اثر نانوصفحه‌های گرافن بر خواص رئولوژی و کششی و رفتار پخت نانوکامپوزیت‌های برپایه آمیخته‌های NBR/PVC تهیه شده با روش اختلاط مذاب

نوع مقاله: پژوهشی

نویسندگان

1 تهران، پژوهشگاه پلیمرو پتروشیمی ایران، پژوهشکده فرایند، گروه لاستیک، صندوق پستی 112-14975

2 تهران، دانشگاه پیام نور، بخش فنی مهندسی، دانشکده مهندسی شیمی، گروه مهندسی پلیمر، صندوق پستی 3697-19395

چکیده

در این پژوهش، اثر نانوگرافن بر خواص پخت، کششی و رهایی از تنش نانوکامپوزیت‌های بر پایه آمیخته NBR/PVC با نسبت درصد 30/70 و لاستیک آکریلونیتریل بوتادی‌ان با دو مقدار زیاد %45 و متوسط %33 از آکریلونیتریل بررسی شد. نمونه‌ها با روش اختلاط مذاب تهیه شدند و همان‌طور که انتظار می‌رفت، با افزودن نانوگرافن به آمیخته‌ها، گشتاور پخت افزایش یافت. همچنین، زمان برشتگی (ایمنی) و زمان پخت بهینه به دلیل ممانعت فضایی صفحه‌های نانوگرافن و ایجاد تأخیر در پخت، افزایش شایان توجهی نشان داد. منحنی‌های پخت حاکی از اثر درخور توجه درصد آکریلونیتریل (ACN) بر خواص نانوکاموزیت‌های تهیه‌شده بود، به‌طوری که در نانوکامپوزیت‌های دارای درصد زیاد آکریلونیتریل، گشتاور بیشینه پخت، زمان برشتگی و زمان پخت بهینه افزایش یافت. در ادامه، در آزمون رهایی از تنش مشاهده شد، افزایش مقدار نانوگرافن، مدول اولیه را افزایش می‌دهد و سبب کاهش مدول نهایی نمونه‌ها در حالت پیش و پس از پخت می‌شود. همچنین، در نمونه‌های با درصد زیاد ACN، مدول اولیه و نهایی در آزمون رهایی از تنش مقادیر بیشتری را نشان می‌دهد. با افزایش مقدار نانوگرافن و استفاده از نمونه‌های با درصد زیاد ACN، شیب نواحی کوتاه و بلندمدت نمونه‌ها در آزمون رهایی از تنش، افزایش یافت. خواص کششی نمونه‌ها شامل استحکام کششی، ازدیاد طول تا پارگی و مدول یانگ با افزایش مقدار نانوگرافن افزایش یافت. در ادامه، خواص کششی نمونه‌ها در سه دمای مختلف 25، 50 و 75 درجه سانتی‌گراد بررسی و مقایسه شد. نتایج اثر دما بر خواص کششی نانوکامپوزیت بیانگر این است که با افزایش غلظت نانوگرافن، کاهش استحکام کششی و مدول یانگ با افزایش دما، نسبت به نمونه بدون نانوذرات بسیار کمتر است.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Graphene Nanoplatelets on Rheology, Tensile Properties and Curing Behavior of Nanocomposites Based on NBR/PVC Blends Prepared by Melt Intercalation Method

نویسندگان [English]

  • Mohammad Barghamadi 1
  • Mohammad karrabi 1
  • Mir Hamid Reza Ghoreishy 1
  • Somayyeh Mohammadian-Gezaz 2
1 Department of Rubber, Faculty of Polymer Processing, Iran Polymer and Petrochemical Institute, P.O. Box: 14975-112, Tehran, Iran
2 Polymer Engineering Group, Department of Chemical Engineering, Payame Noor University, P.O. Box: 19395-3697, Tehran, Iran
چکیده [English]

Hypothesis: Various properties of NBR depend extremely on acrylonitrile (ACN) content of rubber formulation. One of the regular blends of NBR is NBR/PVC. Moreover, as it is widely known nanographene, due to its high specific surface area, is a performance material for producing polymer nanocomposites and for improving thermal and mechanical properties. To study the effect of nanographene on curing, tensile and stress relaxation properties of nanocomposites is interesting and important in practical terms and quality. The hypothesis of this research is to demonstrate the effect of temperature on the physico-mechanical of nanocomposites filled with various amounts of nanographene.
Methods: NBR/PVC/nanographene nanocomposites were prepared using NBR/PVC blends with a ratio of 70/30 and acrylonitrile butadiene rubber at acrylonitrile contents of 33% and 45%, incorporated with 0.5, 1.0 and 1.5 phr of nanographene by melt intercalation method using a two roll mill. PVC of 30 phr was mixed with the above compounding formulations in an internal mixer. The TEM images, tensile properties and RPA results (curing and stress relaxation behavior) were obtained and compared. The effect of temperature (25, 50, 75°C) on tensile properties was also studied.
Findings: Nanographene increased the maximum curing torque, scorch time and curing time. Samples containing higher ACN percentage, showed higher maximum curing torque, scorch time and optimum cure time. In the stress relaxation test, it was observed that the increase in the amount of nanographene increased the initial modulus and reduced the final modulus of the nanocomposites in the uncured and cured states. In formulations with high CAN content, the initial and final moduli showed higher values. By increasing the nanographene content and formulations with higher CAN content, higher elastic and viscous slopes were observed. The tensile properties of nanocomposites, including tensile strength, elongation and modulus were increased by higher amount of nanographene. In addition, the tensile properties of nanocomposites at three different temperatures of 25, 50 and 75°C were investigated and compared. With increasing nanographene concentration and rising temperature, samples showed a much lower reduction in tensile strength and Young's modulus than those in unfilled sample.

کلیدواژه‌ها [English]

  • NBR/PVC based nanocomposite
  • nanographene
  • acrylonitrile content
  • curing
  • stress relaxation
  • tensile behaviour with temperature
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