بررسی اثر محیط توزیع به روش فراصوت روی خواص رئولوژی و ویسکوالاستیک کامپوزیت‌ اپوکسی- نانولوله‌های کربنی چند دیواره

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه نانوفناوری، دانشکده فنی، دانشگاه گیلان، رشت، ایران

2 گروه نانوفناوری،دانشکده فنی دانشگاه گیلان، رشت ،ایران

چکیده

در این مطالعه، تأثیر درصد وزنی نانولوله‌های کربنی چند دیواره (MWCNT) و محیط توزیع کننده نانولوله‌های کربنی به ‌عنوان عامل اصلی برای بررسی خواص رئولوژیکی و ویسکوالاستیک چندسازه‌های اپوکسی/MWCNT استفاده شد. برای توزیع نانولوله‌های کربنی، محیط‌‌های اپوکسی خالص و مخلوط حلال تتراهیدروفوران (THF) و پلیمر اپوکسی مورد استفاده قرار گرفت. کیفیت محیط توزیع‌کننده با استفاده از آزمون‌های رئولوژی، دینامیکی- حرارتی- مکانیکی (DMTA) و میکروسکوپ الکترونی روبشی (SEM) ارزیابی شد. نتایج آزمون رئولوژی نشان داد که مقادیر ′G و G′′ برای چندسازه‌های تولید شده پس از توزیع نانولوله‌های کربنی در محیط اپوکسی/حلال بیشتر از نمونه‌های بدون حلال بوده است. پس از ارزیابی داده‌های DMTA مشخص شد که بیشترین و کمترین مدول ذخیره (ʹE) در حالت شیشه‌ و در دمای ˚C37 برای نانوچندسازه 1-50W22.5RS  و اپوکسی خالص بدست آمده که به ترتیب ‌2855 و‌2100 مگا‌پاسکال بوده است (حدود 36 درصد افزایش برای نانو‌چندسازه). همچنین، نانوچندسازه1- 50W22.5RS نسبت به نمونه‌ای مشابه بدون حلال ، 19% افزایش مدول ذخیره را به همراه داشته است. توزیع 1 درصد وزنی MWCNT در اپوکسی در حضور حلال باعث افزایش 26/5% انرژی فعال‌سازی نانوچندسازه1-50W22.5RS  در مقایسه با نمونه بدون حلال 1-50W22.5R  شد.  رفتار ویسکوالاستیک به وسیله رسم نمودارهای Cole-Cole با استفاده از نتایج آزمایش DMTA مدل‌سازی شده و مدل پرز (Perez) برای تجزیه و تحلیل رفتار ویسکوالاستیک نانوچندسازه‌ها به کار برده شد. نتایج آزمون‌ها و بررسی مدل پرز نشان داد که بهترین خواص رئولوژی و ویسکوالاستیک برای پراکندگی 1 درصد وزنی MWCNT در محیط THF/اپوکسی به دست آمد. از تطابق مدل پرز و داده‌های DMTA نانوچندسازه‌ها، پارامتر 'χ  برای نانوچندسازه1-50W22.5RS  و 1-50W22.5R  به ترتیب 0/47 و 0/55 پیش ­بینی شد. این افت نشان‌دهنده توزیع مناسب نانولوله‌های کربنی در زمینه اپوکسی بوده که با نتایج تصاویر میکروسکوپ الکترونی مطابقت داشته است. 

کلیدواژه‌ها

عنوان مقاله [English]

Investigations of the effect of dispersing medium by ultrasonic method on rheology and viscoelastic properties of epoxy/MWCNT composite

نویسندگان [English]

  • Arash Montazeri 1
  • Mehdi Pazhouhi mojdehi 2
1 University of Guilan-nanotechnology department
2 Nanotechnology department
چکیده [English]

In this study, the effect of the weight percentage of multi-walled carbon nanotubes (MWCNT) and the distribution medium of carbon nanotubes were used as the main factor to investigate the rheological and viscoelastic properties of epoxy/MWCNT composites. To distribute carbon nanotubes, pure epoxy media and a mixture of tetrahydrofuran (THF) solvent and epoxy polymer were used. The quality of the distributor medium was evaluated using rheology, dynamic-thermo-mechanical (DMTA) and scanning electron microscope (SEM) tests. The results of the rheology test showed the values of G and G for the composites produced after distribution of carbon nanotubes in the epoxy/solvent environment were higher than those without solvent. After evaluating the DMTA data, it was found the highest and lowest storage modulus (ʹE) in the glass state and at 37 ℃ for nanocomposite 1-50W22.5RS and pure epoxy were obtained, which were 2855 and 2100 MPa, respectively (about 36% increase for nanocomposite). Also, nanocomposite 1-50W22.5RS, compared to a similar sample without solvent, has increased the storage modulus by 19%. The distribution of 1% by weight of MWCNT in epoxy in the presence of solvent increased the activation energy of nanocomposite 1-50W22.5RS by 26.5% compared to the sample without solvent 1-50W22.5R. The viscoelastic behaviour was modeled by drawing Cole-Cole diagrams using DMTA test results, and the Perez model was used to analyse the viscoelastic behaviour of nanocomposites. The results of tests and analysis of the Perez model showed the best rheological and viscoelastic properties were obtained for the dispersion of 1% by weight of MWCNT in THF/epoxy medium. Comparing Perez's model and DMTA data of nanocomposites, the χ parameter was estimated to be 0.47 and 0.55 for nanocomposites 1-50W22.5RS and 1-50W22.5R, respectively. This decrease indicates the proper distribution of carbon nanotubes in the epoxy field, which is consistent with results of electron microscope images.

کلیدواژه‌ها [English]

  • Multi walled Carbon Nanotubes
  • Viscoelastic
  • Perez model
  • Rheology

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نانومقیاس
دوره 9، شماره 4
دی 1401
صفحه 11-27

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سابقه مقاله

  • تاریخ دریافت: 19 اردیبهشت 1401
  • تاریخ بازنگری: 21 شهریور 1401
  • تاریخ پذیرش: 11 مهر 1401

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