نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشیار، مهندسی مکانیک، دانشگاه تربیت دبیر شهید رجائی، تهران، ایران

2 دانشجوی کارشناسی ارشد، مهندسی مکانیک، دانشگاه تربیت دبیر شهید رجائی، تهران، ایران

3 استاد، مهندسی پلیمر، پژوهشگاه پلیمر و پتروشیمی ایران، تهران، ایران

4 دانشجوی دکترا، مهندسی مکانیک، دانشگاه تربیت دبیر شهید رجائی، تهران، ایران

چکیده

در این تحقیق، خواص مکانیکی نانو کامپوزیت‌های پایه‌ رزین اپوکسی تقویت شده با نانو صفحات گرافن و لاستیک نیتریل کربوکسیل شده (XNBR) بررسی شده است. نانو صفحات گرافن در سه سطح 0، 0.75 و 1.5 درصد وزنی و لاستیک XNBR در سه سطح 0، 5 و 10 درصد وزنی به زمینه رزین اپوکسی اضافه شدند. نمونه‌ها به روش دستی ساخته و قالب‌گیری شدند و آزمون‌های مکانیکی در دمای محیط جهت تعیین استحکام کششی، مدول کششی، ازدیاد طول تا پارگی و استحکام ضربه انجام شدند. از تصاویر میکروسکوپ الکترونی روبشی (FESEM) جهت مشاهده نحوه‌ی پراکندگی نانو صفحات گرافن در زمینه رزین اپوکسی استفاده شد. مشاهده شد که نانو صفحات گرافن در 0.75 درصد وزنی پراکندگی مناسب داشته و در درصدهای بالاتر دچار کلوخگی شده است. حضور نانو صفحات گرافن باعث کاهش استحکام کششی و ازدیاد طول تا پارگی ترکیبات می‌شود. این درحالی است که حضور نانو صفحات گرافن مدول کششی و استحکام ضربه را به ترتیب 20 و 23 درصد افزایش داده است. از طرف دیگر، افزودن لاستیک XNBR استحکام و مدول کششی را ~18 درصد دچار کاهش و استحکام ضربه و ازدیاد طول تا پارگی را به ترتیب به طور چشمگیری تا 130 و 46 درصد افزایش داده است. همچنین، حضور همزمان نانو صفحات گرافن و لاستیک XNBR در زمینه رزین اپوکسی، کاهش 10 درصدی استحکام کششی را به دنبال داشته است. این در حالی است که مدول کششی، ازدیاد طول تا پارگی و استحکام ضربه به ترتیب نسبت به اپوکسی خالص 6، 29 و 143 درصد افزایش پیدا کرده‌اند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental investigation on mechanical properties of hybrid nano-composite based on epoxy/ graphene nano-platelets/ carboxylated acrylonitrile butadiene rubber

نویسندگان [English]

  • Faramarz Ashenai Ghasemi 1
  • Mohammad Hossein Saberian 2
  • Ismail Ghasemi 3
  • Sajjad Daneshpayeh 4

1 - Faculty of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran

2 - Faculty of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran

3 Department of Materials Science and Engineering, Iran Polymer and Petrochemical Institute, Tehran, Iran

4 - Faculty of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran

چکیده [English]

In this study, mechanical properties of nano-composites based on epoxy reinforced with graphene nano-platelets and XNBR is investigated. Fillers were added to the epoxy matrix in 0, 0.75 and 1.5 wt. % levels for graphene nano-platelets and 0, 5 and 10 wt. % levels for XNBR. Samples were prepared by hand method and mechanical tests were performed in room temperature to determine tensile strength, tensile modulus, elongation at break and impact strength. FESEM images were used to determine the state of graphene nano-platelets dispersion. It was observed that graphene nano-platelets had well dispersion in 0.75 wt.% but in high loading of them, aggregation was observed. Graphene nano-platelets decreased tensile strength and elongation. On the other hand, enhanced tensile modulus and impact strength by 20% and 23%, respectively. Adding XNBR declined tensile strength and modulus by ~18% and increased impact strength and elongation by considerable amount of 130% and 46%, respectively. Simultaneous presence of graphene nano-platelets and XNBR in epoxy matrix decreased tensile strength by ~10%. On the other hand, tensile modulus, elongation and impact strength increased by 6%, 29% and 143% compared to neat epoxy.

کلیدواژه‌ها [English]

  • Mechanical properties
  • epoxy
  • Graphene
  • XNBR

 

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