تأثیر تقویت‌کنندگی نانوسیلیس بر خواص مکانیکی و حرارتی چندسازه‌های آرد چوب کاج و پلی‌پروپیلن بازیافتی

نوع مقاله : مقاله علمی

نویسندگان
جعفر ابراهیم پور کاسمانی 1
احمد ثمریها 2
1 دانشیار، گروه چوب و کاغذ، واحد سوادکوه، دانشگاه آزاد اسلامی، سوادکوه، ایران
2 استادیار، گروه علوم مهندسی، دانشگاه ملی مهارت، تهران، ایران
10.22034/stme.2025.543980.1163
چکیده
این تحقیق با هدف بررسی تأثیر نانوسیلیس بر خواص مکانیکی و حرارتی چندسازه حاصل از آرد چوب کاج و پلی‌پروپیلن ضایعاتی انجام شد. برای این منظور، ترکیبی از پلی‌پروپیلن (در سطح ثابت 50 درصد) و آرد چوب کاج (در سطح ثابت 50 درصد) به همراه نانوسیلیس در چهار سطح (0، 3، 6 و 9 درصد) و انیدرید مالئیک پیوند داده‌شده با پلی‌پروپیلن (در سطح ثابت 3 درصد) به‌وسیله اکسترودر دو ماردونی مخلوط شدند. نمونه‌های آزمایشی استاندارد با استفاده از روش قالب‌گیری تزریقی تهیه گردید. خواص مکانیکی شامل مقاومت کششی و خمشی، مدول کششی و خمشی و مقاومت به ضربه فاق‌دار و همچنین خواص حرارتی و آتش‌گیری نمونه‌ها اندازه‌گیری و ارزیابی شدند. نتایج نشان داد که با افزایش نانوسیلیس تا سطح 9 درصد، مقاومت و مدول کششی به ترتیب 98/12 و 16/5 درصد کاهش یافت. همچنین، مقاومت و مدول خمشی و مقاومت به ضربه فاق‌دار نیز به ترتیب 1/6، 02/5 و 92/10 درصد کاهش نشان دادند. علاوه بر این، با افزایش نانوسیلیس تا سطح 9 درصد، شاخص اکسیژن محدود 4/12 درصد افزایش یافت که نشان‌دهنده بهبود مقاومت حرارتی است. همچنین، میزان خاکستر باقیمانده و ثبات حرارتی نیز با افزایش میزان نانوسیلیس افزایش یافت. این نتایج حاکی از تأثیر مثبت نانوسیلیس بر ویژگی‌های حرارتی و مکانیکی چندسازه‌های ساخته‌شده از آرد چوب کاج و پلی‌پروپیلن ضایعاتی است و می‌تواند به بهبود عملکرد این مواد در کاربردهای مختلف کمک کند. در نمونه‌های حاوی 3 درصد نانوسیلیس، فضاهای خالی کمتری مشاهده شد که نشان‌دهنده اتصال خوب الیاف با ماتریس و جلوگیری از جدایی آن‌ها در زمان شکست است.
کلیدواژه‌ها
آرد چوب کاج
پلی‌پروپیلن بازیافتی
مقاومت خمشی
مدول خمشی
نانو سیلیس
خاکستر باقیمانده
موضوعات

عنوان مقاله English

Reinforcement Effect of Nanosilica on the Mechanical and Thermal Performance of Pine Wood Flour/Recycled Polypropylene Hybrid Composites

نویسندگان English

Jafar Ebrahimpour-Kasmani 1
Ahmad Samariha 2
1 Associate professor, Department of Wood and Paper, Sava.C., Islamic Azad University, Savadkooh, Iran
2 1. Associate professor, Department of Wood and Paper, Sava.C., Islamic Azad University, Savadkooh, Iran 2. Assistant professor, Department of Engineering Sciences, Technical and Vocational University (TVU), Tehran, Iran
چکیده English

This study examines the influence of nanosilica incorporation on the mechanical and thermal performance of hybrid biocomposites composed of pine wood flour and recycled polypropylene. Composite formulations containing 50 wt% polypropylene, 50 wt% pine wood flour, nanosilica at four loadings (0, 3, 6, and 9 wt%), and 3 wt% maleic anhydride grafted polypropylene were compounded using a twin-screw extruder. Standardized test specimens were subsequently manufactured by injection molding. Mechanical properties—tensile and flexural strength and modulus, as well as notched Izod impact strength —alongside thermal behavior and flammability characteristics were evaluated. Increasing nanosilica content to 9 wt% resulted in reductions of 12.98% and 5.16% in tensile strength and tensile modulus, respectively. Flexural strength, flexural modulus, and notched impact strength also declined by 6.1%, 5.02%, and 10.92%, respectively. Conversely, the limiting oxygen index exhibited a 12.4% increase at the highest nanosilica loading, accompanied by higher residual char and improved thermal stability. Morphological analyses further showed fewer interfacial voids in specimens containing 3 wt% nanosilica, indicating superior fiber–matrix adhesion and reduced fiber pullout. Overall, nanosilica demonstrated a favorable contribution to the thermal performance of the composites, though excessive loading adversely affected mechanical properties due to nanoparticle agglomeration. The findings highlight the importance of optimizing nanosilica content to achieve a balanced enhancement of mechanical and thermal functionalities in bio-based polymer composites.

کلیدواژه‌ها English

Pine wood flour؛ recycled polypropylene؛ flexural strength؛ flexural modulus؛ nanosilica
Residual Char

اصل مقاله

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  • تاریخ دریافت 07 شهریور 1404
  • تاریخ بازنگری 11 آبان 1404
  • تاریخ پذیرش 01 آذر 1404
  • تاریخ اولین انتشار 01 آذر 1404
  • تاریخ انتشار 01 بهمن 1404