Stereolitrografi ile 3B Basılabilir Nanokil Takviyeli Polimer Yapıların Mekanik Karakterizasyonu

Abstract

3-Boyutlu (3B) basılabilir polimerik yapılar, mevcut geleneksel yöntemlerle üretilen parçalardan daha düşük mekanik özelliklere sahiptir. UV-ışınları ve devamında uygulanan ısıl işlem adımları sırasında polimer zincirleri arasında reçine çapraz bağlanmasına rağmen, 3B polimerik yapılar üzerinde yüksek uzama ve daha fazla süneklik arzu edilen seviyelerde değildir. Son yıllarda silika, alümina, zirkonya ve çok duvarlı karbon nanotüp, grafen vb. gibi takviye malzemeleri mekanik özellikleri geliştirmek için örnek çalışmalar olmuşlardır. Bu çalışmada, fotoduyarlı reçinede yüksek dispersiyon ve homojenlik sağlayan amin ve silan fonksiyonel grubu içeren montmorillonit nanokiller, dört farklı (katkısız, %0.25, %0.5 ve %1) konsantrasyonda hazırlanmıştır. 3B lazer stereolitografi yazıcı kullanılarak test numuneleri (çekme testi, dinamik mekanik analiz (DMA) ve taramalı elektron mikroskobu (SEM)) basılmıştır. Sonuç olarak, nanokil konsantrasyonunu arttırarak, polimerik yapılar mekanik dayanımının katkısız polimer yapılara nazaran arttığı görülmektedir. Sadece %1 nanokil konsantrasyonda nanokiller arasında görülen topaklaşma nedeni ile %0.5 nanokil ilavesine kıyasla mekanik dayanımın daha düşük çıktığı gözlemlenmiştir. Ayrıca nanokilin yalıtkan özelliğinden dolayı termal stabilitenin nanokil ilavesi ile beraber kademeli olarak azaldığı da görülmüştür.

Keywords

• Nanokil,Stereolitrografi,Dinamik Mekanik Analiz,Çekme Dayanımı,Fotoduyarlı Reçine

Mechanical Characterization of 3D Printable Nanoclay Reinforced Polymer Structures by Stereolithography

Abstract

3-Dimensional (3D) printable polymeric structures have lower mechanical properties than parts produced by existing conventional methods. It is still a challenge to obtain high elongation and more ductile on 3D polymeric structures even though photocurable resin cross linked with among polymer chains during UV-irridation and applied post-heat treatment steps. Filler materials as reinforcement agents such as silica, alumina, zirconia and multi-walled carbon nanotube, graphene, etc. were used to enhance its mechanical properties in the past decades. In this study, montmorillonite nanoclays including amine and silane functional group, which provides high dispersibility and homogeneity in photocurable resin, are added and mixed into acyrlate based photocurable resin with four different (pure, 0.25%, 0.5% and 1%) concentration. By using a 3D laser stereolithography printer, test samples are produced and characterized by tensile test, dynamic mechanical analyzer (DMA) and scanning electron microscope (SEM). As a result, it has been observed that by increasing the concentration of nanoclay, 3D polymeric structures gradually enhances its mechanical strength compared to pure polymer structures. Due to the agglomeration observed on %1 nanoclay concentration, their mechanical strength is lower than that of 0.5% nanoclay. Also, thermal stability gradually decreases with increasing nanoclay concentration due to its insulating properties.

Keywords

• Nanoclay,Stereolithography,Dynamic Mechanical Analysis,Tensile Strength,Photocurable Resin

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