نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجو، مهندسی مواد-نانومواد، دانشگاه شیراز، شیراز، ایران

2 استاد، مهندسی مواد، دانشگاه شیراز، شیراز، ایران

10.22068/jstc.2018.78397.1410

چکیده

در این پژوهش به بررسی تاثیر اندازه و نوع ساختار نانوذرات سیلیکا بر مورفولوژی ساختاری نمونه‌های اسفنج منعطف پلی‌یورتان و همچنین به بررسی رفتار کششی آن‌ها پرداخته شد. بدین منظور نانوذرات سیلیکا با دو ساختار مختلف توپر و توخالی و میانگین اندازه‌ ذرات 40 nm و 150 nm تهیه گشتند و به عنوان فاز تقویت‌کننده در زمینه اسفنج منعطف پلی‌یورتان با درصدهای وزنی مشابه 0.1،0.2 و 0.3 پخش گردیدند و نمونه‌های نانوکامپوزیتی ساخته شدند. در ادامه به مقایسه و بررسی ساختار این دو گروه از نانوکامپوزیت‌ها با یکدیگر و نمونه خالص توسط میکروسکوپ الکترونی روبشی (SEM) پرداخته شد و تاثیر ساختار نمونه بر رفتار کششی آن‌ها بررسی شد. نتایج حاصل از SEM نشان می‌داد که در درصدهای وزنی مشابه از فاز تقویت‌کننده، اندازه و تعداد سلول‌های تشکیل شده در نانوکامپوزیت‌ پلی‌یورتان- نانوذرات توپر سیلیکا نسبت به نانوکامپوزیت پلی‌یورتان- نانوذرات توخالی سیلیکا و نمونه پلی‌یورتان خالص بیشتر می‌باشد. همچنین نتایج آزمون کشش نشان داد که با افزایش درصد وزنی فاز تقویت‌کننده در زمینه اسفنج پلی‌یورتان، استحکام کششی نسبت به نمونه خالص بهبود و درصد ازدیاد طول کاهش پیدا کرده است. بعلاوه افزایش خواص کششی با تعداد و اندازه سلول‌های شکل گرفته رابطه مستقیمی دارد. به طوری‌که نانوکامپوزیت‌های تقویت‌شده با نانوذرات توپر و نانوذرات توخالی سیلیکا در 0.3% وزنی، استحکام کششی به ترتیب حدود %78 و %34 افزایش و درصد ازیاد طول نیز به ترتیب حدود 44% و 30% نسبت به نمونه خالص کاهش پیدا کرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effects of size and structure of silica nanoparticles on morphology and tensile behavior of flexible nanocomposite foams based on polyurethane

نویسندگان [English]

  • zohreh zangiabadi 1
  • Mohammad Jafar hadianfard 2

1 Department of the materials engineering, Shiraz University, Shiraz, Iran

2 Department of the materials engineering, Shiraz University, Shiraz, Iran.

چکیده [English]

In this research, the effect of size and type of silica nanoparticle structure on the morphology and tensile behavior of flexible polyurethane foams were investigated. For this purpose, silica nanoparticles were prepared with two structures rigid and hollow with average particle size of 40 and 100 nm respectively, and reinforcement phases were dispersed in the matrix of flexible polyurethane foam with weight percentages of 0.1, 0.2 and 0.3. Then, comparison and investigation of nanocomposite and pure samples were studied by scanning electron microscopy (SEM) and the effect of structure on the tensile behavior examined. The results of the SEM shown that among all of the samples, polyurethane/rigid silica nanocomposites have more than the size and number of cells. Also, the results of the tensile test shown that by increasing weight percentage of the reinforcement phase in the matrix, the tensile strength were increased and elongation at break were decreased. The addition, there was direct relationship with tensile properties and size and number of cells. So that, the nanocomposite reinforced with rigid and hollow silica nanoparticles at 0.3% wt, increased tensile strength by 78% and 34%, and decrease the elongation at break by 44% and 30%, respectively, relative to the pure sample.

کلیدواژه‌ها [English]

  • nano composite
  • Tensile behavior
  • Silica Nanoparticles
  • hollow silica nanospheres

 

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