مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

مطالعه تجربی اثر فرآوری قلیایی بر خواص مکانیکی الیاف نخل خرما و چسبندگی آن با رزین اپوکسی

نوع مقاله : پژوهشی اصیل

نویسندگان
1 دانشکده مهندسی مکانیک،دانشگاه صنعتی خواجه نصیر الدین طوسی
2 پژوهشگاه پلیمر و پتروشیمی ایرانپژوهشکده فرآیند پلیمرها
چکیده
الیاف موجود در قسمت های مختلف نخل خرما، که از گیاهان بومی زیست­اقلیم جنوب ایران است، از انواع الیاف طبیعی به شمار می­روند که می توان از آنها به عنوان تقویت کننده کامپوزیت­های پلیمری بهره جست. در این پژوهش اثر فرآوری قلیایی بر روی خواص مکانیکی الیاف نخل خرما و چسبندگی آن با پلیمر گرماسخت مورد مطالعه تجربی قرار گرفته است. از محلول سدیم هیدروکسید (NaOH) در سه غلظت 1%، 3%، و 5% برای فرآوری قلیایی الیاف استفاده شده است. خواص مکانیکی الیاف بوسیله تست کشش تک لیف و استحکام برشی در فصل مشترک الیاف و ماتریس بوسیله تست Pull-out اندازه گیری شد. بررسی تصاویر SEM سطح الیاف نخل خرما قبل و بعد از فرآوری نشان دهنده بهبود کیفیت سطح الیاف و حذف لایه های لیگنین و واکس پس از فرآوری با غلظت 3% بود. همچنین، فرآوری باعث افزایش معناداری در استحکام کششی، مدول الاستیسیته و کرنش شکست الیاف گردید. نتایج تست Pull-out و بررسی تصاویر SEM سطح الیاف پس از تست نیز نشان دهنده افزایش چسبندگی ماتریس به الیاف بعد از فرآوری بود. بیشترین میزان افزایش در خواص مکانیکی و چسبندگی الیاف و ماتریس در غلظت 3% مشاهده شد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Effect of alkali treatment on the mechanical properties of date palm fibers and their adhesion to epoxy resin

نویسندگان English

Mohammad Ravandi 1
Soheil Dariushi 2
Ahmad Bateni 1
1 Department of Mechanical Engineering, K. N. Toosi University of Technology
2 Iran Polymer and Petrochemical InstitutePolymer processing faculty,
چکیده English

The fibers of date palms, which are widely available in the south of Iran, are a variety of natural fibers that can be used as a reinforcement in polymer composites. This work investigates the effect of alkali treatment on the mechanical properties of date palm fibers and their adhesion to thermoset polymer. The sodium hydroxide (NaOH) solution at three different concentrations (1 wt%, 3 wt%, and 5 wt%) was used to treat the fibers. The single fiber tensile test and fiber pull-out tests were performed to measure the mechanical properties and fiber/matrix interfacial share strength, respectively. Comparing the SEM images of the untreated and treated fibers showed that the 3% NaOH treatment could effectively remove non-cellulosic materials, i.e. lignin and wax, with minimum damage to the fiber surface. The experimental results showed a clear improvement of the mechanical properties and fiber/matrix adhesion after treatment. It was found that the 3% NaOH solution is the optimal concentration to achieve the maximum improvement in the fiber and bonding properties.

کلیدواژه‌ها English

natural fibers
date palm fibers
alkaline treatment
Pull-out test
interfacial shear strength
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