علوم و فناوری کامپوزیت

بهبود مقاومت تورق کامپوزیت‌های شیشه-فنولی به روش چقرمه‌سازی زمینه توسط پلی‌وینیل بوتیرال

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، مهندسی پلیمر، پژوهشگاه پلیمر و پتروشیمی ایران، تهران، ایران

2 عضو هیات علمی پژوهشگاه پلیمر

3 استاد،پژوهشکده فرایند، پژوهشگاه پلیمر و پتروشیمی ایران، تهران

چکیده

کامپوزیت‌ها انواع مختلف دارند که از جمله آن‌هاکامپوزیت‌ها با ساختار لایه‌ای می‌باشند که در آنها احتمال تورق تحت بار‌های اعمالی وجود دارد. کامپوزیت رزین فنولیک / الیاف شیشه از جمله کامپوزیت‌های پر کاربرد می‌باشد که احتمال تورق در آن زیاد است. در این پژوهش افزایش مقاومت این کامپوزیت در برابر تورق با کمک افزودنی‌ پلیمری گرمانرم پلی وینیل بوتیرال (PVB) با مقادیر 1، 3، 5، 10 و phr 20 مورد بررسی قرار گرفته است. ابتدا پیش آغشته الیاف شیشه و رزین فنولی اصلاح شده تهیه شده، به منظور رسیدن به پخت جزئی ، در شرایط دما-زمان معین قرار داده و میزان جریان یابی آن‌ها اندازه‌گیری شد. سپس با فرآیند قالب‌گیری فشاری از نمونه‌های با مقدار جریان‌یابی یکسان %10، نمونه‌های آزمون خمش تهیه شد. نتایج آزمون خمش سه نقطه‌ای نشان دادکه افزودن PVB در مقادیر مختلف موجب بهبود نسبی استحکام و مقاومت در برابر تورق شده که میزان آن تابع مقدار افزودنی است. افزودن PVB تا phr 3 موجب افزایش چقرمگی شکست تا %2/58 و بیشتر از phr 3 موجب کاهش آن شده، متوسط نیروی پیش برنده شکست نیز تنها در کامپوزیت حاوی phr 3 از PVB افزایش یافت. در این راستا میزان phr 3 از PVB به عنوان مقدار بهینه شناخته شد. بررسی مورفولوژی سطوح شکست با استفاده از SEM بیانگر ممانعت از رشد ترک در این کامپوزیت‌‌ها حتی در مقدار phr 1 می‌باشند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Improvement of delamination resistance of glass-phenolic composites through matrix toughening mechanism using poly (vinyl butyral)

نویسندگان [English]

  • Mahya Faraji 1
  • Masoud Esfandeh 3

1 Composites Department, Iran Polymer & Petrochemical Institute, Tehran, Iran

2

3 Composites Dept, Process Faculty, Iran Polymer & Petrochemical Institute, Tehran, Iran

چکیده [English]

There are various types of composites among which these with layered structure are susceptible to delamination under the applied loads. Phenolic resin/glass fiber composites, one of the most commonly used composites, are prone to delamination. In this research, the improvement of the delamination resistance of phenolic composites via the addition of polyvinyl butyral (PVB), a thermoplastic additive at various contents (i.e. 1, 3, 5, 10 and 20 phr) has been studied. For this purpose a phenolic/glass fiber prepreg modified with thermoplastic additive was prepared and brought to a partially cured (B-stage) by using a specified temperature-time condition. The flow ability of the prepared prepregs was measured. Samples for the flexural test were then prepared by compression molding of the prepregs having the flow abilities of 10%. Three-point bending test results showed that the addition of PVB relatively improves the strength and delamination resistance of the composites, the extent of which depends on the additive content. The addition of PVB at 3 phr increased the fracture toughness up to 58.2%, however beyond which it was reduced; hence 3phr was regarded as the optimum value. Inspection of the fracture surface morphology by SEM revealed the inhibition of crack propagation even at 1 phr of PVB.

کلیدواژه‌ها [English]

  • Glass-phenolic Composites
  • Delamination
  • Polyvinyl Butyral
  • Toughening
  • Flexural Strength
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علوم و فناوری کامپوزیت
دوره 5، شماره 4
اسفند 1397
صفحه 521-528
فایل ها
هم رسانی
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