieving optimal nanoparticle distribution while preventing particle agglomeration is essential to maintain a homogeneous composite structure and maximize performance. Furthermore, the natural biological activity, antibacterial effects, and biodegradability of chitosan make it an environmentally friendly and highly suitable material for a wide range of industrial and biomedical applications. This study comprehensively investigates the influence of modified chitosan nanoparticles on the morphology, mechanical strength, thermal stability, and degradation behavior of epoxy nanocomposites. Recent progress in epoxy nanocomposites containing modified nanoparticles is also reviewed, summarizing key findings and emerging trends in this promising field.

کلیدواژه‌ها English

Epoxy Resin
Modified chitosan nanoparticles
Morphology
Mechanical properties
Thermal Degradation
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دوره 21، شماره 80
پاییز 1404
صفحه 60-79

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