نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار ، مهندسی مکانیک ، دانشگاه شهید بهشتی ، تهران.

2 دانشجو ، مهندسی پلیمر ، دانشگاه آزاد اسلامی واحد تهران جنوب ، تهران.

3 گروه لاستیک، پژوهشگاه پلیکر و پتروشیمی

4 استاد ، مهندسی پلیمر ، پژوهشگاه پلیمر و پتروشیمی ایران ، تهران.

10.22068/jstc.2019.97568.1491

چکیده

در این تحقیق، ترموپلاستیک الاستومر بر پایه پلی آمید 6 (PA6) و لاستیک آکریلونیتریل بوتادین (NBR) تقویت شده با نانو صفحات گرافن (GNP) با مخلوط کن داخلی تولید شد. تاثیر درصد GNP (0.5، 1 و 2 درصد وزنی) بر روی خواص حرارتی، مکانیکی و ریزساختار سه ترکیب درصد نانوکامپوزیت PA6/NBR (90/10، 70/30 و 50/50) مورد بررسی قرار گرفت. آزمون پراش پرتو ایکس (XRD)، گرماسنجی تفاضلی روبشی (DSC)، آنالیز دینامیکی مکانیکی حرارتی (DMTA)، میکروسکوپ الکترونی روبشی (SEM) و تست های مکانیکی انجام شد تا ریز ساختار، خواص حرارتی و مکانیکی این نانو کامپوزیت ها مورد بررسی قرار گیرد. نتایج نشان می دهد که خواص مکانیکی نانو کامپوزیت های PA6/NBR/GNP مثل استحکام و مدول کششی با افزایش GNP در مخلوط PA6/NBR افزایش می یابد، در حالی که با افزایش مقدار NBR این خواص کاهش می یابد. بررسی تاثیر درصد GNP و NBR بر روی رفتار بلورینگی نانوکامپوزیت های PA6/NBR/GNP نشان می دهد که دمای بلورینگی PA6 در حضور GNP افزایش می یابد درحالی که افزایش NBR باعث کاهش دمای بلورینگی می شود. مدول ذخیره PA6، در حضور GNP به مقادیر بالاتر تغییر می کند. بهبود مدول ذخیره در حضور نانو ذرات به دلیل سختی فوق العاده GPN و کاهش حرکت زنجیره های پلیمری است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental study of microstructure, thermal and mechanical properties of PA6/NBR nanocomposites reinforced with graphene nanoparticle

نویسندگان [English]

  • Mohammad -Reza Nakhaei 1
  • Shohreh Mohammadi 2
  • Ghasem Naderi 3
  • Mir -Hamidreza Ghoreishy 4
  • Ghasem Naderi 4

1 Faculty of Mechanic and Energy, Shahid Beheshti University, Tehran, Iran.

2 Department of Polymer Engineering, Islamic Azad University, South-Tehran Branch, Tehran, Iran.

3 Iran Polymer and Petrochemical Institute, Tehran, Iran

4 Faculty of Processing, Iran Polymer and Petrochemical Institute, Tehran, Iran.

چکیده [English]

In this study, thermoplastic elastomer (TPE) nanocomposites based on polyamide-6 (PA6) and acrylonitrile butadiene rubber (NBR) reinforced by Graphene nanoparticle (GNP) were prepared via a Haake internal mixer. The effects of GNP content (0.5, 1 and 2 wt %) on the thermal, mechanical, and microstructure properties of three composition ratios of PA6/NBR (90/10, 70/30 and 50/50) nanocomposites were investigated. X-ray diffraction (XRD), differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), scanning electron microscopy (SEM) and mechanical (tensile and impact) test were performed to determine the morphology and mechanical and thermal properties of this nanocomposite. The results showed that the mechanical characteristics of the PA6/NBR/GNP nanocomposites such as the tensile and modulus strength increased with increasing of GNP content in PA6/NBR blends, while these properties decreased when NBR content increased. Investigating the effect of GNP and NBR content on the crystallization behavior of PA6/NBR/GNP nanocomposites show that the crystallization temperature of PA6 increased with the presence of GNP whereas the increase in NBR phase content leads to reduction of crystallization temperature. The storage modulus of PA6 shifts to higher value with the presence of GNP. The improvement of the storage modulus, with the introduction of nanoparticles was the result of the extraordinary stiffness of GNPs and the restricted mobility of the polymer chains.

کلیدواژه‌ها [English]

  • Polyamide 6
  • Acrylonitrile Butadiene Rubber
  • Graphene nano-platelets
  • Nanocomposite
  • Mechanical properties

 

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