رسانندگی الکتریکی آمیخته پلی‌اتیلن پرچگالی-پلی‌آمید 6 القایی با نانولوله کربن چنددیواره

نوع مقاله : پژوهشی

نویسندگان

یزد، دانشگاه یزد، پردیس فنی و مهندسی، گروه مهندسی شیمی و پلیمر، صندوق پستی 741-89195

چکیده

فرضیه: یکی از روش‌های بهبود رسانندگی الکتریکی نانوکامپوزیت‌ها استفاده از آمیخته‌های امتزاج‌ناپذیر دارای پرکننده رسانا بر اساس مفهوم تراوایی دوتایی است. در پژوهش حاضر، خواص الکتریکی و رئولوژیکی آمیخته پلی‌اتیلن پرچگالی-پلی‌آمید6 (HDPE/PA6) در مجاورت نانولوله‌های کربن چنددیواره (MWCNTs) بررسی شد.
روش‌ها: نمونه‌های بر پایه آمیخته HDPE/PA6 به همراه پلی‌اتیلن پرچگالی پیوندخورده با مالئیک انیدرید (HDPE-g-MA) به‌عنوان سازگارکننده و نیز دارای 1، 3 و %5 وزنی MWCNTs با روش اختلاط مذاب در مخلوط‌کن داخلی تهیه شدند. سپس، آزمون‌های مختلف برای بررسی شکل‌شناسی، رئولوژی و خواص الکتریکی نمونه‌های دارای مقدارهای وزنی مختلف MWCNT انجام و نتایج حاصل مطالعه شد.
یافته‌ها: تصاویر میکروسکوپی الکترونی پویشی (SEM) نمونه پرنشده شکل‌شناسی به‌هم‌پیوسته را نشان داد و وجود MWCNTs در آمیخته نیز موجب کاهش تنش بین‌سطحی به شکل‌شناسی به‌هم پیوسته و سازگاری آمیخته شد. خواص رئولوژیکی با طیف‌نمایی رئومتر مکانیکی مذاب (RMS) مطالعه شد. نتایج نشان داد، با افزایش مقدار MWCNTs، مدول ذخیره و گرانروی مختلط نانوکامپوزیت‌ها نسبت به آمیخته خالص افزایش یافت و مدول ذخیره در نهایت به ناحیه مسطح در بسامد کم ‌رسید که بیانگر آستانه تراوایی رئولوژیکی نانوکامپوریت است. مدول ذخیره و ضریب اتلاف نمونه‌های آمیخته با آزمون دینامیکی-مکانیکی (DMA) ارزیابی شد. با افزایش مقدار MWCNT، بیشینه ضریب اتلاف مربوط به فاز PA6 در نانوکامپوزیت‌ها نسبت به فاز مشابه در آمیخته پرنشده کاهش یافت. همچنین، دمای بیشینه ضریب اتلاف فاز PA6 به دماهای بیشتر جابه‌جا شد، در حالی‌که بیشینه ضریب اتلاف فاز HDPE تقریباً ثابت بود که بیانگر وجود مقدار بیشتری MWCNTs در فاز PA6 است. نتایج رسانندگی الکتریکی با روش کاونده چهارنقطه‌ای نشان داد، رسانندگی الکتریکی نانوکامپوزیت با افزودن %5 وزنی MWCNTs افزایش چشمگیری یافته است.

کلیدواژه‌ها

عنوان مقاله [English]

Electrical Conductivity of High Density Polyethylene/Polyamide 6 Blend Induced by Multi-wall Carbon Nanotubes

نویسندگان [English]

  • Bentolhoda Liravi
  • Mitra Tavakoli
Department of Chemical and Polymer Engineering, Faculty of Engineering, Yazd University, P.O. Box 89195-741, Yazd, Iran
چکیده [English]

Hypothesis: One method to improve the electrical conductivity of nanocomposites is the use of immiscible blends containing conductive fillers based on the concept of double percolation. In this research, the electrical and rheological properties of high density polyethylene/polyamide 6 (HDPE/ PA6) blend in presence of multi-wall carbon nanotubes (MWCNTs) were investigated.
Methods: Samples based on HDPE/PA6 blend with maleic anhydride-grafted high density polyethylene (HDPE-g-MA) as a compatibilizer and also containing 1, 3 and 5% (by wt) MWCNTs were prepared by melt mixing process in an internal mixer. Then different analyses were performed to investigate the morphology, rheology and electrical properties of samples with different weight percentages of MWCNT and the results were studied.
Findings: Scanning electron microscopy (SEM) images of an unfilled blend showed co-continuous morphology and the presence of MWCNTs in the blend also resulted in co-continuous morphology1 and compatibility of the blend with reduced interfacial tension. The rheological properties were characterized using melt rheometric mechanical spectroscopy (RMS). The results showed that with increasing MWCNT content, the storage modulus and complex viscosity of the nanocomposites increased compared to the neat blend and the storage modulus eventually reached a low-frequency plateau region, indicating a rheological percolation threshold of nanocomposite. Storage modulus and loss factor of the blend samples were evaluated using dynamic mechanical analysis (DMA). With increasing MWCNT content, the maximum loss factor of PA6 phase in the nanocomposites decreased with respect to similar phase in the unfilled blend, whereas the maximum loss factor of HDPE phase remained almost constant, indicating a higher presence of MWCNTs in PA6 phase. Also the temperature of the maximum loss factor of the PA6 phase shifted to higher temperatures. The electrical conductivity results according to the four-point probe method showed that the electrical conductivity of the nanocomposite increased significantly by adding 5%  (by wt) MWCNTs.

کلیدواژه‌ها [English]

  • high density polyethylene
  • polyamide 6
  • multiwall carbon nanotube
  • electrical percolation
  • rheology

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مجله علوم و تکنولوژی پلیمر
دوره 33، شماره 2 - شماره پیاپی 166
خرداد و تیر 1399
صفحه 125-136

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