مهندسی شیمی ایران

مهندسی شیمی ایران

بررسی ارتباط ریزساختار با خواص مکانیکی، حرارتی و نفوذپذیری نانوکامپوزیت‌های پایه‌سیلیکون حاوی نانوذرات ‌رس اصلاح‌شده

نوع مقاله : مقاله پژوهشی

نویسندگان
1 کارشناس ارشد مهندسی شیمی- پلیمر، دانشگاه اصفهان
2 دانشیار مهندسی پلیمر، دانشگاه اصفهان
3 مربی مهندسی مکانیک، دانشگاه شهید بهشتی
4 پژوهشگر پسادکترا و دستیار تحقیقاتی مهندسی پلیمر، دانشگاه اصفهان
چکیده
استفادهاز کامپوزیت‌ها در صنایع مختلف در دهه‌های اخیر به‌طور چشم‌گیری افزایش‌یافته‌است. در سازه‌های کامپوزیتی تحت بارهای حرارتی و مکانیکی، میکروترک‌ها می‌تواند باعث نشتی و شکست شود. برای جلوگیریاز این مشکل، آب‌بندی سازه‌ها بااستفاده‌از آب‌بندهای پوششی و فیلم‌های پلیمری و الاستومری ضروری است. این مواد دربرابر عبور گاز و شوک‌های حرارتی مقاوم هستند.
در این پژوهش، با افزودن نانورس کلوزیت (Cloisite 5) و اصلاح سطحی آن به‌کمک عامل سیلانی APTES، سعیشدهاست تا خواص نانوکامپوزیت‌های سیلیکونی بهبودیابد. نتایج آزمون‌های TGA، XRD و FTIR نشان‌دهندۀ پیوندخوردگی گروه‌های آمینوسیلانی با گروه‌های هیدروکسیل در کلوزیت با درصد پیوندخوردگی 3/66 بود. همچنین، بررسی ریخت‌شناسی نانوکامپوزیت‌ها نشان‌داد که حضور نانورس‌های اصلاح‌شده منجربه بهبود پراکنش و افزایش خواص مکانیکی می‌شود. نتایج آزمون تخریب گرمایی نشان‌داد که نانوذرات اصلاح‌شده، می‌تواند پایداری گرمایی را افزایشدهد. همچنین، اصلاح سطحی نانورس‌ها به بهبود پخت لاستیک و کاهش تراوایی در نانوکامپوزیت‌های سیلیکونی کمککرده‌است. بررسی نتایج آزمون روبشی- زمان نشان‌داد که اصلاح سطحی نانو رس موجب بهبود بیشتر پخت این لاستیک شده‌است. به‌طور کلی، این پژوهش نشان‌دهندۀ تأثیر مثبت نانورس‌های اصلاح‌شده بر خواص حرارتی و مکانیکی نانوکامپوزیت‌ها است و می‌تواند به بهبود عملکرد آن‌ها در کاربردهای صنعتی کمککند.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Investigation of the Relationship Between Microstructure and Thermal, Mechanical Properties and Diffusivity of Silicone Rubber/Clay Nanocomposites

نویسندگان English

E. Eshghi nejad 1
O. Moini Jazani 2
M. Sohrabian 3
M. H. Karami 4
1 MSc. in Chemical Engineering – Polymer, University of Isfahan
2 Associate Professors of Polymer Engineering, University of Isfahan
3 Instructor of Mechanical Engineering, Shahid Beheshti University
4 Postdoctoral Researcher and Research Assistant of Polymer Engineering, University of Isfahan
چکیده English

The use of composites in various industries had significantly increased in recent decades. In composite structures subjected to thermal and mechanical loads, microcracks could lead to leakage and failure. To prevent this issue, sealing the structures with coating sealants and polymeric and elastomeric films was essential. These materials were resistant to gas permeation and thermal shocks. In this research, the properties of silicone nanocomposites were improved by adding nanoclay (Cloisite 5) and modifying its surface using APTES (silane agent). The results of TGA, XRD, and FTIR tests indicated the bonding of aminosilane groups with hydroxyl groups in Cloisite, with a bonding percentage of 3.66%. Additionally, the morphological analysis of the nanocomposites showed that the presence of modified nanoclays led to improved dispersion and enhanced mechanical properties. Thermal degradation tests revealed that the modified nanoparticles could increase thermal stability. Furthermore, the surface modification of nanoclays contributed to better rubber curing and reduced permeability in silicone nanocomposites. The results of the time-sweep test indicated that the surface modification of nanoclays further improved the curing of this rubber. Overall, this research demonstrated the positive impact of modified nanoclays on the thermal and mechanical properties of nanocomposites, which could enhance their performance in industrial applications.

کلیدواژه‌ها English

Silicone Rubber
Surface Modification
Nanoclay
Nanocomposite
Permeability
Thermal Stability
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