Mechanical characterization of halloysite/thermoset nanocomposites prepared by thiol-epoxy click reaction

Abstract

In this study, thermoset nanocomposites containing pure halloysite (HNT) were prepared by thiol-epoxy click reaction. HNT nanotubes with different concentrations (0, 1, 2, 3 and 5 wt%) were used as nanofiller in a mixture of commercially available monomers trimethylolpropane triglycidyl ether and trimethylolpropane tris(3-mercaptopropionate). The characteristic bands and thermal properties of pure HNT, neat thermoset and HNT/thermoset nanocomposites were investigated by Fourier-transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA), respectively. The distribution of HNT nanotubes in the thermoset matrix was observed by scanning electron microscopy (SEM). The effect of various HNT loadings into the thermoset matrix on the mechanical properties was determined by tensile test. The most improved mechanical properties were detected in the nanocomposite including 3 wt% pure HNT due to the best dispersion of nanofiller and effective interactions between HNT and thermoset matrix. Further increase in the amount of HNTs resulted in agglomeration of nanotubes and hence deterioration of mechanical properties.

Keywords

• Halloysite
• Mechanical properties
• Nanocomposite
• Thermosets
• Thiol-epoxy click chemistry

Tiyol-epoksi click reaksiyonu ile hazırlanan haloysit/termoset nanokompozitlerinin mekanik karakterizasyonu

Abstract

Bu çalışmada, saf haloysit (HNT) içeren termoset nanokompozitler tiyol- epoksi click reaksiyonu ile hazırlanmıştır. Farklı oranlarda (ağırlıkça %0, 1, 2, 3 ve 5) HNT nanotüpleri, ticari olarak hazır monomerler olan trimetilolpropan triglisidil eter ve trimetilolpropan tris(3-merkaptopropiyonat) karışımında nanodolgu olarak kullanılmıştır. Saf HNT, saf termoset ve HNT/termoset nanokompozitlerinin karakteristik bantları Fourier dönüşümlü kızılötesi spektroskopisi (FT-IR), termal özellikleri ise termogravimetrik analiz (TGA) ile incelenmiştir. HNT nanotüplerinin termoset matris içindeki dağılımı taramalı elektron mikroskobu (SEM) ile gözlemlenmiştir. Termoset matrise değişen miktarlarda HNT nanodolgusu eklenmesinin mekanik özellikler üzerindeki etkisi çekme testi ile belirlenmiştir. En gelişmiş mekanik özellikler, HNT ile termoset matris arasındaki etkili etkileşimleri destekleyen en iyi dağılım nedeniyle ağırlıkça %3 saf HNT içeren nanokompozitte tespit edilmiştir. Matrise eklenen HNT’nin daha fazla artması nanotüplerin aglomerasyonuna ve dolayısıyla mekanik özelliklerin bozulmasına neden olmuştur.

Keywords

• haloysit
• mekanik özellikler
• nanokompozit
• termosetler
• tiyol-epoksi click kimyası

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