مطالعه خواص آمیخته SBR/ENR50 دارای پرکننده دوتایی نانوخاک‌رس و دوده پخت شده با پرتو الکترونی

نوع مقاله: پژوهشی

نویسندگان

یزد، دانشگاه یزد، پردیس مهندسی، گروه مهندسی شیمی و پلیمر، صندوق پستی741-89195

چکیده

در این پژوهش، نانوکامپوزیت­‌های برپایه آمیخته لاستیکی  SBR/ENR50با ترکیب درصد 50/50 دارای 5 و  10phr نانوخاک­‌رس (کلویزیت15A) و نیز دو نوع تقویت ­کننده نانوخاک­ رس و20phr دوده با روش اختلاط مذاب تهیه شدند. آمیخته­‌های لاستیکی به­ وسیله­ فرایند پرتو الکترونی در دوزهای پرتودهی 50 و 100kGy شبکه­‌ای شدند. برای مقایسه،­ نمونه مرجع با  35phr دوده در سامانه پخت گوگردی معمولی تهیه شد. مقدار ژل­‌شدن نمونه­‌ها با اندازه‌ گیری کسر ژلی مشخص شد. نتایج نشان داد، نمونه­ دارای 5phr نانوخاک­‌رس و20phr دوده دارای بیشترین مقدار کسر ژلی است. خواص دینامیکی- مکانیکی شامل مدول ذخیره، مدول اتلاف و ضریب اتلاف نمونه‌­ها با استفاده از آزمون دینامیکی- مکانیکی (DMA) ارزیابی شد. نتایج نشان داد، گرچه پراکنش مناسب در نمونه­ دارای  10phr نانوخاک­‌رس و20phr دوده وجود دارد. اما، کاهش بیشینه ضریب اتلاف در نمونه­ دارای 5phr نانوخاک­رس و20phr دوده در دوز پرتودهی 100kGy نسبت به نمونه مرجع مشهود است. در حالی که مدول ذخیره نمونه مرجع از این نمونه بیشتر است. خواص مکانیکی مانند استحکام کششی، تنش در ازدیاد طول‌های 200،100 و %300 و درصد ازدیاد طول نمونه‌­ها با استفاده از دستگاه کشش ارزیابی شد. نتایج خواص مکانیکی شامل افزایش استحکام کششی و تنش در ازدیاد طول­‌های مختلف در نمونه دارای 5phr نانوخاک­‌رس و 20phr دوده نسبت به نمونه مرجع نتایج پیشین را تأیید کرد. در تصاویر SEM مربوط به نمونه­‌های دارای دو پرکننده دوده و نانوخاک­‌رس در دوز پرتودهی 100kGy زبری سطح بیشتری مشاهده شد.

کلیدواژه‌ها


عنوان مقاله [English]

The Properties of SBR/ENR50 Blend Containing Nanoclay/Carbon Black Dual Filler System Cured by Electron Beam

نویسندگان [English]

  • Sima Ahmadi-Shooli
  • Mitra Tavakoli
Department of Chemical and Polymer Engineering, Faculty of Engineering, Yazd University, P.O. Box: 89195-741, Yazd, Iran
چکیده [English]

Nanocomposites based on an SBR/ENR50 rubber blend with the blend ratio of 50/50 using Cloisite 15A nanoclay (5 and 10 phr)) and carbon black (20 phr) were prepared by melt mixing process. The rubber compounds were crosslinked by electron beam irradiation process at 50 and 100 kGy doses. A reference sample containing carbon black at 35 phr was prepared using a conventional sulphur curing system. The gel content of the samples was specified using gel fraction measurement. The results showed the maximum gel content for the sample having 5 phr nanoclay and 20 phr carbon black. The dynamic mechanical properties, including the storage modulus, loss modulus, and loss factor, of the nanocomposites were evaluated using dynamic mechanical analysis (DMA) tests. The results indicated that, in spite of a well dispersed nanoclay in samples containing 10 phr nanoclay and 20 phr carbon black, a minimum loss factor was observed in the sample containing 5 phr nanoclay and 20 phr carbon black at 100 kGy. On the other hand, the storage modulus of the reference sample was found to be higher than that of the sample with 5 phr nanoclay and 20 phr carbon black. The mechanical properties, including the tensile strength, stress at 100%, 200%, and 300% elongation and the percentage of elongation were measured by a tensile machine. The results showed an increase in tensile strength and the stress at different elongations for a sample with 5 phr nanoclay and 20 phr carbon black compared to the reference sample. In the corresponding SEM images of the samples having nanoclay and carbon black irradiated at 100 kGy a significantly higher surface roughness was observed.

کلیدواژه‌ها [English]

  • epoxidized natural rubber
  • styrene butadiene rubber
  • carbon black
  • Nanoclay
  • electron beam
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