تأثیر هیبرید نانو رس/دوده بر رفتار پخت، خواص مکانیکی و پسماند نانوکامپوزیت¬های بر پایه‌ی لاستیک استایرن‌بوتادین
محورهای موضوعی : پليمرها و نانوفناوریحمیدرضا حیدری 1 , مرضیه حسینی 2
1 - دانشگاه صنعتی امیرکبیر
2 - پژوهشگاه پلیمر و پتروشیمی ایران
کلید واژه: لاستیک SBR, نانوکامپوزیت, خواص فیزیکی و مکانیکی, پخت, پسماند,
چکیده مقاله :
نانورس به‌دلیل ساختار دوبعدی و نسبت سطح به حجم بالا، باعث ایجاد خواص کششی و رئولوژیکی بسیار خوبی در نانوکامپوزیت می‌شود. فرآورش لاستیک‌ها وابستگی زیادی به فرآیند پخت و کنترل آن، زمان، دما، سرعت ولکانش و سایر شرایط پخت دارد. از میان تمامي روش‌هاي تهیه‌ی نانوکامپوزیت، روش اختلاط مذاب از ساير روش‌ها بيشتر استفاده مي‌شود. به‌طورکلی سه ساختار تکتوئید، میان‌لایه‌ای و پرک‌شده برای نانوکامپوزیت‌ها وجود دارد و خواص نانوکامپوزیت‌ها به‌شدت به پراکنش نانوذره و برهم‌کنش آن‌ها با زمینه وابسته می‌باشد. در این تحقیق به بررسی اثر مقدار نانوپرکننده و شرایط فرآیندی بر رفتار پخت، خواص مکانیکی و پسماند آمیزهی هیبرید بر پایه‌ی SBR و تقویت‌شده با نانورس و دوده تهیه‌شده به روش اختلاط مذاب پرداخته شده‌است. نتایج حاصل از نمودارهای پخت نمونههای نانوکامپوزیت نشان می‌دهد که با افزایش مقدار نانورس، زمان تکمیل پخت کاهش و سرعت پخت افزایش خواهد یافت و افزایش مقدار دوده، منجر به کاهش قابل توجه زمان برشتگی و زمان تکمیل پخت و افزایش قابل توجه سرعت پخت و اختلاط گشتاور می‌شود. هم‌چنین مطابق نتایج آزمون کششی با افزایش مقدار نانوذرات، خواص مکانیکی بهبود یافته‌است و افزایش بیشتر آن موجب افت خواص مکانیکی خواهد شد. نمودارهای پسماند نشان می‌دهند که با افزایش مقدار تقویت‌کنندهها و به‌ویژه دوده، مساحت سطح زیر نمودار تنش-کرنش در حالت بارگذاری-باربرداری به‌طور قابل توجهی افزایش می‌یابد.
Due to its two-dimensional structure and high surface-to-volume ratio, nanoclay creates excellent tensile and rheological properties in nanocomposites. Rubber processing is highly dependent on the curing process and its control, time, temperature, vulcanization rate, and other curing conditions. Among all the methods for preparing nanocomposites, the melt mixing method is used more than other methods. In general, there are three structures for nanocomposites: tactoid, Intercalation, and Exfoliation, and the properties of nanocomposites are highly dependent on the dispersion of nanoparticles and their interaction with the matrix. In this study, the effect of the amount of nanofiller and process conditions on the curing behavior, mechanical properties, and hysteresis of a hybrid blend based on SBR and reinforced with nanoclay and carbon black prepared by melt mixing has been investigated. The results of the curing diagrams of the nanocomposite samples show that with increasing the amount of nanoclay, the curing time will decrease and the curing rate will increase, and increasing the amount of carbon black will lead to a significant reduction in the scorch time and curing time and a significant increase in the curing rate and torque mixing. Also, according to the tensile test results, with increasing the amount of nanoparticles, the mechanical properties have improved, and its further increase will cause a decrease in the mechanical properties. The hystresis diagrams show that with increasing the amount of reinforcements, and especially carbon black, the area under the stress-strain diagram in the loading-unloading mode increases significantly.
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