بررسی ویژگی‌های مکانیکی کامپوزیت ساخته شده از پلی‌پروپیلن و آرد چوب کنوکارپوس
محورهای موضوعی : یافته های نوین کاربردی و محاسباتی در سیستم های مکانیکی
امیر محمدی نیا
1
(دانشجوی کارشناسی ارشد، گروه مکانیک، واحد دزفول، دانشگاه آزاد اسلامی، دزفول، ایران)
پریزاد شیخی
2
(استادیار، گروه مکانیک، واحد دزفول، دانشگاه آزاد اسلامی، دزفول، ایران)
کلید واژه: کامپوزیت چوب پلاستیک, کنوکارپوس, پلی‌پروپیلن, ویژگی‌های مکانیکی,
چکیده مقاله :
در تحقیق حاضر، امکان ساخت کامپوزیت از پلی‌پروپیلن و آرد چوب کنوکارپوس مورد بررسی قرار گرفته است. کنوکارپوس ارکتوس یک گونه وارداتی است که در استان‌های جنوبی کشور مانند خوزستان کشت شده است و به عنوان یک منبع لیگنوسلولزی، پتانسیل آن تاکنون در ساخت کامپوزیت چوب پلاستیک بررسی نشده است. کامپوزیت‌های حاوی 0 ، 10، 20، 30 و 40 درصد وزنی آرد چوب و 4 درصد وزنی جفت¬کننده انیدرید مالئیک پیوند شده با پلی‌پروپیلن به روش قالب¬گیری تزریقی ساخته شدند. سپس اثر مقدار آرد چوب با نمونه‌های پلی‌پروپیلن خالص مقایسه گردید. بر اساس نتایج، با افزایش نسبت آرد چوب، دانسیته و مقاومت‌های مکانیکی، به جز مقاومت به ضربه، افزایش معنی¬داری نشان دادند، ولیکن بین فرآورده‌های حاوی10 تا 30 درصد وزنی آرد چوب تفاوت آماری معنی‌داری مشاهده نشد. بیشترین دانسیته و مقاومت‌های مکانیکی در فرآورده¬های حاوی 40 درصد وزنی آرد چوب حاصل گردید. مقاومت به ضربه با افزودن 10درصد آرد چوب کاهش چشمگیری داشت و افزایش آرد چوب از 10 تا 40 درصد تاثیر معنی‌داری نداشت. از تصاویر میکروسکوپ الکترونی از سطح شکست نمونه‌ها برای بررسی نحوه توزیع ذرات آرد چوب در ماتریس پلیمر هم استفاده شد. در این تصاویر هم همپوشانی الیاف توسط پلیمر و هم تجمع آرد چوب قابل مشاهده است.
The current research, the possibility of making composite from Conocarpus wood flour-based polypropylene was investigated. Conocarpus erectus is an imported species that has been cultivated in the southern provinces of the country like Khuzestan province, and as a lignocellulosic source has not yet been investigated in making wood-plastic composites. Wood flour-based polypropylene composite with different flour weight fractions (0, 10, 20. 30 and 40%) and constant 4% maleated polypropylene (MAPP) coupling agent have been fabricated using extrusion injection molding process. The effect of wood flour content has been compared with neat polypropylene specimen. Based on the results, with the increment in the proportion of wood flour, the density and mechanical properties showed a significant increase, except for the impact resistance, but no statistically significant difference was observed between the specimens containing 10 to 30% by weight of wood flour. The highest density and mechanical resistances were obtained in the products containing 40% by weight of wood flour. The impact resistance was significantly reduced with the addition of 10% wood flour, and the increase of wood flour from 10 to 40% had no significant effect. Electron microscope images of the fracture surface of the samples were also used to investigate the distribution of wood flour particles in the polymer matrix. In these images, both the overlapping of particles by polymer and the accumulation of wood flour can be seen.
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