نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشکده مهندسی مواد، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

2 دانشیار، دانشکده مهندسی مواد، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

3 کارشناسی ارشد، دانشکده مهندسی مواد، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

چکیده

در تحقیق حاضر، تاثیر افزودن نانولوله‌های کربنی بر رفتار کششی و خمشی کامپوزیت‌های زمینه اپوکسی تقویت‌شده با الیاف بازالت بررسی شد. در گام نخست و به‌منظور برهم‌کنش مطلوب‌تر نانولوله‌ها با زمینه اپوکسی، اصلاح سطحی آن‌ها به وسیله عامل تری گلیسیداکسی پروپیل تری متوکسی سیلان صورت گرفت که در ادامه ایجاد گروه‌های عاملی روی سطح نانولوله‌های کربنی به‌وسیله آزمون طیف‌سنجی مادون قرمز (FTIR) تایید شد. نانولوله‌های کربنی اصلاح‌ سطحی‌شده در درصدهای وزنی مختلف نسبت به زمینه (0، 1/0، 3/0 و 5/0 درصد) و از طریق روش‌های همزدن مکانیکی و آلتراسونیک در زمینه پخش شدند و در ادامه مخلوط‌های حاصله به‌عنوان زمینه در ساخت کامپوزیت‌های تقویت‌شده با الیاف بازالت استفاده شد. به‌منظور بررسی اثر افزودن نانولوله‌های کربنی بر رفتار مکانیکی کامپوزیت‌ها آزمون‌های کشش و خمش سه‌نقطه‌ای روی آن‌ها صورت پذیرفت. همچنین برای بررسی مکانیزم شکست کامپوزیت‌ها از میکروسکوپ روبشی الکترونی گسیل میدانی (FESEM) استفاده شد. نتایج به‌دست آمده نشان داد که بیشترین میزان بهبود در خواص استحکام کششی، استحکام خمشی و همچنین جذب انرژی مربوط به نمونه حاوی 3/0 درصد وزنی نانولوله کربنی بود و از طرفی مدول کششی و خمشی نمونه‌ها با افزودن نانولوله‌ها روند افزایشی از خود نشان دادند. بررسی‌های میکروسکوپی موید این واقعیت بودند که افزودن نانولوله‌های کربنی چندجداره در زمینه باعث بهبود خواص فصل مشترکی بین الیاف بازالت و زمینه نانوکامپوزیتی شده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

An experimental study on mechanical properties of epoxy/basalt/carbon nanotube composites under tensile and flexural loadings

نویسندگان [English]

  • Hamed Khosravi 1
  • Reza Eslami-Farsani 2
  • Hossein Ebrahimnezhad-Khaljiri 3

1 Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran

2 -Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran

3 Department of Materials Engineering, University of Sistan and Baluchestan, Zahedan, Iran

چکیده [English]

This work details an experimental investigation on understanding the effects of multi-walled carbon nanotubes (MWCNTs) on the tensile and flexural properties of basalt fiber (BF)/epoxy laminated composites. As a first step, the surface of MWCNTs was modified with a silane coupling agent namely 3-Glycidoxypropyltrimethoxysilane (3-GPTS). Fourier transform infrared (FT-IR) data confirmed the reaction mechanism between the silane compound and MWCNTs. 3-GPTS/MWCNTs with various loadings (0, 0.1, 0.3 and 0.5 wt.%) were added to the epoxy resin via mechanical and ultra-sonication routes. The resultant mixtures were then utilized to fabricate MWCNT/woven BF/epoxy nanocomposites using hand-layup technique. Mechanical properties of the composites were investigated under tensile and flexural loadings. Also, a field-emission scanning electron microscope (FESEM) was used to study the distribution level of MWCNTs in the matrix as well as the fracture surfaces of the specimens. The results revealed that at filler loading 0.3 wt.% of 3-GPTS/MWCNTs, maximum improvements in  tensile and flexural strengths and energy absorption of the BF/epoxy composites were obtained. Besides, the flexural and tensile moduli were enhanced continually by increasing the MWCNTs content. The microscopic investigations verified this subject that the addition of the 3-GPTS/MWCNTs to the matrix of BF/epoxy composite improves the BF-matrix interface yielding enhanced mechanical properties

کلیدواژه‌ها [English]

  • Polymer matrix composites؛ Basalt fibers؛ Multi-walled carbon nanotubes؛Surface modification
  • Tensile and flexural tests
 
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