Ahmet YAPICI, Mehmet Okan ERDAL, Lokman GEMİ, Şakir YAZMAN

Örgülü Olmayan Elektrospin PAN Nanofiber Malzemenin Epoksi Kompozitlerin Mekanik ve Termal Özelliklerine Etkisi

Bu çalışmada elektrospin metodu ile üretilmiş farklı sayılardaki nanofiber takviyeli tabakalı epoksi kompozitlerin mekanik ve termal özellikleri araştırılmıştır. Elektrospin işlemi için ağırlıkça %10 oranında poliakrilonitril (PAN) ve N,N dimetilformamid (DMF) çözeltisi kullanılmıştır. Elde edilen nanofiber çapları 380-420 nm aralığındadır. Üretilen nanofiber tabaka kalınlığı ortalama 200 μm’dir. Tabakalı kompozit plakaları elde etmek için özel kalıplar hazırlanmıştır. Çekme deney sonuçları nanofiber tabaka kullanımının çekme kuvvetini saf epoksiye oranla % 34.54 arttırdığı ancak uzamayı saf epoksiye oranla % 8.87 azalttığı belirlenmiştir. Numunelerin kırılma yüzeyleri optik ve taramalı elektron mikroskopu (SEM) ile incelenmiştir. Üretilen nanofiber tabakalı kompozitlerin termal özellikleri termal gravimetrik analiz (TGA) ve diferansiyel taramalı kalorimetre (DSC) analizleri ile belirlenmiştir. Camsı geçiş sıcaklığının PAN tabaka sayısı arttıkça buna paralel olarak arttığı ve 86 C ye kadar çıktığı, termal kararlılıkta ise PAN tabakalarının etkisinin çok fazla olmadığı görülmüştür.

The Effect of Nonwoven Electrospun PAN Nanofiber Mat on Mechanical and Thermal Properties of Epoxy Composites

In this study mechanical and thermal properties of epoxy resin reinforced withdifferent numbers of nanofiber layers which produced with electrospinning method wasinvestigated. Solution of 10 wt% of polyacrylonitrile (PAN) in N,N-dimethylformamide(DMF) was used for electrospinning. The diameters of the obtained nanofibers were in therange of 380-420 nm. The average thickness of the produced nanofiber layer was about200 μm. The special molds were prepared to produce the laminated composite plates. Thetensile tests show that the using of nanofiber PAN layers increase the tensile force 34.54%and decrease the elongation 8.87% in comparison with neat epoxy. The fracture surfaces ofthe specimens were inspected by using optical and scanning electron microscopy (SEM).The thermal properties of the nanofiber layered composites were determined by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) analysis. It wasobserved that the glass transition temperature increased parallel to this as the number ofPAN layers increased and rose up to 86ᵒC, while the thermal stability did not show mucheffect of PAN layers.

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