علوم و فناوری کامپوزیت

مدل توسعه یافته میکرومکانیکی برای پیش بینی خواص الکتریکی نانوکامپوزیت های پلیمری حاوی نانو لوله های کربنی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه صنعتی همدان

چکیده

در این مقاله، یک مدل توسعه یافته میکرومکانیکی برای پیش بینی رسانایی الکتریکی موثر نانوکامپوزیت های پلیمری حاوی نانولوله های کربنی ارائه شده است. این مدل بر اساس نظریه میدان میانگین و با در نظر گرفتن پدیده تونل زنی کوانتومی الکترون ها بین نانو پرکننده ها ایجاد شده است. نانولوله های کربنی به شکل استوانه فرض شده اند که یک لایه بین فازی آنها را پوشش داده است. نانولوله های کربنی به صورت تصادفی در مکان های مختلف در داخل ماتریس پلیمری و با جهت گیری تصادفی توزیع شده اند. تاثیر پارامتر های گوناگون نظیر ابعاد هندسی نانولوله های کربنی، نسبت اندازه آنها، ضخامت لایه بین فازی، تونل زنی کوانتومی الکترون ها، رسانایی ماتریس پلیمر، رسانایی نانولوله های کربنی و رسانایی لایه بین فازی بر روی رسانایی موثر نانوکامپوزیت در مدل نظری در نظر گرفته شده اند. مدل ارائه شده رفتار های الکتریکی نانوکامپوزیت ها را در ناحیه عایق، ناحیه پرکولاسیون و ناحیه فلزی و همچنین گذار تیز رسانایی یا آغاز پرکولاسیون و ناحیه فلزی در کسر حجمی های بالا را به خوبی بازتولید می کند. نتایج نشان می دهد که با افزایش اندازه نانولوله های کربنی در نانوکامپوزیت، آستانه پرکولاسیون کاهش می یابد. مقدار رسانایی پرکننده و ماتریس به ترتیب تنها بر ناحیه فلزی و عایق اثر گذار هستند. به منظور صحت سنجی ، نتایج آزمایشگاهی موجود در مطالعات قبلی با مدل حاضر پیش بینی شده است که مدل ارائه شده به خوبی این نتایج تجربی را پیش بینی می کند.

کلیدواژه‌ها

عنوان مقاله [English]

A developed micromechanical model to predict electrical properties of polymer nanocomposites containing carbon nanotubes

نویسندگان [English]

  • Mojtaba Mazaheri
  • Javad Payandehpeyman

Hamedan University of Technology

چکیده [English]

In this paper, a developed micromechanical model to predict the effective electrical conductivity of polymer nanocomposites containing carbon nanotubes was presented. This model was based on mean field theory and considering the quantum tunneling phenomenon of electrons between nanofillers. Carbon nanotube was assumed to be cylindrical, which was covered by an interphase layer. Carbon nanotubes were randomly distributed and oriented inside the polymer matrix. The effect of various parameters such as the geometric dimensions of carbon nanotubes, their aspect ratio, the thickness of the interphase layer, the quantum tunneling of electrons, the conductivity of the polymer matrix, the conductivity of carbon nanotubes and the conductivity of the interphase layer on the effective conductivity of the nanocomposite were considered in the theoretical model. The presented model reproduced the electrical behavior of nanocomposites in the insulating region, the percolation region, and the metal region, as well as the sharp transition of conductivity or the beginning of percolation and the metal region in high volume fractions. The results showed that by increasing the size of carbon nanotubes in nanocomposite, the percolation threshold decreased. The conductivity values of the filler and the matrix, respectively, only affected the metal and insulation areas. Finally, the present model was used to reproduce the experimental reported data that the predicted results were in good agreement with the experimental data.

کلیدواژه‌ها [English]

  • Conductive polymer nanocomposite
  • Carbon nanotube
  • Interphase layer
  • Percolation threshold
  • Micromechanical model
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علوم و فناوری کامپوزیت
دوره 9، شماره 2
شهریور 1401
صفحه 1961-1969
فایل ها
هم رسانی
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