بهینه سازی خواص مکانیکی فوم‌های پلی پروپیلن تولید شده با اکسترودر

عظیمی, حمیدرضا; جهانی, داود; محبی فر, امین; یزدان پناه, محمدرضا

بهینه سازی خواص مکانیکی فوم‌های پلی پروپیلن تولید شده با اکسترودر

نوع مقاله : پژوهشی اصیل

نویسندگان

حمیدرضا عظیمی ¹

داود جهانی ²

امین محبی فر ³

محمدرضا یزدان پناه ²

¹ دانشگاه شهید مدنی آذربایجان

² دانشگاه بناب

³ داشگاه مراغه

چکیده

فومهای پلاستیکی خوب طراحی شده از نقطه نظر چگالی سلولها و اندازه آنها ، باز یا بسته بودن و یکنواخت بودن سلولها، در کنار داشتن امتیاز هایی از قبیل مصرف مواد کمتر، ثبات ابعادی بالاتر، فرایندپذیری بهتر و کیفیت سطح مطلوبتر نسبت به پلاستیک های فوم نشده متناظر خود، می توانند خواص مکانیکی و فیزیکی برتری، مانند استحکام به وزن، استحکام به ضربه، خواص حرارتی و دی الکتریکی داشته باشند. چگونگی توزیع دما در نواحی مختلف اکسترودر، کمیت و کیفیت نانوذرات افزودنی و چگونگی توزیع آنها در زمینه پلیمر می توانند تاثیر چشمگیری در خصوصیات مکانیکی فوم های اکسترودر داشته باشند. در این تحقیق با استفاده از دستگاه اکسترودر، فوم‌های میکروسلولی پلی پروپیلن گرافت شده با مالئیک انیدرید با افزودن 3، 7 و 9% وزنی نانو رس اصلاح سطح شده، در سه شرایط دمایی اکسترودر تولید و اثر مواد و فرایندها در خواص مکانیکی مورد تحقیق قرار گرفت. نتایج نشان می دهد که افزودن نانو رس موجب بهبود خواص مکانیکی فوم پلی پروپیلن گرافت شده با مالئیک انیدرید می شود. به عنوان مثال، نتایج نشان می دهد نمونه های درست شده حاوی 7% رس اصلاح شده سطحی، حدود 10 درصد مقاومت به ضربه یی بیشتری نسبت به نمونه های بدون نانو رس دارا می باشند. همچنین برای همین نمونه ها افزایش حدود 5 درصدی در مدول یانگ نسبت به سایر نمونه ها ثبت شده است. همچنین بررسی های ریزساختاری نمونه‌ها با استفاده از میکروسکوپ الکترونی روبشی، نشان دهنده‌ی این است که افزودن نانو رس موجب یکنواخت شدن ساختار فوم و سلول های ریزتر می شود. در این تحقیق، کمترین اندازه متوسط سلولها (5/87 میکرومتر) و پایین ترین دانسیته فوم (3/0 گرم بر سانتی متر مکعب) برای نمونه حاوی 7% رس که در حالت کاری دو تولید شده بود ثبت گردید.

کلیدواژه‌ها

اکسترودر

پلی پروپیلن گرفت شده با مالئیک انیدرید

خواص مکانیکی

نانو رس

نانو کامپوزیت

موضوعات

کامپوزیت

عنوان مقاله English

Optimization of mechanical properties of PP-polymer foam fabricated via extruder

نویسندگان English

Hamidreza Azimi ¹

dAVOUD jAHANI ²

AMIN Mohebifar ³

Mohamad reza Yazdan panah ²

¹ دانشگاه شهید مدنی آذربایجان

² دانشگاه بناب

³ داشگاه مراغه

چکیده English

Research subject:Well-designed plastic foams, with respect to their cell density and cell size, open-or-close cells, and the cell uniformity, compared to their counterpart unfoamed plastic parts, beside of having the advantages of less material consumption, dimensional stability, better processability, and a higher surface quality, they can have superior mechanical and physical properties, including strength to weight, impact strength, thermal and dielectric properties. The temperature distribution in the different zones of the extruder, the qualities and quantities of the nanoparticle additives and their dispersion in the polymer matrix can have significant effect on the mechanical properties of the produced foams by the extruder.

Research approach: In this study, using an extruder, MA-g-polypropylene microcellular foams, containing 3, 7 and 9 wt% of nano-clay particles, were produced under three temperature arrangements on the extruder and the material and the processing effects on the mechanical properties were investigated.

Main results: The result of this investigation shows that adding of nanoclay improves the mechanical properties of MA-g-PP.s foams. As an example, the results show that the sample with 7 wt% of surface modified nanoclay, owns about 10% higher impact toughness compared to the samples produced without nanoclay. Also for the same samples a rise of about 5% was recorded in Young's modulus. The microstructural studies of the produced foams by scanning electron microscope (SEM) show that adding of nanoclay can result on more foam uniformity and smaller cell size. In this study, the smallest average cell size (87.5 μm) and the lowest density (0.3 g/cm³) were recorded for a sample with 7wt% nanoclay.

کلیدواژه‌ها English

Extruder

MA-g-polypropylene

Mechanical

Properties

Nanoclay

Nanocomposites

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