نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد،مهندسی مکانیک،دانشگاه سمنان،سمنان.

2 استاد،مهندسی مکانیک،دانشگاه سمنان، سمنان.

3 دانشیار، مهندسی مکانیک، دانشگاه دامغان، دامغان.

4 استادیار، مهندسی مکانیک، دانشگاه شهید بهشتی، تهران.

10.22068/jstc.2023.1982818.1817

چکیده

پژوهش حاضر به مطالعه اثر افزودن نانوذرات پرلیت و لاستیک طبیعی با درصد‌های وزنی مختلف بر مدول کششی و استحکام ضربه‌ای پلی پروپیلن پرداخته است. برای این منظور، نمونه‌های مختلف با استفاده از دستگاه مخلوط کن داخلی بر اساس استانداردهای آزمون‌های کشش و ضربه تولید و تست شدند. همچنین با کمک روش بهینه سازی پاسخ سطح (RSM)، نقش پارامتر‌های ورودی بر پاسخ‌ها در جهت دست یابی به خواص مکانیکی بهینه و پیش بینی این خواص با مدل‌های ریاضی در قالب طرح پنج سطحی مرکب مرکزی (CCD) مورد بررسی قرار گرفت. بعلاوه، از آزمون -SEM به جهت مشاهده تغییرات ایجاد شده در ریز ساختار نمونه‌ها بهره گرفته شد. نتایج نشان داد، افزودن7 wt.% از نانوذرات پرلیت به ماتریس حاوی20 wt.% از لاستیک طبیعی، مقدار مدول کششی را 11.27% افزایش و استحکام ضربه‌ای را 52.01% نسبت به افزودن 3 wt.% از نانوذرات پرلیت به همان ماتریس کاهش می‌دهد. نتایج بهینه سازی چند متغیره اثبات کرد که درصد وزنی بهینه نانوذرات پرلیت و لاستیک طبیعی به ترتیب 4.04 و 35.26 wt.% بود. در این صورت بیشترین مقدار حاصل شده برای مدول کششی 508.04 MPa و استحکام ضربه‌ای‌ 108.52 J/m تعیین شد. با مشاهده تصاویر SEM استنباط شد که تغییر در اندازه فاز الاستومری به جهت استفاده از درصد‌های وزنی گوناگون تقویت کننده، باعث متفاوت شدن نتایج خواص مکانیکی نمونه‌ها با یکدیگر شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of perlite nanoparticles addition on the mechanical and microstructure properties of PP/NR blend fabricated by melt mixing processing: Optimizing by Response Surface Approach

نویسندگان [English]

  • Hadi Soleymani 1
  • Abdolhossein Fereidoon 2
  • Alireza Albooyeh 3
  • Mohammad Reza Nakhaei 4

1 Faculty of Mechanical Engineering, Semnan University, Semnan, Iran.

2 School of Engineering, Damghan University, Damghan, Iran.

3 School of Engineering, Damghan University, Damghan, Iran.

4 Faculty of Mechanics and Energy, Shahid Beheshti University, Tehran, Iran.

چکیده [English]

The present research has studied the effect of adding perlite and natural rubber nanoparticles with various weight percentages on the tensile modulus and impact strength of polypropylene. For this purpose, different samples were produced and tested using an internal mixer based on the standards of tensile and impact tests. Also, by using of response surface methodology (RSM), the role of input parameters on the responses was investigated in order to achieve optimal mechanical properties and predict these properties with mathematical models in the form of central composite five-level design (CCD). In addition, the SEM test was used to observe the changes made in the microstructure of the samples. The results showed that the addition of 7 wt.% of pearlite nanoparticles to the matrix containing 20 wt.% of natural rubber, the value of the tensile modulus increased by 11.27% and the impact strength by 52.01% compared to the addition of 3 wt.% of pearlite nanoparticles to the same matrix. The results of multiobjective optimization proved that the optimal weight percentage of pearlite nanoparticles and natural rubber was 4.04 and 35.26% wt. respectively. Is. In this case, the highest value obtained for tensile modulus was 508.04 MPa and impact strength was determined to be 108.52 J/m. By observing the SEM images, it was concluded that the change in the size of the elastomeric phase due to the use of different weight percentages of reinforcements has caused the results of the mechanical properties of the samples to differ from each other.

کلیدواژه‌ها [English]

  • Polypropylene
  • Natural rubber
  • Perlite
  • Nanocomposite
  • Response surface methodology
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