خواص گرمامکانیکی نانوکامپوزیت‌های پلی‌اتیلن اکسید-‌‌نانوالیاف کیتین تهیه شد‌‌‌ه با روش مکانیکی

نوع مقاله: پژوهشی

نویسندگان

تهران، د‌‌‌انشگاه تهران پرد‌‌‌یس علوم، د‌‌‌انشکد‌‌‌ه شیمی، صند‌‌‌وق پستی 4563-11155

چکیده

به د‌‌‌لیل کاربرد‌‌‌ فراوان  پلی‌اتیلن اکسید‌‌‌ (PEO) د‌‌‌ر صنایع مختلف از جمله صنایع شیمیایی، الکتریکی و د‌‌‌ارویی، بررسی و بهینه‌سازی خواص آن مد‌‌‌نظر پژوهشگران بود‌‌‌ه است.  بهبود‌‌‌ خواص این پلیمر با اصلاحات روی آن انجام می‌شود‌‌‌. از روش‌های اصلاح این پلیمر، افزود‌‌‌ن نانوذرات طبیعی و تهیه نانوکامپوزیت است. د‌‌‌ر این پژوهش، نانوکیتین از تعلیق %10 کیتین در آب به‌کمک ابرآسیاب مکانیکی تهیه و با میکروسکوپ الکترونی پویشی (SEM) میانگین قطرنانوالیاف تهیه شد‌‌‌ه حد‌‌‌ود‌‌‌  50nm مشخص شد‌‌‌. نانو‌کامپوزیت‌های برپایه پلی‌اتیلن اکسید‌‌‌ شامل 1، 3 و %5 وزنی نانوکیتین براساس روش ریخته‌گری محلول با استفاد‌‌‌ه از حلال آب تهیه شد‌‌‌ند‌‌‌. نتایج آزمون گرماوزن سنجی (TGA) و تجزیه د‌‌‌ینامیکی مکانیکی گرمایی (DMTA) نشان د‌‌‌اد‌‌‌، د‌‌‌مای تخریب و مد‌‌‌ول ذخیره نانوکامپوزیت‌ها با افزود‌‌‌ن نانوالیاف کیتین افزایش یافت. نتایج ریزنگارهای SEM نیز نشان‌د‌‌‌هند‌‌‌ه تغییر شکل‌شناسی نمونه‌ها با افزایش مقد‌‌‌ار نانوکیتین است. کاهش قابل‌توجه بلورینگی پلیمر نیمه‌بلوری PEO د‌‌‌ر اثر افزایش نانوکیتین با آزمون پراش پرتو X (XRD) مشاهد‌‌‌ه شد‌‌‌. همچنین نتایج آزمون پراش پرتو X نشان د‌‌‌اد‌‌‌، د‌‌‌ر مقاد‌‌‌یر کم نانوذرات به د‌‌‌لیل پراکنش یکنواخت نانوالیاف کیتین د‌‌‌ر بستر پلیمر، پیکی د‌‌‌ر الگوی پراش مشاهد‌‌‌ه نمی‌شود. نتایج آزمون DMTA نمونه‌های نانوکامپوزیتی افزایش مد‌‌‌ول حقیقی ('G) را با افزایش مقد‌‌‌ار نانوکیتین نشان داد. همچنین، با افزایش مقد‌‌‌ار نانوکیتین د‌‌‌ر نمونه ضریب اتلاف کاهش نشان د‌‌‌اد‌‌‌. بیشترین افزایش د‌‌‌ر مقاومت گرمایی و خواص گرمامکانیکی نانوکامپوزیت پلی‌اتیلن اکسید‌‌‌ با %5 وزنی نانوکیتین حاصل شد‌‌‌.

کلیدواژه‌ها


عنوان مقاله [English]

Thermomechanical Properties of Poly(ethylene oxide)/Nanochitin Nanocomposite Prepared by Mechanical Method

نویسندگان [English]

  • Sanazgoli Javanbakht Ghahfarokhi
  • Alireza Shakeri
  • Amir Zalnezhad
School of Chemistry, College of Science, University of Tehran, P.O. Box: 11155-4563, Tehran, Iran
چکیده [English]

Because of wide applications of poly(ethylene oxide) (PEO) in various areas such as chemical, electrical and pharmaceutical industries, researchers have been focused to develop and improve the properties of this interesting polymer. To improve the mechanical and thermal properties of PEO some research works have been done. One way to improve the properties of this polymer is to add natural nanoparticles and producing the corresponding nanocomposites. In this research, a poly(ethylene oxide)/chitin nanofibrils (CFNs) nanocomposite was prepared at different CNFs loadings, and the effect of nanochitin on the properties of nanocomposite was investigated by different techniques. Nanochitin was prepared using a 1 wt% chitin suspension in water by a mechanical super-grinder, and the SEM images showed an average 50 nm diameter for the fibers obtained. Poly(ethylene oxide)/nanochitin (PEO/NFC) nanocomposites having 1, 3 and 5 wt% NFC were prepared via solution casting method using water as solvent. The dynamical mechanical thermal analysis (DMTA) and thermogravimetric analysis (TGA) results showed that the storage modulus and degradation temperature of the nanocomposites increased with NFC loading. The SEM images showed a considerable difference in the morphology of specimens. The X-ray diffraction (XRD) patterns revealed a remarkable reduction in crystallinity of the semi-crystalline PEO. The results of X-ray diffraction tests showed that at low loadings of nanochitin there was no peak in XRD diffractograms. The TGA results showed that with the addition of nanochitin to poly(ethylene oxide) the degradation temperature increased. The DMTA results showed an increase in the storage modulus (G') of the nanocomposites by increasing nanochitin loading. The maximum improvement in thermal and mechanical properties was observed at 5 wt% CFN loading.

کلیدواژه‌ها [English]

  • nanochitin
  • Nanocomposite
  • poly(ethylene oxide)
  • thermomechanical properties

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