خواص رئولوژی پراکنه ‌آبی نانوکامپوزیت برپایه‌ ‌پلی‌(آکریل‌آمید-کو-آکریلیک‌اسید) و نانولوله‌کربن

نوع مقاله: پژوهشی

نویسندگان

1 تهران، دانشگاه آزاد اسلامی، واحد تهران جنوب، دانشکده علوم پایه، گروه شیمی کاربردی، صندوق پستی 17776-13651

2 تهران، دانشگاه صنعتی شریف، گروه علوم و مهندسی مواد، صندوق پستی 9466-11365

چکیده

نانولوله‌های‌کربن (CNT) دسته جدیدی از نانومواد هستند که به‌دلیل خواص منحصربه‌فرد آن‌ها مثل خواص الکتریکی و مکانیکی در کاربردهای مختلف اساسی مورد توجه واقع شده‌اند. هیدروژل‌های نانوکامپوزیتی، دسته نوینی از هیدروژل‌ها هستند که ساختار منحصربه‌فرد و استحکام مکانیکی زیادی دارند. همچنین در صنعت و پژوهش‌های علمی بسیار مورد توجه قرارگرفته‌اند. این دسته شامل پلیمر و نانوذرات غیرآلی مثل نانوخاک‌رس، نانولوله کربن، ذرات آهن و پراکسیدهای گرافن هستند که باید به ‌شکل همگن در ماتریس پلیمری پراکنده شوند. پراکنه ‌آبی نانوکامپوزیتی برپایه پلی‌‌(آکریل‌آمید-کو-آکریلیک اسید) و نانولوله‌کربن اصلاح‌شده،‌ به‌ روش پلیمرشدن درجای رادیکالی سنتز شد. آب جایگزین مناسبی به‌جای حلال‌های آلی سمی فرمامیدی برای ساخت پراکنه‌های آبی نانوکامپوزیتی CNT/ (AA-co-AMM)poly هستند. خواص رئولوژی نانوکامپوزیت‌ها، افزایش چشمگیری نسبت به کوپلیمر خالص نشان داد. برای پراکنش بهتر و برهم‌کنش مناسب نانوذرات با پایه پلیمری، نانولوله‌‌های‌کربن با اسید اصلاح شدند و گروه‌های هیدروکسیل وکربوکسیل روی آن‌ها نشانده شد. پس از مرحله اکسایش، از واکنش آمین‌دارکردن برای نشاندن گروه‌های آمیدی روی ذرات CNT استفاده شد. واکنش اصلاح سطح ذرات نانولوله کربن با روش‌های طیف‌سنجی‌های زیرقرمز تبدیل فوریه و رامان بررسی شد. برای بررسی پراکنش نانوذرات از طیف‌سنجی رامان و نیز برای تأیید پیوند نانوذرات به پلیمر از طیف‌سنجی زیرقرمز تبدیل فوریه استفاده شد. سپس، بررسی رئولوژی شامل رفتار گرانروکشسانی نمونه‌ها، انتقال سل به ژل، روبش بسامد نوسانی دینامیکی و برش پایا انجام شد. درنهایت، سازوکار افزایش خواص رئولوژی (مدول و گرانروی) براساس ریزساختار پراکنش نانوذرات، تشکیل شبکه و نیز برهم‌کنش‌های سطحی بین زنجیرهای پلی‌آکریل آمید و نانوذرات CNT مشخص شد.

کلیدواژه‌ها


عنوان مقاله [English]

Rheological Properties of Nanocomposite Aqueous Dispersions Based on Poly(acrylamide-co-acrylic acid) and Carbon Nanotube

نویسندگان [English]

  • Mohammad Reza Manafi 1
  • Pedram Manafi 1
  • Gholamreza Pircheraghi 2
1 Department of Applied Chemistry, Islamic Azad University, South Tehran Branch, P.O. Box: 17776-13651, Tehran, Iran,
2 Department of Materials Science and Engineering, Sharif University of Technology, P.O. Box:11365-9466, Tehran, Iran
چکیده [English]

Carbon nanotubes (CNTs) are a new class of nanomaterials that have gained special attention due to their unique properties such as excellent electrical and mechanical properties. Nanocomposite hydrogels, a novel category of hydrogels, have received great attention both in industry and scientific research because of their exceptional structural and mechanical properties. A nanocomposite aqueous dispersion based on poly(acrylamide-co-acrylic acid) and modified carbon nanotube was synthesized through in situ radical polymerization. Water can be a good candidate instead of toxic organic solvents for preparation of poly(AA-co-AM)/CNT nanocomposite aqueous dispersions. The rheological properties of the nanocomposites were significantly improved compared to those of pure copolymer samples. Modification of carbon nanotubes by acid was conducted to introduce hydroxyl and carboxyl groups on their surface in order to achieve a better dispersion behavior and suitable interactions between the nanoparticles and polymer matrix. Once the oxidation step was finished, amide functional groups were inserted into the CNT particles through amidation reaction. The surface modification reactions of CNT were tracked by FTIR and Raman spectroscopy techniques. FTIR and Raman spectra were utilized in order to investigate the dispersion behavior of nanoparticles and to confirm the formation of linkages between the nanoparticles and polymer matrix, respectively. In addition, the rheological features including viscoelastic behavior of samples, the sol-gel transition phenomenon, dynamic oscillatory frequency sweep and steady shear measurements were studied. Finally, the relationship between the improved rheological properties (modulus and viscosity) and the dispersion microstructures caused by dispersion of nanoparticles, formation of networks and interfacial interactions between Poly(AA-co-AM) macromolecular chains and CNT nanoparticles were determined.

کلیدواژه‌ها [English]

  • poly(acrylamide -co-acrylic acid)
  • functionalized carbon nanotube
  • radical insitu polymerization
  • Rheology
  • water

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