تأثیر نانوذرات SiO2 عامل‌دارشده بر خواص فیزیکی و مکانیکی چندسازه‌های پلی‌اتیلن با دانسیتۀ کم/کاه گندم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار گروه علوم و صنایع چوب و کاغذ، دانشکدۀ منابع طبیعی، دانشگاه زابل، زابل، ایران

2 استادیار گروه پژوهشی مواد سلولزی و بسته‌بندی، پژوهشکدۀ شیمی و پتروشیمی، پژوهشگاه استاندارد، کرج، ایران

چکیده

هدف پژوهش حاضر، بررسی تأثیر کاربرد نانوذرات SiO2 عامل‌دارشده بر خواص فیزیکی و مکانیکی چندسازه‌های پلی‌اتیلن سبک تقویت‌شده با کاه گندم بوده است. آب‌دوستی زیاد نانوذرات SiO2 سبب می‌شود که ذرات به‌آسانی کلوخه‌ای شده و در ماتریس پلیمری به‌سختی پراکنده شوند؛ بنابراین اصلاح سطح نانوذرات SiO2 مؤثرترین روش برای رفع این مشکلات است. ابتدا نانوذرات SiO2 با ۳-آمینوپروپیل-تری‌متوکسی سیلان (APTMS) اصلاح شدند و سپس چندسازه‌های پلی‌اتیلن سبک/کاه گندم با درصدهای مختلف نانوذرات SiO2 عامل‌دارشده (۰، ۱، ۲، ۳ و ۵ درصد)، با روش اختلاط مذاب آماده شدند. تغییر در ساختار شیمیایی نانوذرات SiO2تیمارشده با استفاده از طیف‌سنجی تبدیل فوریۀ مادون قرمز (FTIR) ارزیابی شد. از میکروسکوپ الکترونی روبشی نشر میدانی (FESEM) برای بررسی توزیع نانوذرات SiO2 عامل‌دارشده در چندسازه‌ها استفاده شد. در پایان خواص فیزیکی و مکانیکی (مقاومت کششی، مدول کششی، مقاومت خمشی و مدول خمشی) نانوکامپوزیت‌ها بررسی شد. ظاهر شدن پیوند N-H در عدد موجی cm-1 ۶۹۵ و گروه‌های C-H آلیفاتیک در cm-1 ۲۸۴۱ و cm-1 ۲۹۴۷، پیوند موفقیت‌آمیز APTMS را بر سطح نانوذرات SiO2 نشان داد. براساس نتایج، استفاده از نانوذرات SiO2 عامل‌دارشده به‌عنوان عامل تقویت‌کننده در چندسازه‌ها، موجب افزایش خواص مکانیکی و کاهش جذب آب چندسازه‌ها می‌شود.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of surface functionalized SiO2 nanoparticles on the physical and mechanical properties of wheat straw/LDPE composites

نویسندگان [English]

  • Mohammad Dahmardeh Ghalehno 1
  • Behzad Kord 2
  • Farnaz Movahedi 2
1 Assist., Prof., Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Zabol, Zabol, I.R. Iran.
2 Assist., Prof., Department of Cellulosic Materials and Packaging, Chemistry and Petrochemistrry Research Center, Standard Research Institute (SRI), Karaj, I.R. Iran.
چکیده [English]

The scope of the present article is to study the effect of surface-functionalized SiO2 nanoparticles on the physical and mechanical properties of wheat straw flour reinforced by low-density polyethylene composites. The high hydrophilicity of nano-SiO2 originates from their amorphous structure and can induce the particles to be easily agglomerated and hardly dispersible in polymer matrix. Consequently, surface modification of SiO2 nanoparticles is the most effective way to vanquish these problems. Firstly, the SiO2 nanoparticles were modified by 3-aminopropyl-trimethoxysilane (APTMS), and then the wheat straw flour / low-density polyethylene composites containing different percentages of functionalized nano-SiO2 (0, 1, 2, 3 and 5%) were prepared via a melt compounding. Changes in the chemical structure of treated SiO2 were tracked by Fourier transform infrared (FTIR) spectroscopy. Field emission scanning electron microscopy (FESEM) was also investigated to study the distribution of SiO2 nanoparticles in the composites. Finally, the physical and mechanical properties (tensile strength, tensile modulus, bending strength, and bending modulus) of the nanocomposites were evaluated. The appearance of N–H bond at 695 cm−1 and aliphatic C–H bonds at 2841 cm−1 and 2947 cm−1 were indications of successful grafting of APTMS on the functionalized SiO2 nanoparticles. According to the results, using functionalized SiO2 nanoparticles as a reinforcing agent in wood plastic composites resulted in an increase in the tensile and bending strengths and a decrease in the water absorption of the composites.

کلیدواژه‌ها [English]

  • Water absorption
  • mechanical properties
  • nanocomposite
  • surface functionalized SiO2 nanoparticles

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نشریه جنگل و فرآورده های چوب
دوره 74، شماره 1
خرداد 1400
صفحه 125-136

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