Effect of Micro and Nano TiO2 on UV Degradation behavior of TiO2 Reinforced Polycaprolactone Composites

Croatica Chemica Acta

Grozdanić, Vedrana¹  Filipan, Veljko²  Govorčin Bajsić, Emi²  Grgurić Holjevac, Tamara³ 

[1] Research Center for Materials of Region of Istria METRIS, Zagrebačka 30, 52100 Pula, Croatia;University of Zagreb, Faculty of Chemical Engineering and Technology, Marulićev trg 19, HR-10000 Zagreb, Croatia;University of Zagreb, Faculty of Metallurgy, Aleja narodnih heroja 3, HR-44103 Sisak, Croatia

关键词: particle-reinforced composites;    nanocomposites;    thermal properties;    thermomechanical properties;    UV radiation;   

DOI  :  10.5562/cca3141

学科分类：化学（综合）

来源: Croatica Chemica Acta

【 摘 要 】

In this work the influence of micro and nano titanium dioxide (TiO2) particles on the properties of polycaprolactone (PCL) based composites before and after UV radiation was investigated. The neat PCL and PCL / TiO2 micro and nanocomposites were radiated for 120 and 240h. DSC analysis showed that the melting temperature (Tm) decreased while the crystallization temperature (Tc) and degree of crystallinity (χc) increased when the composites were exposed to UV radiation. DMA analysis showed that the glass transition temperature (Tg) increased after UV irradiation. The addition of fillers leads to an increase in the initial weight loss (5 wt %) which decreases by time of exposing the samples to UV radiation. SEM showed that the addition of micro and nano TiO2 promote UV degradation of polymer matrix after 120 and 240 h degradation. The results of FTIR spectroscopy confirmed that the micro and nano TiO2 enhance the degradation process because of their photocatalytic activity. The PCL / TiO2 microcomposites showed higher changes in all investigated properties after UV radiation compared to the PCL / TiO2 nanocomposites.

【 授权许可】

CC BY