علوم و فناوری کامپوزیت

نانو/ میکرو کامپوزیت‌های فوم پلی یورتان/پلی اوره تقویت شده با زئولیت طبیعی/نانوذرات گرافیت مقاوم به شعله

نوع مقاله : مقاله پژوهشی

نویسندگان

1 هیات علمی دانشکده مهندسی مکانیک-دانشگاه صنعتی اصفهان

2 دانشکده مهندسی مکانیک، دانشگاه صنعتی اصفهان، اصفهان، ایران

10.22068/jstc.2022.546600.1766

چکیده

کامپوزیت های پلیمری پایه نفتی می توانند عامل گسترش اشتعال علیرغم کاربردهای متعدد خود باشند. تحقیقات انجام شده بر روی اشتعال‌پذیری و خواص ضد حریق کامپوزیت‌ها در مقایسه با مطالعات خواص مکانیکی آنها ناچیز بوده که بیانگر اهمیت پرداختن به خواص چندمنظوره کامپوزیت ها با خواص مقاومت در برابر آتش است. در این تحقیق پلی یورتان دو جزئی با زئولیت طبیعی و نانوصفحات گرافیتی به منظور بررسی مقاومت به آتش و خواص بهینه مکانیکی فوم های کامپوزیتی ترکیب شد. همچنین ترکیب پلی یورتان با پلی اوره بنابر فرضیه مطالعه با درصد بهینه 40% به صورت کامپوزیت ترکیبی هم‌پایه بررسی شد. نتایج نشان داد میکرو/نانوکامپوزیت های تقویت شده زئولیت و نانوصفحات گرافیتی به ترتیب منجر به افزایش مدول یانگ کششی معادل 200 و 300% شده و افزودن زئولیت باعث افزایش استحکام در کشش کامپوزیت های می شود. آزمایشات نشان داد مدول خمشی نیز با افزودن دو فیلر افزایش می یابد. به منظور افزایش خواص مکانیکی، پارچه الیاف شیشه به کامپوزیت ترکیبی پلی یورتان/پلی اوره با خواص بهینه لایه گذاری شد که منجر به افزایش 600 و 200 درصدی مدول یانگ خمشی در حالت دولایه شد. روکش پلی اوره روی کامپوزیت ها با درصد بهینه نشان داد که نرخ سوختن تا 23 میلیمتر بر دقیقه کاهش یافته و مدت سوختن طبق استاندارد UL94 معادل 200 ثانیه گردید. کامپوزیت پلی یورتان/پلی اوره تقویت شده با زئولیت 2 درصد وزنی منجر به نرخ سوختن 4.9 میلیمتر بر دقیقه شده که در دامنه مجاز 80 درصد کمتر از حداکثر نرخ ممکن در استاندارد است.

کلیدواژه‌ها

عنوان مقاله [English]

Fire resistance polyurethane/poly Urea micro/Nanocomposite foams reinforced with natural zeolite/Graphite nanoplatelets (GNP)

نویسندگان [English]

  • Mehdi Karevan 1
  • Marzieh Fallah 2

1 Faculty member- Mechanical Eng. Dept. Isfahan Univ. of Technology

2 Mechanical Eng. Department,, Isfahan University of Technology,,, Isfahan, Iran

چکیده [English]

Petroleum based polymer composites could be a factor in the development of fire unlike their numerous applications. The research performed on the fire resistance and flammability of composites is not comparable with those conducted on the mechanical behavior of composites demonstrating the importance of studying multi-functional composites of fire resistance behavior. In this work, two-part polyurethane was reinforced with natural zeolite and graphite nanoplatelets (GNP) to examine fire resistance and optimized mechanical behavior of the composite foams. Moreover, poly urea was added with the optimized ratio of 40% into polyurethane composites based on the study hypothesis. The results showed that zeolite and GNP filled nano/microcomposites led to a 200 and 300% improvement in the tensile modulus of the composites, respectively. It was further sown that both fillers resulted in enhancement in the flexural modulus, too. To enhance the mechanical behavior, fiber glass mat was laminated with the optimized polyurethane/poly urea compound leading to a 600 and 200% improvement in the flexural modulus, respectively, in the case of two-layer reinforcement. The poly urea coating on the optimized composite specimens demonstrated the reduced burning rate of 23 mm/min and a 200 s flame time based on the UL94 standard. The mixed compound of polyurethane/poly urea filled with 2 wt% of zeolite led to the burning rate of 4.9 mm/min being in the allowable range above 80% lower than the maximum possible rate set forth in the standard.

کلیدواژه‌ها [English]

  • Mechanical properties
  • Polyurethane foam
  • Fire resistance
  • Natural zeolite
  • Poly urea
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علوم و فناوری کامپوزیت
دوره 8، شماره 3
آذر 1400
صفحه 1725-1715
فایل ها
هم رسانی
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